linux-kernel - RE: [PATCH] 4/4 block: explicit plugging

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Date:	Fri, 5 Jan 2007 14:04:19 -0800
From:	"Chen, Kenneth W" <kenneth.w.chen@...el.com>
To:	"'Jens Axboe'" <jens.axboe@...cle.com>
Cc:	"Andrew Morton" <akpm@...l.org>, <linux-kernel@...r.kernel.org>,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Nick Piggin" <npiggin@...e.de>
Subject: RE: [PATCH] 4/4 block: explicit plugging

Andrew Morton wrote on Wednesday, January 03, 2007 12:09 AM
> Do you have any benchmarks which got faster with these changes?

Jens Axboe wrote on Wednesday, January 03, 2007 12:22 AM
> I've asked Ken to run this series on some of his big iron, I hope he'll
> have some results for us soonish. I can run some pseudo benchmarks on a
> 4-way here with some simulated storage to demonstrate the locking
> improvements.

> Jens Axboe wrote on Thursday, January 04, 2007 6:39 AM
> > I will just retake the tip of your plug tree and retest.
> 
> That would be great! There's a busy race fixed in the current branch,
> make sure that one is included as well.


Good news: the tip of plug tree fixed the FC loop reset issue we are
seeing earlier.

Performance wise, our big db benchmark run came out with 0.14% regression
compare to 2.6.20-rc2.  It is small enough that we declared it as noise
level change. Unfortunately our internal profile tool broke on 2.6.20-rc2
so I don't have an execution profile to post.

- Ken
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