Server sometimes slow

ok, the KVM spawns two more threads after a while.

this can be seen in iotop.

when i shutdown the vm snd start it up again, it will run smoothly for about 15-30 minutes.

Then these thread reappear!

I can't see much i/o load in dne Windows XP VM itself with the task manager.
the problem has to be elsewhere.
 
Sharon,

1. What instructions did you use to load the previous Kernel?

2. Did you load each of the previous kernel versions to test?

3. Are you still experiencing occasional high loads?
 
its charon...
1)use the grub manpage to see how you manage kernel boots
2) i changed the grub conf to use "pve-kernel-2.6.24-7-pve"
The server is in use atm, so i could not play around with other kernel stuff.
3)yes, i will start testing plain CentOS 5.4 installations with KVM
 
Here are my results after downgrading the kernels.

This is yesterday running with pve-kernel-2.6.24-7-pve_2.6.24-11_amd64.deb for the first 3 hours until 3:27am where you see the "linux restart line. Then running with pve-kernel-2.6.24-7-pve_2.6.24-8_amd64.deb

HTML: 
myhost:~# sar -P

Linux  myhost  2.6.24-7-pve  #1 SMP PREEMPT Fri Aug 21 09:07:39 CEST 2009  x86_64  10/31/2009

00:30:01  pswch/s runq nrproc lavg1 lavg5 avg15                      _procload_
00:40:01     1374    6   1039  1.31  1.74  1.90
00:50:01     1636    7   1046  1.19  1.13  1.47
01:00:01     1489    6   1084  1.65  1.36  1.36
01:10:01     1088    6   1056  0.80  1.07  1.23
01:20:01     1108    8   1069  1.42  1.65  1.43
01:30:01      957    6   1072  0.79  1.11  1.27
01:40:01     1274    8   1085  2.07  1.61  1.37
01:50:02     1225   23   1131 19.84 10.95  5.34
02:00:01     3979    8   1073  3.24  8.71  7.18
02:10:01    10831   25   1129  6.52 11.24  8.96
02:20:01     2043    9   1088  1.43  2.97  5.50
02:30:01     1676    6   1081  0.11  0.87  3.24
02:40:01      891    8   1086  0.25  0.27  1.76
02:50:01      896    7   1092  0.08  0.14  0.97
03:00:01      732    9   1089  0.03  0.08  0.54
03:10:01      638    8   1081  0.05  0.04  0.28
03:20:01      555   10   1123 15.00  7.36  2.99
03:27:25     linux restarts
03:30:01     3553    1   1114  2.55  3.31  1.50
03:40:01      988    7   1047  0.59  0.87  1.02
03:50:01     1067    4   1046  1.75  1.18  1.01
04:00:01     1187    9   1059  2.72  1.89  1.44
04:10:01     1063    8   1058  1.06  1.51  1.50
04:20:01      974   10   1071  0.37  0.57  0.97
04:30:01      840   54   1179 23.88 15.64  7.18
04:40:01     2488    8   1091  1.36  3.36  4.52
04:50:04      889   54   1133 14.65  5.79  4.44
05:00:01     3282   13   1131  1.24  3.85  4.85
05:10:01     1936   42   1123 14.45  5.51  4.49
05:20:01     1432    7   1093  1.19  3.88  5.09
05:30:01     1409   24   1123 13.47 16.06 10.21
