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[Qemu-devel] Re: [PATCH +stable] block: don't attempt to merge overlappi
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From: |
Stefan Hajnoczi |
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Subject: |
[Qemu-devel] Re: [PATCH +stable] block: don't attempt to merge overlapping requests |
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Date: |
Tue, 18 May 2010 20:22:43 +0100 |
On Tue, May 18, 2010 at 6:18 PM, Avi Kivity <address@hidden> wrote:
> The block multiwrite code pretends to be able to merge overlapping requests,
> but doesn't do so in fact. This leads to I/O errors (for example on mkfs
> of a large virtio disk).
Are overlapping write requests correct guest behavior? I thought the
ordering semantics require a flush between overlapping writes to
ensure A is written before B.
What cache= mode are you running?
Stefan