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From: Paolo Bonzini <pbonzini@redhat.com>
To: Kevin Wolf <kwolf@redhat.com>
Cc: ming.lei@canonical.com, pl@kamp.de, qemu-devel@nongnu.org,
	stefanha@redhat.com
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	[thread overview]
Message-ID: <5490958E.8030803@redhat.com> (raw)
In-Reply-To: <549079CC.4010109@redhat.com>


> 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

  reply	other threads:[~2014-12-16 20:27 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-11 13:52 [Qemu-devel] [PATCH v2 0/5] linux-aio: rewrite and simplify queuing code Paolo Bonzini
2014-12-11 13:52 ` [Qemu-devel] [PATCH v2 1/5] linux-aio: queue requests that cannot be submitted Paolo Bonzini
2014-12-16 11:07   ` Kevin Wolf
2014-12-16 11:28     ` Paolo Bonzini
2014-12-16 13:10       ` Kevin Wolf
2014-12-16 18:28         ` Paolo Bonzini
2014-12-16 20:26           ` Paolo Bonzini [this message]
2014-12-17 12:34             ` Paolo Bonzini
2014-12-17 15:03               ` Paolo Bonzini
2014-12-11 13:52 ` [Qemu-devel] [PATCH v2 2/5] linux-aio: track whether the queue is blocked Paolo Bonzini
2014-12-11 13:52 ` [Qemu-devel] [PATCH v2 3/5] linux-aio: rename LaioQueue idx field to "n" Paolo Bonzini
2014-12-11 13:52 ` [Qemu-devel] [PATCH v2 4/5] linux-aio: drop return code from laio_io_unplug and ioq_submit Paolo Bonzini
2014-12-11 13:52 ` [Qemu-devel] [PATCH v2 5/5] linux-aio: simplify removal of completed iocbs from the list Paolo Bonzini
2014-12-11 14:49 ` [Qemu-devel] [PATCH v2 0/5] linux-aio: rewrite and simplify queuing code Kevin Wolf
2014-12-12 17:07 ` Stefan Hajnoczi

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