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xen-devel
Re: Performance data of Linux native vs. Xen Dom0 and Xen DomU. Re: [Xen
George Dunlap wrote:
> One of the strange things, though, is that the difference should be so
> big between domU and dom0, which are using the exact same same kernel
> (correct me if I'm wrong).
>
> I'm not familiar with the I/O scheduling. Is it possible that the I/O
> scheduling inside the domU is interacting poorly with the I/O
> scheduling in dom0? That's one hypothesis for why domU writes are
> slower than dom0 writes; but that doesn't seem to explain why domU
> reads would be *faster* than dom0 reads.
>
> -George
Correct me if I'm wrong, but wouldn't a file-backed block device for the
domU be reading from memory if it's cached in the dom0? That would be a
bit faster.
Also, in the past it seemed the domU schedulers were ignored and were
implicitly noop, relying on the dom0's scheduler (which did all of the
real I/O.) Has this changed?
--
Christopher G. Stach II
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