From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Lieven <pl@kamp.de>
Cc: kwolf@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com
Subject: Re: [Qemu-devel] [PATCH 1.8 5/6] qemu-img: add option to align writes to cluster_sectors during convert
Date: Mon, 25 Nov 2013 17:02:27 +0100 [thread overview]
Message-ID: <52937493.9040109@redhat.com> (raw)
In-Reply-To: <529372FB.4070403@kamp.de>
Il 25/11/2013 16:55, Peter Lieven ha scritto:
>>
> chaning sparse_size from 65536 to 1048576 about 5% performance decrease...
>
> lieven@lieven-pc:~/git/qemu$ time ./qemu-img convert -pp -m 15728640 -S
> 1048576 /tmp/VC-Ubuntu-LTS-12.04.2-64bit.qcow2
> iscsi://172.21.200.45/iqn.2001-05.com.equallogic:0-8a0906-9d95c510a-344001d54795289f-2012-r2-1-7-0/0
>
> 40980480 of 40980480 sectors converted.
>
> real 0m29.263s
> user 0m7.544s
> sys 0m1.636s
> lieven@lieven-pc:~/git/qemu$ time ./qemu-img convert -pp -m 15728640 -S
> 4096 /tmp/VC-Ubuntu-LTS-12.04.2-64bit.qcow2
> iscsi://172.21.200.45/iqn.2001-05.com.equallogic:0-8a0906-9d95c510a-344001d54795289f-2012-r2-1-7-0/0
>
> 40980480 of 40980480 sectors converted.
>
> real 0m28.169s
> user 0m7.792s
> sys 0m1.516s
> lieven@lieven-pc:~/git/qemu$ time ./qemu-img convert -pp -m 15728640 -S
> 65536 /tmp/VC-Ubuntu-LTS-12.04.2-64bit.qcow2
> iscsi://172.21.200.45/iqn.2001-05.com.equallogic:0-8a0906-9d95c510a-344001d54795289f-2012-r2-1-7-0/0
>
> 40980480 of 40980480 sectors converted.
>
> real 0m27.643s
> user 0m7.644s
> sys 0m1.520s
>
> i wouldn't go over 64k until we fully understand which impact it has.
I agree.
Paolo
next prev parent reply other threads:[~2013-11-25 16:02 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-25 13:57 [Qemu-devel] [PATCH 1.8 0/6] qemu-img convert optimizations Peter Lieven
2013-11-25 13:57 ` [Qemu-devel] [PATCH 1.8 1/6] qemu-img: add support for skipping zeroes in input during convert Peter Lieven
2013-11-25 13:57 ` [Qemu-devel] [PATCH 1.8 2/6] qemu-img: fix usage instruction for qemu-img convert Peter Lieven
2013-11-25 17:21 ` Eric Blake
2013-11-26 7:01 ` Peter Lieven
2013-11-25 13:57 ` [Qemu-devel] [PATCH 1.8 3/6] qemu-img: add option to specify alternate iobuffer size Peter Lieven
2013-11-25 14:54 ` Paolo Bonzini
2013-11-25 15:01 ` Peter Lieven
2013-11-25 15:07 ` Peter Lieven
2013-11-25 15:14 ` Paolo Bonzini
2013-11-25 15:24 ` Peter Lieven
2013-11-25 15:48 ` Paolo Bonzini
2013-11-25 15:56 ` Peter Lieven
2013-11-25 13:57 ` [Qemu-devel] [PATCH 1.8 4/6] block/iscsi: set bdi->cluster_size Peter Lieven
2013-11-25 14:51 ` Paolo Bonzini
2013-11-25 15:02 ` Paolo Bonzini
2013-11-25 13:57 ` [Qemu-devel] [PATCH 1.8 5/6] qemu-img: add option to align writes to cluster_sectors during convert Peter Lieven
2013-11-25 15:11 ` Paolo Bonzini
2013-11-25 15:32 ` Peter Lieven
2013-11-25 15:50 ` Paolo Bonzini
2013-11-25 15:55 ` Peter Lieven
2013-11-25 16:02 ` Paolo Bonzini [this message]
2013-11-25 16:11 ` Peter Lieven
2013-11-25 16:34 ` Paolo Bonzini
2013-11-25 13:57 ` [Qemu-devel] [PATCH 1.8 6/6] qemu-img: add option to show progress in sectors Peter Lieven
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