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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



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