linux-kernel - Re: [PATCHES] improve sysfs performance, make it O(log n)

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Message-ID: <20110721083454.GD3700@ubuntu>
Date:	Thu, 21 Jul 2011 09:34:55 +0100
From:	Joe Thornber <thornber@...hat.com>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	Zdenek Kabelac <zkabelac@...hat.com>,
	Milan Broz <mbroz@...hat.com>,
	"Alasdair G. Kergon" <agk@...hat.com>, dm-devel@...hat.com,
	gregkh@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCHES] improve sysfs performance, make it O(log n)

On Wed, Jul 20, 2011 at 06:56:50PM -0400, Mikulas Patocka wrote:
> Performance testing --- 10000 dm devices created with dmsetup:
> 
> The numbers are time in seconds to perform these operations:
> 1. create 10000 devices
> 2. ls -la /sys/block
> 3. ls -al /sys/block after a cache flush (echo 3 >/proc/sys/vm/drop_caches)
> 4. dmsetup remove_all
> 
> no patches	109	9.8	12	1624
> patch 1		109	9.1	12	15
> patches 1,2	120	0.19	3.0	16
> patches 1,2,3	68	0.17	0.47	12
> patches 1,2,3,4	68	0.15	0.48	11
> all patches	37	0.16	0.46	3.3

Fantastic improvement Mikulas!
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