05:40:01     1233    6   1093  1.61  3.59  6.08
05:50:01     1690   11   1093 32.82 20.38 11.70
06:00:01     1494    7   1067  0.85  3.74  6.70
06:10:01      799    5   1062  1.91  8.51  8.68
06:20:01     1077    6   1060  0.94  2.00  5.00
06:30:01     1254    9   1076  2.86  2.20  3.51
06:40:01     1077    9   1094  1.81 11.98  9.84
06:50:01     1019   10   1098  0.72  2.29  5.53
07:00:01      853    7   1113  1.33  1.35  3.43
07:10:09     1369   57   1163 17.85  5.40  3.70
07:20:01     2027    7   1116  1.38  7.42  8.23
07:30:01     1469    7   1125  2.34  2.20  4.89
07:40:01     1209    9   1076  1.21  1.57  3.25
07:50:01      747   45   1154 20.05  8.92  5.04
08:00:01     1945    7   1070  1.27  3.80  4.91
08:10:01     2061   12   1120 21.09 19.36 11.33
08:20:01     2702    6   1104  1.02  3.47  6.39
08:30:01     3882   10   1116  1.62  1.93  4.12
08:40:01     1295    4   1091  1.13  1.38  2.80
08:50:01     1443    8   1118  1.71  1.45  2.12
09:00:01     3167    7   1100  3.69 11.06  8.23
09:10:01     5788   22   1163 28.82 20.24 12.49
09:20:01     2208    8   1095  2.84  5.05  7.99
09:30:01     1520   29   1176 11.21 13.68 11.03
09:40:01     3168   14   1132  2.87  8.45 11.21
09:50:01     1985   11   1124  2.10  2.68  6.72
10:00:01     1881   11   1140  2.46  2.29  4.58
10:10:01     3357   13   1145  3.25  8.03  7.52
10:20:01     6239   35   1157 24.67 16.10 11.73
10:30:01     2255    7   1078  2.55  5.05  8.13
10:40:01     2067    6   1239  1.07  1.65  4.80
10:50:01     3705    8   1132  2.73  9.15  8.87
11:00:01     1978   17   1173  2.23  3.30  5.86
11:10:01     1614    5   1125  2.29  6.79  7.89
11:20:01     1951    8   1122  2.42  2.56  5.01
11:30:01     2032   44   1169  5.11  3.41  4.08
11:40:01     4947    9   1105  2.43  5.66  6.33
11:50:02     2375   29   1146 24.95 13.29  8.44
12:00:01     3055   15   1123 18.81 21.80 15.19
12:10:02     2224   30   1172 28.07 13.57 12.07
12:20:01     4927   34   1154 35.43 19.87 14.75
12:30:01     1948   45   1192 13.53 17.65 16.92
12:40:01     5892    8   1117  2.05  7.07 12.94
12:50:01     4744   11   1112  4.78 14.16 14.65
13:00:01     1860   18   1112  2.17  3.69  8.62
13:10:01     1441    4   1116  1.41  7.18 10.02
13:20:01     1099    9   1126  1.22  1.97  5.79
13:30:01     1605   13   1144  1.01  1.45  3.72
13:40:01     2776   16   1099  2.27  5.93  5.33
13:50:01     2096    7   1121  1.92  7.68  7.63
14:00:01     1975   29   1131 12.39 11.90  9.27
14:10:02     1357   38   1189  7.30  4.93  6.27
14:15:23     linux restarts


This is today running on pve-kernel-2.6.24-5-pve_2.6.24-6_amd64.deb
HTML: 
myhost:~# sar -P

Linux  myhost  2.6.24-5-pve  #1 SMP PREEMPT Tue May 12 09:01:17 CEST 2009  x86_64  11/01/2009

