From: Stefan Hajnoczi <stefanha@gmail.com>
To: Alexandre DERUMIER <aderumier@odiso.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <famz@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>,
qemu-block@nongnu.org
Subject: Re: [Qemu-devel] [Qemu-block] [PATCH 1/3] blockjob: Introduce block_job_relax_cpu
Date: Tue, 14 Jul 2015 13:31:31 +0100 [thread overview]
Message-ID: <20150714123131.GM17927@stefanha-thinkpad.redhat.com> (raw)
In-Reply-To: <1233193551.9344767.1436499768115.JavaMail.zimbra@oxygem.tv>
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On Fri, Jul 10, 2015 at 05:42:48AM +0200, Alexandre DERUMIER wrote:
> >>By the way, why did you choose 10 milliseconds? That is quite long.
> >>
> >>If this function is called once per 10 ms disk I/O operations then we
> >>lose 50% utilization. 1 ms or less would be reasonable.
>
> From my tests, 1ms is not enough, It still hanging in guest or qmp queries.
> 10ms give me optimal balance between bitmap scan speed and guest responsiveness.
Then I don't fully understand the bug.
Fam: can you explain why 1ms isn't enough?
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next prev parent reply other threads:[~2015-07-14 12:31 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-09 3:47 [Qemu-devel] [PATCH 0/3] mirror: Fix guest responsiveness during bitmap scan Fam Zheng
2015-07-09 3:47 ` [Qemu-devel] [PATCH 1/3] blockjob: Introduce block_job_relax_cpu Fam Zheng
2015-07-09 12:54 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
2015-07-10 3:42 ` Alexandre DERUMIER
2015-07-14 12:31 ` Stefan Hajnoczi [this message]
2015-07-15 10:32 ` Fam Zheng
2015-07-16 13:21 ` Stefan Hajnoczi
2015-07-09 3:47 ` [Qemu-devel] [PATCH 2/3] mirror: Use block_job_relax_cpu during bitmap scanning Fam Zheng
2015-07-09 13:00 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
2015-07-09 3:47 ` [Qemu-devel] [PATCH 3/3] mirror: Speed up bitmap initial scanning Fam Zheng
2015-07-09 13:00 ` Stefan Hajnoczi
2015-07-14 13:21 ` Stefan Hajnoczi
2015-07-09 11:51 ` [Qemu-devel] [PATCH 0/3] mirror: Fix guest responsiveness during bitmap scan Alexandre DERUMIER
2015-07-09 13:02 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
2015-07-09 13:18 ` Alexandre DERUMIER
2015-07-10 6:43 ` Fam Zheng
2015-07-10 6:54 ` Alexandre DERUMIER
2015-07-10 7:13 ` Fam Zheng
2015-07-10 10:36 ` Alexandre DERUMIER
2015-07-10 12:16 ` Alexandre DERUMIER
2015-07-13 5:08 ` Fam Zheng
2015-07-14 12:40 ` Stefan Hajnoczi
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