linux-kernel - Re: Tmem [PATCH 0/5] (Take 3): Transcendent memory

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Message-ID: <20091218080631.GA1374@ucw.cz>
Date:	Fri, 18 Dec 2009 09:06:31 +0100
From:	Pavel Machek <pavel@....cz>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	linux-kernel@...r.kernel.org, npiggin@...e.de, akpm@...l.org,
	jeremy@...p.org, xen-devel@...ts.xensource.com,
	tmem-devel@....oracle.com, kurt.hackel@...cle.com,
	Russell <rusty@...tcorp.com.au>, Rik van Riel <riel@...hat.com>,
	dave.mccracken@...cle.com, linux-mm@...ck.org,
	Rusty@...inet15.oracle.com, sunil.mushran@...cle.com,
	Avi Kivity <avi@...hat.com>,
	Schwidefsky <schwidefsky@...ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	alan@...rguk.ukuu.org.uk, chris.mason@...cle.com
Subject: Re: Tmem [PATCH 0/5] (Take 3): Transcendent memory

Hi!

> Performance is difficult to quantify because some benchmarks respond
> very favorably to increases in memory and tmem may do quite well on
> those, depending on how much tmem is available which may vary widely
> and dynamically, depending on conditions completely outside of the
> system being measured.  Ideas on how best to provide useful metrics
> would be appreciated.

So... take 1GB system, run your favourite benchmark. Then reserve
512MB for tmem, rerun your benchmark, then run the system with
512MB/512MB swap, rerun the benchmark?

Tune the sizes so that first to last run differ by 100% or so, and see
how much first and second differs? If it is in 1% range, you are
probably doing good...?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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