00:00:01  pswch/s runq nrproc lavg1 lavg5 avg15                      _procload_
00:10:01     3058    6   1078  3.31  7.53  7.92
00:20:01     4021   10   1117  7.54 11.09 10.10
00:30:01     5291    7   1103  3.81  4.53  6.92
00:40:01     5267   20   1134  5.85  6.71  6.66
00:50:01     5313    8   1116  3.54  7.40  7.79
01:00:01     4489   21   1109  3.36  3.67  5.45
01:10:01     5161    8   1100  7.28 15.63 11.22
01:20:01     2786   26   1120 24.11 13.69 10.61
01:30:01     4923    5   1082 22.33 27.77 20.99
01:40:01     4439    4   1102  1.78 10.65 17.06
01:50:01     6978    6   1094 14.68 18.61 17.20
01:00:01     4658    8   1091  1.65 11.27 16.41
01:10:01     4320    6   1096  3.35  8.89 13.27
01:20:01     3830   22   1114  3.04 13.84 15.44
01:30:01     5374   17   1133  2.69 11.14 14.49
01:40:01     4087    6   1113  5.20  5.28  9.34
01:50:01     4249    8   1083  2.31  7.73 10.22
02:00:03     3068   10   1174  1.97  2.83  6.36
02:10:07    11951   40   1159 17.34 11.78  8.67
02:20:01     3655   13   1120  1.97  3.49  5.70
02:30:03     3496   14   1094 11.55 13.93  9.64
02:40:01     5403   12   1106  3.92 15.00 13.44
02:50:03     6225    8   1121 22.42 14.99 12.41
03:00:01     2012    5   1096  1.89  6.99 10.71
03:10:01     2580    8   1152  2.01 10.56 13.11
03:20:09     3316   17   1138 31.29 22.41 16.49
03:30:01     4593    7   1100  6.20  7.89 11.21
03:40:01     2506    9   1122  1.19  3.39  7.74
03:50:01     1808    7   1130  3.01  2.68  5.11
04:00:01     2839    5   1135  3.06  2.08  3.53
04:10:01     5332   19   1108 24.14 16.12  9.36
04:20:01    10204   12   1136  1.64  4.76  6.80
04:30:01     3729    6   1084  0.90  2.37  4.63
04:40:01     1783    4   1102  1.94  5.95  5.95
04:50:01     1903    6   1089  3.49  9.46  8.06
05:00:01     1325    5   1080  0.95  2.18  4.66
05:10:01      828    6   1080  0.73  0.94  2.77
05:20:01      952    9   1100  0.86  0.77  1.82
05:30:01      601   12   1100  1.44  7.12  5.43
05:40:01      825    5   1086  0.76  1.84  3.33
05:50:01      918    8   1087  1.08  1.08  2.17
06:00:01      972    6   1096  0.54  0.83  1.51
06:10:01      901    7   1097  0.83  1.16  1.39
06:20:01      845    8   1107  1.20  0.94  1.11
06:30:01      777   48   1141 43.84 23.89 10.44
06:40:09     1336   22   1171 24.06 15.98 10.86
06:50:01     2330    8   1108  4.51 10.99 10.87
07:00:01      868   15   1115  1.61  3.16  6.62
07:10:01      860    3   1123  0.20  0.92  3.86
07:20:01      857    6   1123  1.29  0.92  2.37
07:30:02     1033   17   1163  4.12  2.42  2.29
07:40:01     1437    9   1090  2.49  2.90  2.63
07:50:01     2251   12   1106  3.73  9.04  7.35
08:00:01     4578   26   1131  2.87 13.75 11.92
08:10:01     2113    3   1088  0.75  2.70  6.75
08:20:01     1244    4   1094  1.04  1.27  4.03


You tell me if this data seem ok. Because for me I still see spikes... It is also worth mentioning that vzdump was running backup from midnight until about 4:25 am but that should not matter.
 
As I continue analyzing what is going on on the server, here is a strange piece of stats.

If you look at the samples for 7:40am and 7:50am, you notice that the server load was very high (14.64 and 20.57), but the CPU were over 90% idle. How can we explain this?

