[Engine-devel] CPU Pinning @engine

[Doron Fediuck]

On 20/05/12 21:41, Dor Laor wrote:
> On 05/17/2012 11:15 PM, Doron Fediuck wrote:
>> On 17/05/12 20:28, Ayal Baron wrote:
>>> "Live migration will not be supported for such VM's."
>>>
>>> Migration will work on homogeneous clusters so this should not be enforced (not limited to VMs which are pinned to host) just give a warning.
>>>
>> I agree, but if we wish to ping vCPUx to pCPUy in host a, we cannot ensure to have the same in host b,
>> since it may have pCPUy too busy, so performance will degrade. Also, I hope you saw my general comment
> 
> Performance may degrade on any migration to loaded host regardless of pinning.
> 
> There is not need to forbid migration. Instead, the SLA assurance policy should verify the dedicated resources and match the target w/ the guarantee and decide according to this.
> 
Thanks for the input.
We may start with migration blocked in a configurable manner, so people who wish migrate to work
will simply set the relevant configuration key.
As for looking for a matched CPU, will add it as p2.

>> about starting with a humble solution and gradually improving. In this context (auto)numa can help us,
>> so we better do numa than handle migration for basic mode, risking performance issues.
>>
>>>
>>> ----- Original Message -----
>>>> From: "Doron Fediuck"<dfediuck at redhat.com>
>>>> To: engine-devel at ovirt.org
>>>> Sent: Thursday, May 17, 2012 2:42:46 PM
>>>> Subject: [Engine-devel] CPU Pinning @engine
>>>>
>>>> Hi All,
>>>> Currently the VDSM has a CPU pinning hook.
>>>> We'd like to add better support of it into the engine itself.
>>>> Here's a design draft to cover it:
>>>> http://www.ovirt.org/wiki/Features/Design/cpu-pinning
>>>>
>>>> Please review and comment if needed.
>>>>
>>>> Thanks!
>>>> -- 
>>>>
>>>> /d
>>>>
>>>> Never say "OOPS!" always say "Ah, Interesting!"
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>>
>>
> 


-- 

/d

Never say "OOPS!" always say "Ah, Interesting!"