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Re: [Qemu-devel] [RFC] Disk integrity in QEMU

From: Paul Brook
Subject: Re: [Qemu-devel] [RFC] Disk integrity in QEMU
Date: Fri, 10 Oct 2008 13:53:31 +0100
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> But that said, I'm concerned that this is far too confusing for users.
> I don't think anyone is relying on disk write performance when in
> write-back mode simply because the guest already has a page cache so
> writes are already being completed instantaneously from the
> application's perspective.

This isn't entirely true. With IDE devices you don't have command queueing, so 
it's easy for a large write to stall subsequent reads for a relatively long 
I'm not sure how much this effects qemu, but I've definitely seen it happening 
on real hardware.


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