I am starting to believe that something between the kernel and proxmox might not be playing well with the intel nehalem system. Could it be a driver issue as Dietmar suggested sometime earlier?

the command sar -P gives me the following last 5 samples:

HTML: 
00:00:01  pswch/s runq nrproc lavg1 lavg5 avg15     _procload_

07:30:01      957    6   1041  0.74  0.54  0.69
07:40:01     1016   12   1079 14.64 14.79  7.35
07:50:01     2058   13   1055 20.57 17.94 11.19
08:00:01     1241    7   1034  0.37  2.73  6.04
08:10:01      968    3   1035  0.19  0.62  3.30

the command sar gives me the following last 5 samples:

HTML: 
00:00:01  cpu %usr %nice   %sys %irq %softirq    %wait %idle      _cpu_
07:30:01  all    3     0      0    0        0        0    96
            0    5     0      0    0        0        0    94
            1    2     0      0    0        0        0    98
            2    2     0      0    0        0        0    98
            3    2     0      0    0        0        0    97
            4    1     0      0    0        0        0    98
            5    1     0      0    0        0        0    99
            6    0     0      0    0        0        0   100
            7    0     0      0    0        0        0   100
            8    2     0      0    0        0        0    98
            9    1     0      0    0        0        0    99
           10    3     0      0    0        0        0    97
           11    9     0      1    0        0        0    90
           12    7     0      1    0        0        0    93
           13   11     0      1    0        0        0    88
           14    3     0      0    0        0        0    97
           15    1     0      0    0        0        0    99
07:40:01  all    3     0      1    0        0        0    97
            0    6     0      1    0        0        0    93
            1    1     0      1    0        0        0    98
            2    3     0      1    0        0        0    96
            3    1     0      0    0        0        0    98
            4    3     0      1    0        0        0    96
            5    2     0      0    0        0        0    98
            6    1     0      0    0        0        0    98
            7    0     0      0    0        0        0    99
            8    2     0      1    0        0        0    97
            9    1     0      1    0        0        0    99
           10    3     0      1    0        0        0    97
           11    5     0      1    0        0        0    94
           12    5     0      1    0        0        0    94
           13    5     0      1    0        0        0    94
           14    1     0      1    0        0        0    98
           15    0     0      0    0        0        0    99
07:50:01  all    3     0      1    0        0        0    96
            0    6     0      1    0        0        0    93
            1    0     0      1    0        0        0    99
            2    3     0      1    0        0        0    96
            3    1     0      1    0        0        0    98
            4    2     0      1    0        0        0    97
            5    1     0      1    0        0        0    98
            6    2     0      1    0        0        0    97
            7    0     0      1    0        0        0    99
            8    3     0      1    0        0        0    96
            9    1     0      0    0        0        0    98
           10    3     0      1    0        0        0    96
           11    7     0      1    0        0        0    92
           12    6     0      1    0        0        0    94
           13    7     0      1    0        0        0    92
           14    3     0      1    0        0        0    96
           15    2     0      1    0        0        0    97
08:00:01  all    2     0      0    0        0        0    97
            0    4     0      0    0        0        0    95
            1    1     0      0    0        0        0    99
            2    1     0      0    0        0        0    99
            3    3     0      0    0        0        0    97
            4    1     0      0    0        0        0    99
            5    1     0      0    0        0        0    99
            6    1     0      0    0        0        0    99
            7    1     0      0    0        0        0    99
            8    2     0      0    0        0        0    98
            9    2     0      0    0        0        0    98
           10    2     0      0    0        0        0    97
           11    6     0      1    0        0        0    93
           12    4     0      1    0        0        0    95
           13    8     0      1    0        0        0    92
           14    2     0      0    0        0        0    97
           15    2     0      0    0        0        0    98
08:10:01  all    2     0      0    0        0        0    98
            0    3     0      2    0        0        0    95
            1    2     0      1    0        0        0    97
            2    1     0      0    0        0        0    99
            3    1     0      0    0        0        0    99
            4    1     0      0    0        0        0    99
            5    0     0      0    0        0        0   100
            6    0     0      0    0        0        0   100
            7    1     0      0    0        0        0    99
            8    1     0      0    0        0        0    98
            9    1     0      0    0        0        0    99
           10    2     0      0    0        0        0    98
           11    7     0      1    0        0        0    93
           12    4     0      0    0        0        0    96
           13    4     0      1    0        0        0    95
           14    1     0      0    0        0        0    99
           15    1     0      0    0        0        0    98
 
hisaltesse said:
As I continue analyzing what is going on on the server, here is a strange piece of stats.

