From: Jamie Lokier <jamie@shareable.org>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Christoph Hellwig <hch@lst.de>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 1/4] block: add enable_write_cache flag
Date: Mon, 31 Aug 2009 23:59:25 +0100 [thread overview]
Message-ID: <20090831225925.GG24318@shareable.org> (raw)
In-Reply-To: <4A9C5463.4090904@codemonkey.ws>
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
next prev parent reply other threads:[~2009-08-31 22:59 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-31 20:16 [Qemu-devel] [PATCH 0/4] data integrity fixes Christoph Hellwig
2009-08-31 20:16 ` [Qemu-devel] [PATCH 1/4] block: add enable_write_cache flag Christoph Hellwig
2009-08-31 22:09 ` Jamie Lokier
2009-08-31 22:16 ` Christoph Hellwig
2009-08-31 22:46 ` Jamie Lokier
2009-08-31 23:06 ` Christoph Hellwig
2009-09-01 10:38 ` Jamie Lokier
2009-08-31 22:53 ` Anthony Liguori
2009-08-31 22:55 ` Jamie Lokier
2009-08-31 22:58 ` Christoph Hellwig
2009-08-31 22:59 ` Jamie Lokier [this message]
2009-08-31 23:06 ` Christoph Hellwig
2009-08-31 23:09 ` Christoph Hellwig
2009-09-02 3:53 ` Christoph Hellwig
2009-09-02 13:13 ` Anthony Liguori
2009-09-02 14:14 ` Christoph Hellwig
2009-09-02 19:49 ` Christoph Hellwig
2009-08-31 20:17 ` [Qemu-devel] [PATCH 2/4] block: use fdatasync instead of fsync Christoph Hellwig
2009-08-31 21:51 ` Jamie Lokier
2009-08-31 21:55 ` Christoph Hellwig
2009-08-31 22:48 ` Jamie Lokier
2009-08-31 22:57 ` Christoph Hellwig
2009-09-01 15:59 ` Blue Swirl
2009-09-01 16:04 ` Christoph Hellwig
2009-09-02 0:34 ` Jamie Lokier
2009-09-02 0:37 ` Christoph Hellwig
2009-09-02 1:18 ` Jamie Lokier
2009-09-02 14:02 ` Blue Swirl
2009-09-02 14:15 ` Christoph Hellwig
2009-08-31 20:17 ` [Qemu-devel] [PATCH 3/4] block: add bdrv_aio_flush operation Christoph Hellwig
2009-09-01 10:24 ` Avi Kivity
2009-09-01 14:25 ` Christoph Hellwig
2009-08-31 20:18 ` [Qemu-devel] [PATCH 4/4] virtio-blk: add volatile writecache feature Christoph Hellwig
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