[pve-devel] intel pstate: wrong cpu frequency with performance governor

[Alexandre DERUMIER]

>>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: 
> Hi, 
> 
> 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 
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq 
1199906 

And it's being changed based on cpu load, like actual governor is ondemand. 

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