Sure but how do i do that? I can check the memory usage on the guest using rivaturner ( i don't use more than 9gB of ram, i have 16), may the problem come from the balloon option at the end of the xml ? Dunno how to check the rest though.
For disk io i use a separate ssd for the vm and all other disks are not mount when i launch it (it will fail otherwise if i remember correctly). But talking about swap i need to check where the swap for fedora is, maybe there is something worth checking here. I already reduced the memory i assign to the windows vm because otherwise it would fail, apparently fedora likes to take a lot of ram of nothing. 2015-12-29 11:38 GMT+01:00 Karsten Elfenbein <karsten.elfenb...@gmail.com>: > If it takes time to recover after exiting the VM I think you have a > different problem than CPU pinning. > While my Windows VM is idle all CPU cores are idle on the host as well. > > Time to recover sounds more like a system that swapped out memory to > make room for the VM. After exiting it needs the swapped out process > memory which takes time. > Can you check the memory/swap/disk io usage? > > 2015-12-29 11:13 GMT+01:00 thibaut noah <thibaut.n...@gmail.com>: > > I'll try to set the topology tonight. > > Fedora still takes time to be fully operationnal after exiting windows, > and > > i use windows only not putting more load on fedora, weird. > > My goal by tweaking the vcpu is to get the best possible performance i > can > > reach without crippling the host os. > > dual xeon are indeed expensive, specially those with 3+ghz, dunno if i > need > > that much cpu for windows though i'm not sure, i can try by just using > > 2physical cores and see how it goes for both os, would be nice if i could > > apply the new patch to move my keyboard from guest to host T_T > > > > 2015-12-28 10:54 GMT+01:00 Karsten Elfenbein < > karsten.elfenb...@gmail.com>: > >> > >> It just hands the layout of your CPU to the guest. So apps can decide > >> on threading. > >> > >> Pinning the CPU to avoid CPU 0 and 4 will reduce the performance a bit > >> as a complete physical core is reserved for the host OS. > >> There are faster Desktop CPUs to compensate if needed but dual Xeon > >> that can keep up in single thread performance are expensive and you > >> would need 2 CPU + memory + board. > >> > >> > >> > >> 2015-12-28 10:24 GMT+01:00 Eddie Yen <missile0...@gmail.com>: > >> > > >> > 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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