From: Paolo Bonzini <pbonzini@redhat.com>
To: Dmitry Monakhov <dmonakhov@openvz.org>,
"Denis V. Lunev" <den@odin.com>,
Stefan Hajnoczi <stefanha@gmail.com>
Cc: Dmitry Monakhov <dmonakhov@odin.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
qemu-block@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign
Date: Mon, 01 Jun 2015 12:41:00 +0200 [thread overview]
Message-ID: <556C36BC.1000409@redhat.com> (raw)
In-Reply-To: <877frn90pz.fsf@openvz.org>
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On 01/06/2015 12:34, Dmitry Monakhov wrote:
> Yes. Improvement is not huge, but it can be detected for old qemu
> unpatched kernel: 728 MiB/sec ± 20Mb patched kernel : 748 MiB/sec
> ± 10Mb
Ok, so about 3-4%. What does the blktrace look like with a patched
kernel, and what is the performance with old QEMU?
Paolo
> IMHO patch is not sufficient. We have to correct bio construction
> inside direct-io code. I'll be back with the patch.
next prev parent reply other threads:[~2015-06-01 10:41 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-04 13:42 [Qemu-devel] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign Denis V. Lunev
2015-05-04 13:42 ` [Qemu-devel] [PATCH 1/2] block: minimal bounce buffer alignment Denis V. Lunev
2015-05-04 13:42 ` [Qemu-devel] [PATCH 2/2] block: align bounce buffers to page Denis V. Lunev
2015-05-11 14:54 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
2015-05-11 15:32 ` Eric Blake
2015-05-11 15:40 ` Denis V. Lunev
2015-05-11 15:08 ` [Qemu-devel] [Qemu-block] [PATCH v5 0/2] block: enforce minimal 4096 alignment in qemu_blockalign Stefan Hajnoczi
2015-05-11 16:07 ` Denis V. Lunev
2015-05-11 16:38 ` Denis V. Lunev
2015-05-11 16:47 ` Denis V. Lunev
2015-05-12 10:01 ` Stefan Hajnoczi
2015-05-12 10:19 ` Denis V. Lunev
2015-05-12 10:46 ` Paolo Bonzini
2015-05-13 15:43 ` Stefan Hajnoczi
2015-05-13 16:46 ` Denis V. Lunev
2015-05-29 16:43 ` [Qemu-devel] " Paolo Bonzini
2015-06-01 10:34 ` Dmitry Monakhov
2015-06-01 10:41 ` Paolo Bonzini [this message]
2015-06-01 11:16 ` Dmitry Monakhov
2015-06-01 11:26 ` Paolo Bonzini
2015-06-01 11:57 ` Dmitry Monakhov
2015-05-14 9:13 ` [Qemu-devel] [Qemu-block] " Paolo Bonzini
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