If you look at the samples for 7:40am and 7:50am, you notice that the server load was very high (14.64 and 20.57), but the CPU were over 90% idle. How can we explain this?
Click to expand...

"load average" comes not only from CPU, but also IO: disk and network traffic.

So if more processes are hammering your disk at the same time, load average will go high, even if the CPU is idle.
 
mangoo said:
"load average" comes not only from CPU, but also IO: disk and network traffic.

So if more processes are hammering your disk at the same time, load average will go high, even if the CPU is idle.
Click to expand...

Good point. However we are running a hardware raid card (adaptec 5405z) which under no load gives around 500MB/s bandwidth. And we only have about 10 openvz vps on this server.

Update: It is also worth mentioning that the server on overage is on very low load. The load spikes approximately one or twice every hour.

Can someone confirm if this behavior is normal?
 
Last edited:
hisaltesse said:
Good point. However we are running a hardware raid card (adaptec 5405z) which under no load gives around 500MB/s bandwidth. And we only have about 10 openvz vps on this server.
Click to expand...

A fast raid read performances does not help if your VMs do many fsync.
 
hisaltesse said:
Good point. However we are running a hardware raid card (adaptec 5405z) which under no load gives around 500MB/s bandwidth. And we only have about 10 openvz vps on this server.
Click to expand...

Are these SSD drives? If not, than these figures are only valid for single linear read.

With multiple processes accessing different parts of the disk, disk heads will start to seek, and your performance will drop significantly.


How do you have your guest images stored? In LVM files, or in normal files on a ext3 filesystem? If it's files on the filesystem which were not pre-allocated beforehand, it could be that they are very fragmented (especially if you began with "elastic" qcow2 files which grow on the host as the guest disk usage grows).
 
dietmar said:
A fast raid read performances does not help if your VMs do many fsync.
Click to expand...

OK Dietmar, is there any reason why the openvz servers would do excessive fsync? If so what can be done to reduce it?

Would you think that the performance would be the same if one were to run openvz straight from the guess host vs through proxmox? What is the technical difference?

We only run openvz
 
hisaltesse said:
OK Dietmar, is there any reason why the openvz servers would do excessive fsync? If so what can be done to reduce it?
Click to expand...

You have to find what causes it. Read: what processes read or write a lot.

Run htop, iotop, atop etc. Write some scripts (i.e. ps aux saved every 30 secs; then compare it with sar output where the load happened etc.).

With some luck, you will be able to find something.
 
hisaltesse said:
OK Dietmar, is there any reason why the openvz servers would do excessive fsync?
Click to expand...

You run the container, so you need to find out yourself. Most likely a database application (mysql)? But I told you that already one week ago.
 
dietmar said:
You run the container, so you need to find out yourself. Most likely a database application (mysql)? But I told you that already one week ago.
Click to expand...

Dietmar I already confirmed as well that the mysql seems to be the one pushing the load high. What I do not understand is why does this end up in spikes?

If the general load is small that means that the vpss are not that demanding.

1. Why would mysql sometimes create spikes?

2. And is there something that we can do to prevent it from happening or is there something that needs to be done in order to optimize mysql so it does not create this kind of load

3. Or could this be a compatibility issue between the software, kernel and hardware?

So assuming that mysql is the guilty one here, how do we address this issue? Or are you saying that this is a normal behavior when running mysql based vps?
 
Re: Server sometimes slow - Xeon 5520 vs Xeon 5472

Between 9:10am and 9:30am this morning I backuped up and restored two active openvz vps from the nehalem 5520 (new host) to xeon 5472 (old host) which is the previous host we were using.

One of the two containers is one of the heaviest of all the 10. The new host still has about 8 vps and the old one has 2 now.

