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Re: [Qemu-devel] [PATCH] cpus: reset throttle_thread_scheduled after sle
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH] cpus: reset throttle_thread_scheduled after sleep |
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Date: |
Thu, 25 May 2017 18:34:15 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 |
On 25/05/2017 18:25, Felipe Franciosi wrote:
> The perfect solution (for this throttling strategy) would probably be
> a per-cpu timer. In the meantime, I think avoiding massive sleeps is
> a win. We observed stalls in excess of 70 secs at 99% throttle.
Ah, so the issue is not overcommit, it's too high throttling. Then it
makes sense.
Thanks,
Paolo
>> How overcommitted was the host system?
> Not overcommitted at all. And it's quite easy to reproduce. All you
> need is a workload heavy enough to prevent the migration from
> converging (or a slow network which you can emulate with a qdisc).
>
> With a Linux guest, you should quickly see soft lockups being
> reported. With Windows, probably BSODs.