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Re: [Qemu-devel] Confusing I/O throttling behavior with burst_length > 1
From: |
Alberto Garcia |
Subject: |
Re: [Qemu-devel] Confusing I/O throttling behavior with burst_length > 1 and max < avg |
Date: |
Tue, 26 Jul 2016 14:38:43 +0200 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Thu, Jul 14, 2016 at 01:18:19PM +0100, Stefan Hajnoczi wrote:
> The following throttling behavior was observed with bps=512000
> bps_max=51200 throttling.bps-total-max-length=2:
>
> READ: io=512KB, aggrb=50KB/s, minb=50KB/s, maxb=50KB/s, mint=10061msec,
> maxt=10061msec
>
> If bps-total-max-length=1 then the result is different:
>
> READ: io=5056KB, aggrb=505KB/s, minb=505KB/s, maxb=505KB/s, mint=10006msec,
> maxt=10006msec
>
> The burst limits guest bps instead of adding on top of it when
> burst_length > 1.
Thanks Stefan,
I think we should forbid that kind of setup altogether. I wrote a few
more details in the bug report:
> https://bugzilla.redhat.com/show_bug.cgi?id=1355665
I can write the patch.
Berto