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Re: [Qemu-devel] [PATCH] block/throttle: Use host clock type

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH] block/throttle: Use host clock type
Date: Fri, 13 Mar 2015 13:28:38 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 13/03/2015 13:23, Alberto Garcia wrote:
> On Fri, Mar 13, 2015 at 02:35:29PM +0800, Fam Zheng wrote:
>> Throttle timers won't make any progress when VCPU is not running,
>> which is prone to stall the request queue in cases like utils,
>> qtest, suspending, and live migration, unless carefully handled.
> Yes, this can be easily reproduced by stopping the VM and starting a
> block-commit job. If the I/O in that device is throttled then the job
> will be stalled.

That may be a different bug.  Should jobs be subject to throttling at all?


> Then there's also the situation that we discussed in IRC: if the
> block-commit job is ongoing and then we stop the VM, then the rest of
> the data will be committed bypassing the throttling settings.  But
> that's not related to these changes.
>> Signed-off-by: Fam Zheng <address@hidden>
>> ---
>>  block.c               |  2 +-
>>  tests/test-throttle.c | 14 +++++++-------
>>  2 files changed, 8 insertions(+), 8 deletions(-)
> Reviewed-By: Alberto Garcia <address@hidden>
> Berto

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