This should provide the guest some details of the provided vCPUs: <topology sockets='1' cores='3' threads='2'/>
I tested this method before, using the 4820K. The result I got is the performance not get better that set whole threads as cores when tested 3DMark. But I didn't pinning 0 and 4 thread to host. I'll test it again soon. 2015-12-28 17:13 GMT+08:00 Karsten Elfenbein <karsten.elfenb...@gmail.com>: > Hi, > > that looks good. Processors 0 and 4 are not used in pinning and remain > on the host OS. https://en.wikipedia.org/wiki/Hyper-threading > Basically as soon as you load one OS CPU on a physical core the other > HT core will be able to perform a lot less stuff. > > This should provide the guest some details of the provided vCPUs: > <topology sockets='1' cores='3' threads='2'/> > > > 2015-12-28 6:55 GMT+01:00 thibaut noah <thibaut.n...@gmail.com>: > > So is this the right emulation? If i understand correctly what i'm > trying to > > get is a 3cores with 2threads per core ? (so 6cores pinned?) > > I don't have that much knowledge in cpu so i'm kinda lost here. > > > > <cputune> > > <vcpupin vcpu='0' cpuset='1'/> > > <vcpupin vcpu='1' cpuset='2'/> > > <vcpupin vcpu='2' cpuset='3'/> > > <vcpupin vcpu='3' cpuset='5'/> > > <vcpupin vcpu='4' cpuset='6'/> > > <vcpupin vcpu='5' cpuset='7'/> > > </cputune> > > > > 2015-12-26 18:53 GMT+01:00 Karsten Elfenbein < > karsten.elfenb...@gmail.com>: > >> > >> check that the 2 cores for the host OS are on the same physical core > >> and that the VM does not use those 2 processors with the same core id > >> > >> cat /proc/cpuinfo | grep -e processor -e 'core id' > >> > >> CPU 0-3 should be the core 0-3 > >> CPU 4-7 should be the core 0-3 again with HT > >> > >> so leaving out CPU 0 and 4 should keep core 0 idle and the host OS > >> responsive > >> > >> taskset 1-3,5-7 startVM.sh > >> > >> Karsten > >> > >> 2015-12-26 12:56 GMT+01:00 Eddie Yen <missile0...@gmail.com>: > >> > Pining CPU can reduce the happening that host and guest using the same > >> > thread at the same time. > >> > > >> > And I don't know which program you're using on Fedora, so I don't have > >> > quite > >> > answer that 2 threads is enough for host or not. > >> > It's all depends on your usage case. > >> > > >> > 2015-12-26 19:44 GMT+08:00 thibaut noah <thibaut.n...@gmail.com>: > >> >> > >> >> My cpu is a i7 4790k, is pinning the cpu usefull ? I'll try to derp a > >> >> bit > >> >> with the vcpu thing, just afraid 2 threads aren't enough for fedora > :/ > >> >> > >> >> 2015-12-26 11:59 GMT+01:00 Eddie Yen <missile0...@gmail.com>: > >> >>> > >> >>> I forgot your CPU type, so I don't know about your case. > >> >>> > >> >>> But, as I'm using 4820K, I usually using 4 to 6 threads gave to VM, > >> >>> only > >> >>> use 2 threads for Fedora host. > >> >>> And most important is vCPU tweaks, especially CPU topology and > >> >>> Hyper-V. > >> >>> > >> >>> For me, I usually set topology as "sockets=1 cores=6 threads=1" if > >> >>> using > >> >>> 6 threads from host. > >> >>> Then set cpuset= to let vCPU worked on pointed CPU threads. > >> >>> > >> >>> IME, set all threads as vCPU cores can got better performance on > >> >>> Windows > >> >>> 10. > >> >>> > >> >>> 2015-12-26 18:00 GMT+08:00 thibaut noah <thibaut.n...@gmail.com>: > >> >>>> > >> >>>> Hello guys merry christmas ! o/ > >> >>>> My current issue is vm and host optimization, i use my windows 10 > vm > >> >>>> for > >> >>>> gaming purposes only (like most of us i think), problem is, to keep > >> >>>> my > >> >>>> performances on windows high i drain too much ressources on my > fedora > >> >>>> host > >> >>>> thus making it almost useless (also when leaving the vm i most of > the > >> >>>> time > >> >>>> found myself unable to use fedora at all so i have to reboot...). > >> >>>> So is it possible to improve performances to the max on the guest > >> >>>> without almost killing the host ? > >> >>>> Should i consider switching my gear for a bi-xeon? (to assign one > >> >>>> fully > >> >>>> to the host and one to the guest) > >> >>>> I'm actually not sure about what happen here, does anyone ran into > >> >>>> the > >> >>>> same sort of issue? > >> >>>> Have a good day > >> >>>> > >> >>>> _______________________________________________ > >> >>>> vfio-users mailing list > >> >>>> vfio-users@redhat.com > >> >>>> https://www.redhat.com/mailman/listinfo/vfio-users > >> >>>> > >> >>> > >> >> > >> > > >> > > >> > _______________________________________________ > >> > vfio-users mailing list > >> > vfio-users@redhat.com > >> > https://www.redhat.com/mailman/listinfo/vfio-users > >> > > > > > >
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