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Date: Tue, 16 Jul 2002 17:31:57 +0100
To: Andrew Theurer <habanero@us.ibm.com>
Cc: Kevin Corry <corryk@us.ibm.com>, linux-lvm@sistina.com,
       linux-kernel@vger.kernel.org
Subject: Re: [linux-lvm] Re: [Announce] device-mapper beta3 (fast snapshots)
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From: Joe Thornber <joe@fib011235813.fsnet.co.uk>
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Andrew,

On Tue, Jul 16, 2002 at 11:05:49AM -0500, Andrew Theurer wrote:
> at 32k all the time?  That would explain why these results are flat, while I
> am getting a wider range.

I think this is a red herring, the chunk size code did accidentally
get backed out of CVS for a while.  But variable chunk sizes were
certainly going into the kernel when we did the development.

> Joe, are you absolutely sure these tests had the disk cache disabled?  That's
> the only hardware thing I can think of that would make a difference.

Absolutely sure.  Those figures were for a pair of PVs that were
sharing an IDE cable so I can certainly get things moving faster.

> It seems we can go 'round and 'round to no end, as long as we have HW
> differences, so I have asked for use on a OSDL system we can both run on.
> This way there is no difference in our HW.  I'll let you know when I hear
> back from them, so we can both test on the same system (if you want to).

Excellent idea, we should probably think up some better benchmarks too.

- Joe
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