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Re: [Qemu-devel] [PATCH 1/3] FVD: Added support for 'qemu-img update'


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH 1/3] FVD: Added support for 'qemu-img update'
Date: Tue, 1 Feb 2011 13:53:11 +0000

On Mon, Jan 31, 2011 at 2:49 PM, Chunqiang Tang <address@hidden> wrote:
> The paper [2] below from VMware is informative but cannot be adopted by us
> directly, as the problem domain is different. I previously had a paper on
> general congestion control,
> https://sites.google.com/site/tangchq/papers/NCI-USENIX09.pdf?attredirects=0
> , and attended a conference together with an author of paper [2] , and had
> some discussions. It is an interesting paper.
>
> [1] http://suif.stanford.edu/papers/nsdi05.pdf .
> [2] http://www.usenix.org/events/fast09/tech/full_papers/gulati/gulati.pdf

Thanks for the links, I will take a look.  I can see both latency and
throughput being problematic.  With throughput the problem is that the
I/O pattern may be sporadic or bursty.  It's hard for a heuristic to
follow large changes in the guest's I/O pattern.

Stefan



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