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Re: [Qemu-devel] [Qemu-block] [PATCH 1/3] blockjob: Introduce block_job_

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [Qemu-block] [PATCH 1/3] blockjob: Introduce block_job_relax_cpu
Date: Tue, 14 Jul 2015 13:31:31 +0100
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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