----- Original Message ----- > From: "Doron Fediuck" <[email protected]> > To: [email protected] > Cc: [email protected] > Sent: Sunday, May 20, 2012 5:49:08 PM > Subject: Re: [Engine-devel] CPU Pinning @engine > > 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.
We shouldn't block migration If a user wants to not migrate a cpu pinned VM then let them use the non-migratable flag in the UI. > > >> 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"<[email protected]> > >>>> To: [email protected] > >>>> 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!" > >>>> _______________________________________________ > >>>> Engine-devel mailing list > >>>> [email protected] > >>>> http://lists.ovirt.org/mailman/listinfo/engine-devel > >>>> > >>> _______________________________________________ > >>> Engine-devel mailing list > >>> [email protected] > >>> http://lists.ovirt.org/mailman/listinfo/engine-devel > >> > >> > > > > > -- > > /d > > Never say "OOPS!" always say "Ah, Interesting!" > _______________________________________________ > Engine-devel mailing list > [email protected] > http://lists.ovirt.org/mailman/listinfo/engine-devel > _______________________________________________ Engine-devel mailing list [email protected] http://lists.ovirt.org/mailman/listinfo/engine-devel
