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Re: [Qemu-devel] [PATCH] qcow2: Drop synchronous qcow_write()
From: |
Christoph Hellwig |
Subject: |
Re: [Qemu-devel] [PATCH] qcow2: Drop synchronous qcow_write() |
Date: |
Mon, 18 May 2009 13:59:04 +0200 |
User-agent: |
Mutt/1.3.28i |
On Wed, May 13, 2009 at 01:08:38PM +0200, Kevin Wolf wrote:
> Christoph Hellwig schrieb:
> > Looks good to me, that strary qcow2_write irked me, too. Do you plan
> > to kill qcow_read, too?
>
> Hm, haven't planned that because qcow_read() is used in a much more
> common code path, but in theory the very same approach should work there
> (and someone seems to have done this already for qcow1?).
>
> Don't know how the emulation behaves performance wise though,
> qcow_read() is used for each cluster allocation. I guess the difference
> is negligible?
Good question. Probably needs some benchmarking first.