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xen-devel
Re: [Xen-devel] Re: [PATCH v3] xen block backend.
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To: |
Ian Campbell <Ian.Campbell@xxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] Re: [PATCH v3] xen block backend. |
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From: |
Christoph Hellwig <hch@xxxxxxxxxxxxx> |
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Date: |
Thu, 21 Apr 2011 04:04:12 -0400 |
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Cc: |
"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, "jaxboe@xxxxxxxxxxxx" <jaxboe@xxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, "konrad@xxxxxxxxxx" <konrad@xxxxxxxxxx> |
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Thu, 21 Apr 2011 01:05:49 -0700 |
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<1303333543-5915-1-git-send-email-konrad.wilk@xxxxxxxxxx> <20110421033735.GA11501@xxxxxxxxxxxxx> <1303370925.5997.322.camel@xxxxxxxxxxxxxxxxxxxxxx> |
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Mutt/1.5.21 (2010-09-15) |
On Thu, Apr 21, 2011 at 08:28:45AM +0100, Ian Campbell wrote:
> On Thu, 2011-04-21 at 04:37 +0100, Christoph Hellwig wrote:
> > This should sit in userspace. And last time was discussed the issue
> > Stefano said the qemu Xen disk backend is just as fast as this kernel
> > code. And that's with an not even very optimized codebase yet.
>
> Stefano was comparing qdisk to blktap. This patch is blkback which is a
> completely in-kernel driver which exports raw block devices to guests,
> e.g. it's very useful in conjunction with LVM, iSCSI, etc. The last
> measurements I heard was that qdisk was around 15% down compared to
> blkback.
Please show real numbers on why adding this to kernel space is required.
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