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Date:	Mon, 26 Oct 2009 18:20:12 +0100
From:	Jan Kara <>
Cc:	LKML <>,
	Jeff Moyer <>,
	Chris Mason <>,
	Andrew Morton <>,
	Mike Galbraith <>
Subject: Performance regression in IO scheduler still there


  I took time and remeasured tiobench results on recent kernel. A short
conclusion is that there is still a performance regression which I reported
few months ago. The machine is Intel 2 CPU with 2 GB RAM and plain SATA
drive. tiobench sequential write performance numbers with 16 threads:
2.6.29:              AVG       STDERR
37.80 38.54 39.48 -> 38.606667 0.687475

37.36 36.41 36.61 -> 36.793333 0.408928 

So about 5% regression. The regression happened sometime between 2.6.29 and
2.6.30 and stays the same since then... With deadline scheduler, there's
no regression. Shouldn't we do something about it?

Jan Kara <>
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