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From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] [PATCH v2 1/5] linux-aio: queue requests that cannot be submitted |
Date: | Tue, 16 Dec 2014 21:26:54 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 |
> I could reproduce this very well on a random OS image that I had around. > This is raw over XFS over dm-crypt, and the image is about 75% sparse > (8.2G used over 35G). I only get 1-2%, but still it's visible. > > However I can hardly reproduce it when using a partition directly: > > old new > mean 9.9565 9.9636 (+0.07%) > stddev 0.0405 0.0537 > min 9.871 9.867 > median 9.973 9.971 > max 10.01 10.053 > count 20 20 > > I haven't tried removing layers (e.g. fully-allocated XFS image without > dm-crypt). Could not reproduce it with a fully-allocated XFS image, on the contrary the patched QEMU is a bit faster: old new mean 14.83325 14.82660 stddev 0.016930 0.010328 min 14.819 14.818 max 14.854 14.883 median 14.8225 14.8255 count 20 20 Paolo
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