After update to 2.6.32-2-pve, load average increase from 0 to 2

RCK · Jun 1, 2010

Hello,

I just updated my proxmox farm from 2.6.32-1 to 2.6.32-2 kernel (with all package available in deb http://download.proxmox.com/debian lenny pve).
All was okay except my cpu load average is now between 2 and 3, instead of 0

The VM image have not changed, so it's not their fault.

Please see attached files for htop and cacti information.
If you have any ideas to come back to a small load, tell me what to test

Rck

pveversion -v

Code:

pdm2:~# pveversion -v
pve-manager: 1.5-9 (pve-manager/1.5/4728)
running kernel: 2.6.32-2-pve
proxmox-ve-2.6.32: 1.5-7
pve-kernel-2.6.32-2-pve: 2.6.32-7
qemu-server: 1.1-14
pve-firmware: 1.0-5
libpve-storage-perl: 1.0-13
vncterm: 0.9-2
vzctl: 3.0.23-1pve11
vzdump: 1.2-5
vzprocps: 2.0.11-1dso2
vzquota: 3.0.11-1
pve-qemu-kvm: 0.12.4-1
ksm-control-daemon: 1.0-3

RCK · Jun 2, 2010

Okay, after testing, I confirm that there is a bug in the pve-kernel-2.6.32-2-pve. (at least on my hardware - Dell Optiplex 380 SF - Core2Duo 8400 - 4GB)
Rolling back to pve-kernel-2.6.32-1-pve or pve-kernel-2.6.18-2-pve fix the KVM load average problem.

tesquenure · Jun 21, 2010

Hi RCK,

How do you rolling back to 32-1 ?

Regards

Tes

RCK · Jun 21, 2010

If you had installed the 2.6.32-1 before, the install packages should still be on your server.
So, just execute the following commands:

cd /var/cache/apt/archives
dpkg -i proxmox-ve-2.6.32_1.5-4_all.deb

then vim /boot/grub/menu.lst
and remove the 2.6.32-2 bloc at the bottom

title Proxmox Virtual Environment, kernel 2.6.32-2-pve
root (hd0,0)
kernel /vmlinuz-2.6.32-2-pve root=/dev/mapper/pve-root ro
initrd /initrd.img-2.6.32-2-pve

be sure to keep the kernel 2.6.32-1-pve bloc, or your server will not reboot

tesquenure · Jun 21, 2010

Hi RCH,

Thats work find, thx alot.

Regards,

Tes

joolsr · Jun 24, 2010

Do i take it then that 2.6.32-2 is still problematic ? I dont have 2.6.32-1 to go to.

tesquenure · Jun 24, 2010

Hi Joolsr,

For me yes on a nother server.

Im not sure its the good way, but i do that :
Download :
ftp://download.proxmox.com/debian/d...64/pve-kernel-2.6.32-1-pve_2.6.32-4_amd64.deb
ftp://download.proxmox.com/debian/dists/lenny/pve/binary-amd64/proxmox-ve-2.6.32_1.5-4_all.deb
in my /root
then :

dpkg -i /root/pve-kernel-2.6.32-1-pve_2.6.32-4_amd64.deb /root/proxmox-ve-2.6.32_1.5-4_all.deb
reboot

Regards,
Tes

tesquenure · Jun 24, 2010

Hi,

Tests on 2 serveur. Same CPU modele (4 x Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz)
Motherboard memory and HDD are different.
Same VM KVM

3.6.32-2

load average: 0.68, 0.60, 0.48

Code:

pveversion -v
pve-manager: 1.5-9 (pve-manager/1.5/4728)
running kernel: 2.6.32-2-pve
proxmox-ve-2.6.32: 1.5-7
pve-kernel-2.6.32-2-pve: 2.6.32-7
pve-kernel-2.6.18-2-pve: 2.6.18-5
qemu-server: 1.1-14
pve-firmware: 1.0-5
libpve-storage-perl: 1.0-13
vncterm: 0.9-2
vzctl: 3.0.23-1pve11
vzdump: 1.2-5
vzprocps: 2.0.11-1dso2
vzquota: 3.0.11-1
pve-qemu-kvm: 0.12.4-1
ksm-control-daemon: 1.0-3

p

Code:

veperf
CPU BOGOMIPS:      21334.01
REGEX/SECOND:      656160
HD SIZE:           94.49 GB (/dev/mapper/pve-root)
BUFFERED READS:    74.54 MB/sec
AVERAGE SEEK TIME: 8.88 ms
FSYNCS/SECOND:     965.97

3.6.32-1

0.00, 0.06, 0.07

Code:

pveversion -v
pve-manager: 1.5-9 (pve-manager/1.5/4728)
running kernel: 2.6.32-1-pve
proxmox-ve-2.6.32: 1.5-4
pve-kernel-2.6.32-1-pve: 2.6.32-4
pve-kernel-2.6.32-2-pve: 2.6.32-7
pve-kernel-2.6.18-2-pve: 2.6.18-5
qemu-server: 1.1-14
pve-firmware: 1.0-5
libpve-storage-perl: 1.0-13
vncterm: 0.9-2
vzctl: 3.0.23-1pve11
vzdump: 1.2-5
vzprocps: 2.0.11-1dso2
vzquota: 3.0.11-1
pve-qemu-kvm: 0.12.4-1
ksm-control-daemon: 1.0-3

