[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Credit Scheduler not working correct (3.0.4-0)
Ok so If I get this right, what you want to do is have 2 UP guests with different weights. You also want to turn off HT and you do this by pinning both guests on CPU 0. Credit accounting and pinning VCPUs don't always interact well and I suspect you're hitting such a problem here. If you have access to the Xen console, can you send output of the 'r' (runq) key while your domains are each getting 50% of CPU? Just take a few snapshots a few seconds apart. That would confirm the theory. Also, setting cap=100 on a UP guest is pointless. Just leave it as zero. A VCPU isn't going to get more than 100% of a physical CPU anyway. On Feb 1, 2007, at 10:47, Timo Benk wrote: Hi,on my system, it seems that the credit scheduler does not work as expected. The problem seems to be related to HyperThreading, if i switch off HT in the BIOSSetup, the scheduler works as expected. I have two domains running, both pinned to the same processor: Domain-0:~ # xm vcpu-list Name ID VCPU CPU State Time(s) CPU AffinityDomain-0 0 0 1 --- 30.2 any cpu Domain-0 0 1 1 r-- 12.0 any cpuxendom1 1 0 0 --- 98.6 0 xendom2 2 0 0 r-- 110.3 0 Both domains should consume max. 100 Percent of that processor, but xendom1 has a weight twice as big as xendom2: Domain-0:~ # xm sched-credit -d xendom1 {'cap': 100, 'weight': 200} Domain-0:~ # xm sched-credit -d xendom2 {'cap': 100, 'weight': 100}In my understanding of the credit scheduler, xendom1 should get twice asmuch CPU-time as xendom2. But: xentop - 11:05:46 Xen 3.0.4-0 Mem: 2612284k total, 2603852k used, 8432k free CPUs: 2 @ 2992MHz NAME STATE CPU(sec) CPU(%) [...] Domain-0 -----r 42 0.6 [...] xendom1 ------ 122 49.8 [...] xendom2 -----r 133 50.2 [...] As you can see, both domains got an equal amount of the CPU. Am i missing something or do i understand something wrong? Greetings, -timo -- Timo Benk - Jabber ID: fry@xxxxxxxxxxxx - ICQ ID: #414944731 PGP Public Key: http://m28s01.vlinux.de/timo_benk_gpg_key.asc _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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