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Re: [Xen-devel] qemu VS tapdisk2 VS blkback benchmarks

from [Stefano Stabellini] [Permanent Link][Original]
To: Shriram Rajagopalan <rshriram@xxxxxxxxx>
Subject: Re: [Xen-devel] qemu VS tapdisk2 VS blkback benchmarks
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Mon, 13 Dec 2010 13:45:14 +0000
Cc: Daniel Stodden <Daniel.Stodden@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
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On Sat, 11 Dec 2010, Shriram Rajagopalan wrote:
> I am assuming when you said "blkback over lvm", you
> used "phy:/dev/..." format.
> do you have any figures on tapdisk2 over lvm?
> [wherein you would use "tap2:aio:/dev/..." ]

About 37MB/s.

However both tapdisk2 and qemu performances on lvm seem to degrade after
the first 100MB of data transfer to less than 30 MB/s, not sure why.

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