Code:

pveperf
CPU BOGOMIPS:      21332.20
REGEX/SECOND:      714584
HD SIZE:           94.49 GB (/dev/mapper/pve-root)
BUFFERED READS:    112.25 MB/sec
AVERAGE SEEK TIME: 8.75 ms
FSYNCS/SECOND:     1135.09

Hope that can help

Regards,

Tes

dodeeric · Sep 2, 2010

I just upgraded my Proxmox VE server to kernel 2.6.32-3 (pve-kernel-2.6.32-3-pve). Regarding the load, it looks better than kernel 2.6.32-2, but still not as kernel 2.6.32-1.

pve-kernel-2.6.32-1-pve: 0.00
pve-kernel-2.6.32-2-pve: 0.50
pve-kernel-2.6.32-3-pve: 0.10

dietmar · Sep 2, 2010

dodeeric said:
I just upgraded my Proxmox VE server to kernel 2.6.32-3 (pve-kernel-2.6.32-3-pve). Regarding the load, it looks better than kernel 2.6.32-2, but still not as kernel 2.6.32-1.

What kernel version do you use exactly?

dietmar · Sep 2, 2010

dodeeric said:
Regarding the load, it looks better than kernel 2.6.32-2, but still not as kernel 2.6.32-1.

BTW, the 'load' is a totally artificial mesurement. Is there any sign that your host perform worse?

dodeeric · Sep 2, 2010

Dietmar,

I am using kernel 2.6.32-3-pve 64 bits (x86_64).

To be honnest, I do not see any problem with 2.6.32-2-pve or 2.6.32-3-pve! It is just than the load average "seems" higher.

I do not think there is a problem to use kernel 2.6.32-3-pve.

dodeeric · Sep 2, 2010

Sorry, please read:

pve-kernel-2.6.32-1-pve: 0.00
pve-kernel-2.6.32-2-pve: 0.50
pve-kernel-2.6.32-3-pve: 0.10

dodeeric · Sep 2, 2010

Dietmar,

My mistake, the load is as follow:

pve-kernel-2.6.32-1-pve: 0.00
pve-kernel-2.6.32-2-pve: 0.50
pve-kernel-2.6.32-3-pve: 0.10

With pve-kernel-2.6.32-3-pve, it is almost again the same as pve-kernel-2.6.32-1-pve.

RCK · Sep 2, 2010

It's a good news to see the Load Average decrease with pve-kernel-2.6.32-3-pve, because even if it's a artificial mesurement, the jump was so huge between 32-1 and 32-2 that it was scary

dodeeric · Sep 2, 2010

Now I have upgraded my second Proxmox VE server to kernel 2.6.32-3 (pve-kernel-2.6.32-3-pve). Regarding the load, it looks like kernel 2.6.32-1:

pve-kernel-2.6.32-1-pve: 0.00
pve-kernel-2.6.32-2-pve: 0.50
pve-kernel-2.6.32-3-pve: 0.00

Kernel: pve-kernel-2.6.32-3-pve
CPU: Intel Core i7-860 @ 2.80 GHz -- 4 cores / 8 threads
Architecture: x86_64

My first server:

Kernel: pve-kernel-2.6.32-3-pve
CPU: Intel Core 2 Quad Q6600 @ 2.40 GHz -- 4 cores
Architecture: x86_64

meto · Sep 2, 2010

dodeeric said:
Now I have upgraded my second Proxmox VE server to kernel 2.6.32-3 (pve-kernel-2.6.32-3-pve). Regarding the load, it looks like kernel 2.6.32-1:

pve-kernel-2.6.32-1-pve: 0.00
pve-kernel-2.6.32-2-pve: 0.50
pve-kernel-2.6.32-3-pve: 0.00

Kernel: pve-kernel-2.6.32-3-pve
CPU: Intel Core i7-860 @ 2.80 GHz -- 4 cores / 8 threads
Architecture: x86_64

My first server:

Kernel: pve-kernel-2.6.32-3-pve
CPU: Intel Core 2 Quad Q6600 @ 2.40 GHz -- 4 cores
Architecture: x86_64

Are those OVH servers? (You have CPUs from their offer

)

tesquenure · Sep 2, 2010

Hi,
Does 2.6.32-3 come from pve update or pve-test update ?

Regards,

Tes

PS : Just see the new version of PVE ^^
Download and test it today

dietmar · Sep 3, 2010

tesquenure said:
Hi,
Does 2.6.32-3 come from pve update or pve-test update ?

Both repositories contain the same version currently. Why don't you simply use the full version numbers when you talk aboout kernel versions? Current package version is "2.6.32-12"

(file name: pve-kernel-2.6.32-3-pve_2.6.32-12_amd64.deb)

dodeeric · Sep 3, 2010

meto said:
Are those OVH servers? (You have CPUs from their offer )

No, they are dedicated servers.

After update to 2.6.32-2-pve, load average increase from 0 to 2

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