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Date: Wed, 27 Feb 2002 11:57:57 -0800
From: Hanna Linder <hannal@us.ibm.com>
To: Andrew Morton <akpm@zip.com.au>,
        "Martin J. Bligh" <Martin.Bligh@us.ibm.com>
cc: Hanna Linder <hannal@us.ibm.com>, linux-kernel@vger.kernel.org,
        lse-tech@lists.sourceforge.net, viro@math.psu.edu
Subject: Re: [Lse-tech] lockmeter results comparing 2.4.17, 2.5.3, and 2.5.5
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--On Wednesday, February 27, 2002 11:45:15 -0800 Andrew Morton <akpm@zip.com.au> wrote:

> The big one is lru_list_lock, of course.  I'll be releasing code in
> the next couple of days which should take that off the map.  Testing
> would be appreciated.

	Ill be glad to run this again with your patch. Also, John Hawkes
has an even bigger system and keeps hitting lru_list_lock too.
> 
> I have a concern about the lockmeter results.  Lockmeter appears
> to be measuring lock frequency and hold times and contention.  But
> is it measuring the cost of the cacheline transfers?   

	This has come up a few times on lse-tech. Lockmeter doesnt
measure cacheline hits/misses/bouncing. However, someone said
kernprof could be used to access performance registers on the Pentium
chip to get this info. I don't know anyone who has tried that though.
	I am working on a patch to decrease cacheline bouncing and it
would be great to see some specific results. Is anyone working on a tool 
that could measure cache hits/misses/bouncing?

Hanna



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