Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio blockdevice

[Christoph Hellwig]

On Fri, Jul 29, 2011 at 03:59:53PM +0800, Liu Yuan wrote:
> I noted bdrv_aio_multiwrite() do the murging job, but  I am not sure

Just like I/O schedulers it's actually fairly harmful on high IOPS,
low latency devices.  I've just started doing a lot of qemu bencharks,
and disabling that multiwrite mess alone gives fairly nice speedups.

The major issue seems to be additional memory allocations and cache
lines - a problem that actually is fairly inherent all over the qemu
code.

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