IO delays problemes i need help thanks

J

johnfaiz

Member
Sep 30, 2012
54
0
6
i have dedicated servers 128 giga ram and processor xeon e5 2670 i have IO delays 5%-10% when i make any thing on any vps my vps config is virtio drivers for disk and network and pci ballon and i use on disk write back cache and when i run pvperf i got very bad results iwill upload print screen and my hard disk is sata 3 no raid and processor is 80% usage its not very high and my vms windows looks like shit very slow its freezing i hope any one here can help be about io delay probleme and the slow of buffered reads pveperf.jpg
 
Change writeback to no-cache on all your VM disks, stop the VM, then start it.
Do this on all VMs.

Once that is done run pveperf again and post the results.

Also, run this command for a little bit while you observe how your VMs are behaving:
Code: 
vmstat 1
NOTE: Ctrl + C will stop this.
Also, make the putty window wide enough so the output does not line wrap.

If you were unaware, you can copy/paste the text from the Putty window, left mouse button drag to select the highlighted area is auto copied to clipboard.
Scroll back in the putty buffer and copy as much of that vmstat 1 output as you can, post it here.
It would be very helpful if you can mark on the vmstat 1 output things like "Was running ok here" or "Was super slow here" etc.

Lastly, what do these VMs do? Web servers? DB Servers? What sort of IO do they do, sequential read/write? random read/write?
 
e100 said:
Change writeback to no-cache on all your VM disks, stop the VM, then start it.
Do this on all VMs.

Once that is done run pveperf again and post the results.

Also, run this command for a little bit while you observe how your VMs are behaving:
Code: 
vmstat 1
NOTE: Ctrl + C will stop this.
Also, make the putty window wide enough so the output does not line wrap.

If you were unaware, you can copy/paste the text from the Putty window, left mouse button drag to select the highlighted area is auto copied to clipboard.
Scroll back in the putty buffer and copy as much of that vmstat 1 output as you can, post it here.
It would be very helpful if you can mark on the vmstat 1 output things like "Was running ok here" or "Was super slow here" etc.

Lastly, what do these VMs do? Web servers? DB Servers? What sort of IO do they do, sequential read/write? random read/write?
Click to expand...

its for online games Silkroad private servers
 
veryyyyy slow now idon't know why i use ur advice for this
vm.dirty_ratio = 5
vm.dirty_background_ratio = 10
what value should i use ? thanks
 
