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Re: [Qemu-block] [Qemu-devel] [PATCH 1/3] blockjob: Introduce block_job_
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-block] [Qemu-devel] [PATCH 1/3] blockjob: Introduce block_job_relax_cpu |
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Date: |
Tue, 14 Jul 2015 13:31:31 +0100 |
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User-agent: |
Mutt/1.5.23 (2014-03-12) |
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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[Qemu-block] [PATCH 2/3] mirror: Use block_job_relax_cpu during bitmap scanning, Fam Zheng, 2015/07/08
[Qemu-block] [PATCH 3/3] mirror: Speed up bitmap initial scanning, Fam Zheng, 2015/07/08
Re: [Qemu-block] [Qemu-devel] [PATCH 0/3] mirror: Fix guest responsiveness during bitmap scan, Alexandre DERUMIER, 2015/07/09
Re: [Qemu-block] [PATCH 0/3] mirror: Fix guest responsiveness during bitmap scan, Stefan Hajnoczi, 2015/07/09