[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: RE: [Xen-devel] poor domU VBD performance.
Hi, On Mon, Mar 28, 2005 at 09:14:10PM +0100, Ian Pratt wrote: > > Is the second disk exactly the same as the first one? I'll > > try an IO test > > here on the same disk array with dom0 and domU and see what I get. > > I've reproduced the problem and its a real issue. > > It only affects reads, and is almost certainly down to how the blkback > driver passes requests down to the actual device. Two points to look at: * Block size (filesystems set this to 4k normally, default it 1k) * Read ahead (you need to do it, otherwise you end up doing tiny requests). You can tune it in sysfs. Regards, -- Kurt Garloff, Director SUSE Labs, Novell Inc. Attachment:
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