4 0 87264 68288720 16668 92504 0 0 2722 520 18542 64699 24 4 72 1
5 0 87264 68288408 16668 92516 0 0 3662 320 17415 64816 21 3 77 0
6 0 87264 68295744 16668 92304 0 0 2130 214 17260 63353 21 3 77 0
3 0 87264 68295520 16668 92516 0 0 1659 457 17899 68794 20 3 77 0
2 0 87264 68303232 16668 92520 0 0 1225 160 16865 63164 19 3 79 0
6 1 87264 68302368 16676 92512 0 0 1428 254 16401 61345 18 2 79 1
7 0 87264 68301008 16676 92520 0 0 3267 159 17177 63207 20 2 78 0
4 0 87264 68301744 16676 92528 0 0 12919 181 17784 65307 19 4 77 0
4 0 87264 68308488 16680 89204 0 0 3094 715 19010 66714 20 3 77 0
5 0 87264 68308960 16680 89420 0 0 4847 263 17477 65131 20 3 77 0
4 1 87264 68308480 16688 89412 0 0 2250 175 17292 63580 20 3 76 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
4 0 87264 68303520 16688 92740 0 0 2043 269 17427 64488 20 2 78 0
4 0 87264 68310192 16688 89208 0 0 1964 308 17427 65131 20 3 77 0
3 0 87264 68309264 16688 89420 0 0 2048 1437 18164 70433 22 3 75 0
6 0 87264 68303728 16688 92740 0 0 2488 1065 17610 64454 21 3 76 0
4 1 87264 68302128 16696 92520 0 0 2010 226 17113 63376 20 3 77 0
5 0 87264 68301848 16696 92528 0 0 2016 161 17187 63246 20 3 77 0
3 0 87264 68301848 16696 92528 0 0 2360 226 17492 64238 21 3 77 0
6 0 87264 68303512 16696 92528 0 0 1438 401 17799 65283 21 3 76 0
2 0 87264 68302288 16696 92528 0 0 1585 231 17291 62921 19 3 78 0
5 1 87264 68299408 16704 92520 0 0 2235 218 17480 63389 20 3 76 0
4 0 87264 68300208 16704 92528 0 0 2290 217 17157 62523 19 3 77 1
3 0 87264 68295672 16704 95852 0 0 2097 441 17507 63018 19 3 78 0
5 0 87264 68289168 16704 95644 0 0 2336 348 17774 68513 20 3 77 0
3 0 87264 68264936 16704 98968 0 0 2018 137 18495 69952 21 3 76 0
2 0 87264 68246912 16704 104732 0 0 2023 361 20614 65810 20 3 77 0
6 0 87264 68247288 16712 104972 0 0 2756 403 36346 81706 22 5 72 1
2 1 87264 68247280 16712 104972 0 0 1572 280 17251 62283 19 3 78 1
2 0 87264 68248744 16712 104972 0 0 2121 167 17558 64065 20 3 77 0
3 0 87264 68248392 16712 104972 0 0 1436 427 17286 62638 19 2 79 0
4 0 87264 68260992 16712 101652 0 0 994 304 17928 63487 20 3 76 1
8 0 87264 68273840 16720 98544 0 0 1025 333 18490 65178 19 3 77 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
2 1 87264 68281080 16728 95428 0 0 1090 165 17322 63596 19 3 78 1
5 0 87264 68294304 16728 92336 0 0 1276 301 18200 68806 22 3 74 1
1 0 87264 68293872 16728 92552 0 0 1069 302 17104 62274 18 3 78 0
6 0 87264 68293256 16728 92552 0 0 1548 320 17616 64387 20 3 77 0
9 0 87264 68293376 16732 92548 0 0 1777 190 17410 64729 21 3 76 0
1 1 87264 68294096 16744 92540 0 0 1915 220 17886 72017 21 3 75 1
2 0 87264 68293632 16748 92548 0 0 2875 218 18119 68042 21 3 75 0
1 0 87264 68294504 16756 92548 0 0 1801 73 17414 64609 20 3 77 0
2 1 87264 68294504 16764 92544 0 0 1698 218 16576 62356 19 3 77 1
6 0 87264 68301688 16768 89228 0 0 2489 172 17216 63747 20 3 77 0
2 0 87264 68300960 16768 89444 0 0 2724 188 17382 64862 20 3 77 0
2 0 87264 68296144 16776 92760 0 0 1587 264 17073 64952 20 3 75 1
3 0 87264 68295968 16780 92548 0 0 2648 143 17974 70182 20 3 77 0
2 0 87264 68295840 16784 92548 0 0 1339 378 17252 67042 20 2 77 1
1 0 87264 68294592 16784 92552 0 0 2253 516 17477 65111 20 4 76 0
1 0 87264 68292960 16784 92552 0 0 1191 127 17082 63836 19 3 78 0
2 0 87264 68293336 16792 92552 0 0 1101 292 17537 65385 20 3 76 1
2 0 87264 68288888 16792 95872 0 0 1698 249 17470 65687 20 3 76 0
2 0 87264 68286848 16792 95668 0 0 823 583 17283 63551 20 3 78 0
2 0 87264 68287552 16792 95668 0 0 1007 96 17374 64922 20 3 77 0
5 0 87264 68300824 16792 92348 0 0 2076 68 17449 64889 21 3 76 0
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
2 0 87264 68294992 16804 92556 0 0 2019 270 18170 66378 23 3 73 1
1 0 87264 68281232 16804 95884 0 0 1141 232 18028 71260 21 3 76 0
1 0 87264 68252912 16804 101648 0 0 3236 501 18221 67410 22 3 75 0
1 0 87264 68252592 16804 101888 0 0 1334 470 17429 64402 19 3 77 1
3 0 87264 68262624 16804 98568 0 0 1493 360 17480 64463 20 3 77 0
6 0 87264 68264016 16812 98772 0 0 1609 227 17917 67134 20 3 75 1
3 0 87264 68276528 16812 95460 0 0 1267 215 17513 66775 19 3 78 0
0 0 87264 68287040 16812 92352 0 0 2605 303 18566 65972 25 4 71 0
3 0 87264 68289248 16816 92564 0 0 3690 197 17495 64962 19 3 77 0
2 0 87264 68288096 16828 92556 0 0 5671 87 18441 72927 21 3 75 1
3 0 87264 68287752 16836 92560 0 0 3722 141 17819 66050 21 3 75 1
3 0 87264 68288072 16840 92568 0 0 1679 281 17876 67437 21 3 76 0
19 0 87264 68288112 16848 92560 0 0 1903 112 17419 64531 19 3 77 1
11 0 87264 68283672 16852 95884 0 0 5513 7334 18053 66332 21 3 76 0
7 0 87264 68296440 16852 92360 0 0 4525 294 18856 66548 21 3 76 0
5 0 87264 68296640 16860 92564 0 0 1864 99 17579 64161 19 2 78 1
6 0 87264 68299200 16860 92576 0 0 2563 169 17603 66309 19 3 78 0
5 0 87264 68298272 16860 92576 0 0 1669 179 17639 65580 19 3 78 0
2 0 87264 68298432 16860 92576 0 0 1832 434 17225 64422 19 3 78 0
5 0 87264 68297424 16860 92576 0 0 1492 3370 17113 62153 19 3 78 0
8 0 87264 68295304 16868 92568 0 0 1490 201 18250 66020 20 3 76 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
5 0 87264 68296240 16868 92576 0 0 3479 280 18763 77140 22 3 75 0
3 0 87264 68291536 16868 95900 0 0 3392 125 18104 65854 20 2 78 0
9 0 87264 68291520 16868 95688 0 0 3668 291 18107 66294 21 3 77 0
3 0 87264 68291536 16868 95688 0 0 1849 256 17884 65696 20 3 77 0
4 0 87264 68298552 16876 92360 0 0 3262 297 18609 67078 21 4 74 0
4 0 87264 68299104 16876 92580 0 0 3636 630 18384 66337 22 3 75 0
5 0 87264 68305400 16876 89260 0 0 5602 1234 18149 66174 22 3 76 0
3 0 87264 68305152 16876 89476 0 0 3410 33 17735 66011 21 3 76 0
5 0 87264 68298976 16876 92796 0 0 2601 563 17574 65327 19 3 77 0
3 0 87264 68293624 16884 92576 0 0 1645 175 17643 65009 20 3 76 1
2 0 87264 68267344 16884 95696 0 0 928 979 17850 69628 22 3 76 0
3 0 87264 68255552 16884 99020 0 0 1618 94 17143 63146 19 2 78 0
3 0 87264 68250984 16884 102128 0 0 1094 366 17306 65676 21 3 76 0
5 0 87264 68251184 16884 101916 0 0 2411 382 17474 65443 20 3 77 0
5 0 87264 68246656 16892 105228 0 0 2421 368 17530 64524 20 3 76 1
3 0 87264 68258808 16892 101704 0 0 1381 475 17753 65664 20 3 77 0
7 0 87264 68271904 16892 98600 0 0 2618 225 17783 66573 20 3 77 0
3 0 87264 68285408 16892 95492 0 0 1733 180 17136 63128 18 3 79 0
5 0 87264 68285312 16892 95704 0 0 1142 247 17061 63223 19 3 78 0
3 0 87264 68292064 16900 92380 0 0 1977 361 17761 66225 21 3 75 1
11 0 87264 68291552 16900 92596 0 0 816 223 17552 68986 20 3 77 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
5 0 87264 68288680 16900 92600 0 0 1397 125 17426 64375 20 3 77 0
2 0 87264 68290016 16900 92600 0 0 2135 267 17416 64264 20 3 77 0
4 1 87264 68290288 16904 92596 0 0 1437 195 16796 63696 19 3 78 0
9 0 87264 68291056 16912 92592 0 0 1571 486 17192 63761 21 3 75 2
4 0 87264 68292944 16912 92388 0 0 894 212 17135 62715 19 3 78 0
4 0 87264 68293296 16912 92600 0 0 1265 259 16897 62909 18 3 79 0
4 0 87264 68292560 16912 92600 0 0 836 280 17018 62916 20 3 78 0
3 0 87264 68304992 16912 89280 0 0 834 162 16944 63877 20 3 77 0
5 0 87264 68304216 16920 89488 0 0 1097 229 17211 63377 19 3 76 2
4 0 87264 68298968 16920 92816 0 0 2092 130 18346 71157 21 3 76 0
^Z
[1]+ Stopped vmstat 1
root@ns5001282:~#
 
