Hello everyone, i would like to use one of my domU with all 32 hardware cores but with lower priority (something like nice 10), but setting cpu weight seems to be someway unstable. Dom0 is Gentoo with Xen 4.3.0, 2 AMD Opetrons 6274 (32 cores), 64GB of memory, but dom0 runs on 16 cores and 32GB of memory. Hosts 5 linux domUs with similiar configs, each from 2 to 4 cores, from 1GB to 4GB of memory. DomU with all cores is Windows Server 2008R2 Enterprise with Terminal Services installed. When I set cpu-weight to 192 (others have 256 - default), it starts to lag. Applications became pretty slow and unstable. Can someone help how CPU priority works with Xen? Is it stable already? Where to start debug this issue. Thanks Jan _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
On mar, 2013-09-24 at 09:57 +0200, Jan Hejl wrote:> Hello everyone, >Hi,> i would like to use one of my domU with all 32 hardware cores but > with lower priority (something like nice 10), but setting cpu weight > seems to be someway unstable. >You mean you want that domU to have 32 vCPUs? Can I ask you from where this requirement comes from?> Dom0 is Gentoo with Xen 4.3.0, 2 AMD Opetrons 6274 (32 cores), 64GB of > memory, but dom0 runs on 16 cores and 32GB of memory. Hosts 5 linux > domUs with similiar configs, each from 2 to 4 cores, from 1GB to 4GB of > memory. DomU with all cores is Windows Server 2008R2 Enterprise with > Terminal Services installed. >Mmm... nice setup! :-P Do you mind sending here the output of the following commands, to help us picture the situation better? ~# xl info -n ~# xl list -n ~# xl vcpu-list If possible, run the following two too: ~# xl debug-key u ~# xl dmesg > xl-dmesg.log And attach the xl-dmesg.log file. Of course, do all the above with all your domains up and running, and after the re-weighting of the Win server.> When I set cpu-weight to 192 (others have 256 - default), it starts to > lag. Applications became pretty slow and unstable. >You mean apps inside the Win server with 32 vCPUs or in general? Regards, 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-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
Hello, sorry for late response. I''ve been on holidays. Dne 26.9.2013 10:06, Dario Faggioli napsal(a):> On mar, 2013-09-24 at 09:57 +0200, Jan Hejl wrote: >> Hello everyone, >> > Hi, > >> i would like to use one of my domU with all 32 hardware cores but >> with lower priority (something like nice 10), but setting cpu weight >> seems to be someway unstable. >> > You mean you want that domU to have 32 vCPUs? Can I ask you from where > this requirement comes from?There''s a lot of free resource over night when everyone sleeps and i want to use these resources to build video rendering farm. Does it makes sense?> >> Dom0 is Gentoo with Xen 4.3.0, 2 AMD Opetrons 6274 (32 cores), 64GB of >> memory, but dom0 runs on 16 cores and 32GB of memory. Hosts 5 linux >> domUs with similiar configs, each from 2 to 4 cores, from 1GB to 4GB of >> memory. DomU with all cores is Windows Server 2008R2 Enterprise with >> Terminal Services installed. >> > Mmm... nice setup! :-PThank you. It''s just one of four slots in 2U TWIN.> > Do you mind sending here the output of the following commands, to help > us picture the situation better? > > ~# xl info -n > ~# xl list -n > ~# xl vcpu-list > > If possible, run the following two too: > > ~# xl debug-key u > ~# xl dmesg > xl-dmesg.log > > And attach the xl-dmesg.log file.Attached.> > Of course, do all the above with all your domains up and running, and > after the re-weighting of the Win server. > >> When I set cpu-weight to 192 (others have 256 - default), it starts to >> lag. Applications became pretty slow and unstable. >> > You mean apps inside the Win server with 32 vCPUs or in general?Whole machine is slow. It behaves like old 386 PC when you disabled that TURBO button. Everything slowed down.> > Regards, > Dario >Thanks Jan _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users