[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v6 00/10] vnuma introduction
On Tue, Jul 22, 2014 at 05:06:37PM +0200, Dario Faggioli wrote: [...] > > > > With the following guest configuration, in terms of vcpu pinning: > > > > > > 1) 2 vCPUs ==> same pCPUs > > > > 4 vcpus, I think. > > > > > root@benny:~# xl vcpu-list > > > Name ID VCPU CPU State Time(s) CPU > > > Affinity > > > debian.guest.osstest 9 0 0 -b- 2.7 0 > > > debian.guest.osstest 9 1 0 -b- 5.2 0 > > > debian.guest.osstest 9 2 7 -b- 2.4 7 > > > debian.guest.osstest 9 3 7 -b- 4.4 7 > > > > What I meant with "2 vCPUs" was that I was putting 2 vCPUs of the guest > (0 and 1) on the same pCPU (0), and the other 2 (2 and 3) on another > (7). > > That should have meant a topology that does not share at least the least > cache level in the guest, but it is not. > I see. > > > 2) no SMT > > > root@benny:~# xl vcpu-list > > > Name ID VCPU CPU State Time(s) CPU [...] > So, no, that is not giving the same result as in Dom0. :-( > > > > This is not the case for dom0 where (I booted with dom0_max_vcpus=4 on > > > the xen command line) I see this: > > > > > > > I guess this is because you're basically picking pcpu 0-3 for Dom0. It > > doesn't matter if you pin them or not. > > > That makes total sense, and in fact, I was not surprised about Dom0 > looking like this... I rather am about not being able to get a similar > topology for the guest, no matter how I pin it... :-/ > I guess it might also be related to the different CPUID policy Dom0 and DomU have. Though in theory Dom0 and DomU are both PV domains they see different CPUIDs, I think. I only studied code to the point that I was able to manipulate topology as I saw fit, so I could be wrong... Wei > Dario > > -- > <<This happens because I choose it to happen!>> (Raistlin Majere) > ----------------------------------------------------------------- > Dario Faggioli, Ph.D, http://about.me/dario.faggioli > Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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