[pve-devel] intel pstate: wrong cpu frequency with performance governor
aderumier at odiso.com
Mon Sep 19 10:08:45 CEST 2016
>>And it's being changed based on cpu load, like actual governor is ondemand.
>From what I read, the intel pstate "performance", have a range min_freq / max_freq.
So it seem to be different than cpufreq "performance", which is "max performance"
(min_freq can be change manually through sysfs, but I don't think they are a kernel option to fix to max at boot)
I'm currently compiling the kernel with patches from Stefan, I'll make a report this afternoon.
----- Mail original -----
De: "Dmitry Petuhov" <mityapetuhov at gmail.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Lundi 19 Septembre 2016 09:47:21
Objet: Re: [pve-devel] intel pstate: wrong cpu frequency with performance governor
19.09.2016 01:29, Alexandre DERUMIER wrote:
> I have add some strange behaviour of some host last week, (cpu performance degrading)
> and I have found than 3 hosts of my 15 host cluster have wrong cpu frequency.
> All nodes are dell r630, with xeon v3 3,1ghz. (all with last bios/microcode updates , last proxmox kernel)
> On the 3 hosts, the frequency was stuck to 800mhz instead 3,1ghz. (note that on other host, the frequency was not stable, up and down between 3,09 && 3,2ghz....)
> Cpu governor is correctly set to max performance in bios + linux.
> It seem to be a problem with intel pstate driver.
> I have disabled it with intel_pstate=disable in grub, (also can be disable with CONFIG_X86_INTEL_PSTATE=n)
> and not frequency is super stable at 3,1ghz
> Has somebody already seen this on xeon v3 ?
Can confirm that on SandyBridge:
model name : Intel(R) Xeon(R) CPU E5-2665 0 @ 2.40GHz
root at msv-spb-pve01:/usr/share/perl5/PVE/Storage# cat
And it's being changed based on cpu load, like actual governor is ondemand.
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