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Re: [Qemu-devel] [RFC][PATCH 10/16 v6] run dump at the background


From: Wen Congyang
Subject: Re: [Qemu-devel] [RFC][PATCH 10/16 v6] run dump at the background
Date: Wed, 15 Feb 2012 11:47:20 +0800
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100413 Fedora/3.0.4-2.fc13 Thunderbird/3.0.4

At 02/15/2012 02:27 AM, Jan Kiszka Wrote:
> On 2012-02-14 19:05, Jan Kiszka wrote:
>> On 2012-02-09 04:28, Wen Congyang wrote:
>>> The new monitor command dump may take long time to finish. So we need run it
>>> at the background.
>>
>> How does it work? Like live migration, i.e. you retransmit (overwrite)
>> already written but then dirtied pages? Hmm... no.
>>
>> What does background mean then? What is the use case? What if the user
>> decides to resume the vm?
> 
> OK, that is addressed in patch 15! I would suggest merging it into this
> patch. It makes sense to handle that case gracefully right from the
> beginning.

OK, I will merge it.

> 
> OK, now I have some other question: What is the point of rate-limiting
> the dump? The guest is not running, thus not competing for bandwidth.

I use bandwidth to try to control the writing speed. If we write the vmcore
to disk in a high speed, it may affect some other appilications which use
the same disk too.

Thanks
Wen Congyang

> 
> Jan
> 




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