Here are the load history. the spikes around 9:20 can be disregarded as that was the time on they were being restored on the old host.

The conclusion is:
1. either the old host is ok because there are too few containers on it,
2. or there is a clear problem with the nehalem system as the load on the old host does not spike nearly as much as the new host.

NEW HOST (proxmox 1.4) (notice load spikes even after 9:30am through the day)
HTML: 
Linux  newhost  2.6.24-8-pve  #1 SMP PREEMPT Fri Oct 16 11:17:55 CEST 2009  x86_64  11/06/2009

00:00:01  pswch/s runq nrproc lavg1 lavg5 avg15          _procload_
08:40:01     1245   39   1085  4.83  1.78  1.42
08:50:01     1153   30   1118 37.68 25.62 14.00
09:00:01     3054   40   1126 21.69 12.29 12.49
09:10:01     4898    5   1094  3.12 23.08 25.07
09:20:01     2741    9   1079  1.63  4.58 13.97
09:30:01     1117   23   1003  0.84  4.83 10.13
09:40:01      986    8    967  0.37  0.97  5.47
09:50:01      930    4    955  0.29  0.47  3.05
10:00:01      999   10    968  0.71  0.57  1.86
10:10:01      851    3    967  0.24  0.30  1.09
10:20:01     1074    5    899  4.89  3.04  1.78
10:30:01      878    8    976  0.18  0.71  1.10
10:40:01      886    9    975  0.52  0.46  0.76
10:50:01      817    5    966  0.49  0.38  0.55
11:00:01      733   11    998  0.25  0.23  0.37
11:10:01      799    6    989  0.27  0.35  0.38
11:20:01      783    4    986  0.24  0.31  0.34
11:30:01     2322   22   1010  7.69 12.27  6.32
11:40:01      707    7    970  0.65  1.91  3.42
11:50:01      706    8    980  0.23  0.44  1.86
12:00:01     2776    9    984  2.83  9.81  6.61
12:10:01     2767    6    975  0.55  1.63  3.59
12:20:01     1115    6    987  0.69  0.79  2.17
12:30:01      964    9    989  1.08  0.65  1.39
12:40:01      802    7    987  0.66  0.53  0.93
12:50:01      997    8    993  0.37  0.54  0.74
13:00:01      955   13   1006  3.52 16.69 10.46
13:10:01     1055    5    968  4.42 13.33 11.53
13:20:01     1223    7    970  0.60  2.26  6.27
13:30:01      975    9    978  0.35  0.56  3.41
13:40:01      779    6    968  0.12  0.22  1.86
13:50:03      926   60   1061 52.10 28.12 14.00
14:00:01     2448   13   1019  0.57  4.40  7.76
14:10:01      950    7    999  0.18  0.85  4.22
14:20:01      808    9   1000  0.39  0.35  2.34
14:30:01      804   14   1032  0.31  0.33  1.38
14:40:01      920    8    999  0.51  0.47  0.95
14:50:01     1124    9   1005  0.53  0.64  0.80
15:00:02      799   12   1016  0.34  0.40  0.58
15:10:01      770    6    973  0.02  0.14  0.35
15:20:01      707    4    964  0.08  0.17  0.27
15:30:01      749    5    978  0.10  0.18  0.23
15:40:01      798    5    975  0.43  0.31  0.27
15:50:01      818    8    975  0.84  3.10  2.48
16:00:01      822    6    969  0.54  0.73  1.45
16:10:01      908    4    966  0.44  0.40  0.90
16:20:01      752    4    973  0.05  0.18  0.55
16:30:01      740    6    992  0.36  0.25  0.39
16:40:03     1711   52   1053 22.93 10.65  4.57
16:50:01     1204    6    997  0.34  1.80  2.61
17:00:01     1212   18   1008  1.33  1.32  1.94
17:10:01      983    7    974  1.40  1.37  1.68
17:20:01      990    9    977  0.56  0.63  1.13
17:30:18      693   49   1050 35.06 15.92  6.77