Long Long time ago I assigned two sockets to a VM on a single socket machine, I remember the VM being super slow.
I noticed that the VM config you posted earlier said "sockets: 2"

Try changing all of your VMS to have one CPU not two.
You can assign multiple cores just not multiple CPUs

Please report back if that helps or not.
 
e100 said:
Long Long time ago I assigned two sockets to a VM on a single socket machine, I remember the VM being super slow.
I noticed that the VM config you posted earlier said "sockets: 2"

Try changing all of your VMS to have one CPU not two.
You can assign multiple cores just not multiple CPUs

Please report back if that helps or not.
Click to expand...

okay working on it now and wait my answer and thanks alot you are the best guy here ♥
 
e100 said:
Since you only have a single SATA disk you might benefit from writethrough or writeback.
Change one thing at a time so we know what does or does not help, so leave them nocache for now.
Click to expand...

for no cache they are very slow yea io delay 0! but vms very slow
 
The cache from writethrough or writeback can hide or mask issues.
The vmstat issue you provided earlier shows very little disk io and no IO Wait.
The interrupts and context switches were rather high, thats why I took a 2nd look at the config you provided earlier.

I would like to know how well it performs with no cache and single socket assigned to the VM.

You only have a single SATA disk, it is not going to be super fast especially if you are doing lots of random IO.
 
e100 said:
The cache from writethrough or writeback can hide or mask issues.
The vmstat issue you provided earlier shows very little disk io and no IO Wait.
The interrupts and context switches were rather high, thats why I took a 2nd look at the config you provided earlier.

I would like to know how well it performs with no cache and single socket assigned to the VM.

You only have a single SATA disk, it is not going to be super fast especially if you are doing lots of random IO.
Click to expand...

anyway we can say 2 socket processor make much probleme but i have another dedi and use 2 socket and work fine ! but anyway thanks alot my friend and i hope you add me on FB or skype or any where and be friends thanks alot E100 u deserve thanks realy thanks ♥
 
e100 said:
So changing the sockets (CPU) to 1 fixed your problem?
If so, can you post some vmstat 1 output? I am quite curious to see what changed, interrupts, context switches, both.....
Click to expand...

not io delay but its better for vms and tell me how u look on vmstat 1 what u understand from this :D?
 
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