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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 12:06:38 +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 05/19/2010 12:01 PM, Stefan Hajnoczi wrote:
On Wed, May 19, 2010 at 9:09 AM, Avi Kivity<address@hidden> wrote:On 05/18/2010 10:22 PM, Stefan Hajnoczi wrote:What cache= mode are you running?writeback.In the cache=writeback case the virtio-blk guest driver does: blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH, ...)
I don't follow. What's the implication?btw I really dislike how the cache attribute (which I see as a pure host choice) is exposed to the guest. It means we can't change caching mode on the fly (for example after live migration), or that changing caching mode during a restart may expose a previously hidden guest bug.
-- Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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