OLD HOST (proxmox 1.2) (after 9:30am the load has remained below 3, never reaching 3.)
HTML: 
Linux  oldhost  2.6.24-5-pve  #1 SMP PREEMPT Tue May 12 09:01:17 CEST 2009  x86_64  11/06/2009

00:00:01  pswch/s runq nrproc lavg1 lavg5 avg15            _procload_
08:40:01      261    6    173  0.65  0.65  0.70
08:50:01      343    7    179  1.84  1.37  0.97
09:00:01      269    7    181  1.05  0.87  0.85
09:10:01      260    6    174  0.22  0.41  0.61
09:20:01     3462    4    183 14.38  7.16  3.14
09:30:01     2138    4    251  1.32  4.69  4.43
09:40:01     1385    5    247  1.61  2.49  3.42
09:50:01     1097    6    251  1.14  1.38  2.42
10:00:01      699   10    240  1.85  1.19  1.75
10:10:01      713   10    243  0.70  0.87  1.35
10:20:01      666    7    237  1.16  1.18  1.21
10:30:01      587    7    255  1.00  0.96  1.02
10:40:01      645    6    236  0.24  0.64  0.87
10:50:01      344    5    242  0.31  0.33  0.58
11:00:01      437    7    242  0.57  0.77  0.68
11:10:01      454    4    233  0.28  0.33  0.46
11:20:01      314    9    242  0.66  0.35  0.39
11:30:01      270   10    248  0.37  0.28  0.34
11:40:01      498    7    249  0.44  0.72  0.56
11:50:01      541    5    250  0.24  0.51  0.58
12:00:01      546    9    251  0.54  0.45  0.49
12:10:01      641    5    251  0.81  0.67  0.55
12:20:01     1028    5    263  1.30  1.38  1.00
12:30:01      522    6    250  0.49  0.70  0.85
12:40:01      428    3    246  0.25  0.50  0.66
12:50:01      433    7    252  0.57  0.42  0.52
13:00:01      419    6    256  0.26  0.38  0.45
13:10:01      530    8    264  0.81  0.63  0.55
13:20:01      645    6    263  1.18  0.77  0.60
13:30:01     1035   10    273  1.37  1.23  0.91
13:40:01      494    7    250  0.62  0.77  0.83
13:50:01      697    6    266  1.03  0.89  0.84
14:00:01      556    7    272  1.28  0.90  0.80
14:10:01      859    6    253  1.09  0.94  0.86
14:20:01      681    5    249  0.92  0.90  0.84
14:30:01      722    9    272  1.04  0.85  0.80
14:40:01     1079    6    245  2.10  1.42  1.03
14:50:01     1449    5    238  1.23  1.60  1.35
15:00:01      868    8    247  1.12  1.12  1.22
15:10:01      671    6    242  0.94  0.92  1.03
15:20:01      497    6    236  0.73  0.74  0.87
15:30:01      536    8    239  1.18  0.79  0.77
15:40:01      302    4    234  1.00  0.75  0.73
15:50:01      452    4    238  0.75  0.57  0.59
16:00:01      453   10    248  0.50  0.64  0.61
16:10:01      275    4    235  0.25  0.32  0.49
16:20:01      312    7    257  0.52  0.38  0.39
16:30:01      516    9    244  0.16  0.38  0.41
16:40:01      493    6    243  0.27  0.36  0.36
16:50:01      468    8    246  0.26  0.37  0.39
17:00:01      409    5    257  0.32  0.45  0.46
17:10:01      527    9    243  0.79  0.67  0.53
17:20:01      424    7    240  0.65  0.56  0.54
17:30:01      352    8    239  0.33  0.35  0.43
 
today i converted all windows vms from qcow2 to raw and installed the latest virtio storage drivers.
then i changed the disk to virtio and this was a HUGE performance boost at all!
 
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