[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] poor domU VBD performance.
There have been some changes to the frontend driver too: you might want to try using the 2.0-testing kernel in domU too. Also, a really nasty CPU performance bug got fixed earlier this evening, so you should make sure you have the latest tree. Ian > > I just ran again, and for some reason it looks fine now... > I have no > > idea what I did to get the lower numbers initially, perhaps an > > inadvertant IO scheduler change. Service commit times are > .28ms and I > > can drive ~58MB/sec with just 16k requests on xen0. I'll > do some more > > tests to get a more consistent picture. > > > > I still experience bad performance in domU with latest > xen-testing dom0. > > Here's my setup : > > Xen : 2.0.5 > Dom0 : 2.6.11-xen-testing (20050401 ~22h CEST) running Debian > Sarge DomU : 2.6.10-xen-2.0.5 (8G LVM backed VBDs exported as > hda1) running Gentoo Processor : AthlonXP 1800+ Chipset : VIA > KT600 Drive : Seagate ST380013AS 80G SATA > > And my results : > > Dom0 : 51 MB/s > DomU : 36 MB/s > > I've tried with request sizes from 128k to 1024k reading > entire volume and obtained always same results. > Changing the scheduler on Dom0 and/or DomU doesn't change anything. > > I can give you more info if nedded. > > -- > Cédric Schieli > > _______________________________________________ > 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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