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From: | Avi Kivity |
Subject: | [Qemu-devel] Re: [PATCH +stable] block: don't attempt to merge overlapping requests |
Date: | Wed, 19 May 2010 11:09:07 +0300 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4 |
On 05/18/2010 10:22 PM, Stefan Hajnoczi wrote:
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?
writeback. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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