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Re: [Qemu-devel] [PATCH 1/4] block: add enable_write_cache flag

From: Jamie Lokier
Subject: Re: [Qemu-devel] [PATCH 1/4] block: add enable_write_cache flag
Date: Mon, 31 Aug 2009 23:59:25 +0100
User-agent: Mutt/1.5.13 (2006-08-11)

Anthony Liguori wrote:
> Can someone do some benchmarking with cache=writeback and fdatasync 
> first and quantify what the real performance impact is?

Unfortunately we can't yet quantify the impact on the hardware I care
about (ordinary consumer PCs with non-NCQ SATA disks), because Linux
hosts don't *yet* implement O_SYNC or fdatasync properly.

I would expect the performance difference to be much more significant
after those are implemented on the host.

-- Jamie

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