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 > _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
