Re: [Xen-devel] [BUNDLE] Xen Share w/ block device

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Rusty Russell <rusty@xxxxxxxxxxxxxxx>

Subject:

Re: [Xen-devel] [BUNDLE] Xen Share w/ block device

From:

Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>

Date:

Fri, 17 Feb 2006 08:52:56 +0000

Cc:

Andrew Warfield <andrew.warfield@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx

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On 17 Feb 2006, at 07:22, Rusty Russell wrote:

I don't doubt that better memory performance can be achieved by
adjusting event notification frequency/batching -- as you pointed out
earlier... but block devices are a pretty weird place to try to win.
I'd expect the numbers from the two tests you're running to be
identical -- and bottlenecked on the disk.  By a lot.


Hmm, my dom0 only has 128MB of RAM, and my dom1 64MB.  Wonder if I'm
getting bad behaviour due to small amounts of memory?

I was just happy to get my code working, but I'll dig deeper next week.

Perhaps one backend is hitting the buffer cache and the other isbypassing it?


 -- Keir


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