From: Joe Thornber <thornber@redhat.com>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Zdenek Kabelac <zkabelac@redhat.com>,
Milan Broz <mbroz@redhat.com>,
"Alasdair G. Kergon" <agk@redhat.com>,
dm-devel@redhat.com, gregkh@suse.de,
linux-kernel@vger.kernel.org
Subject: Re: [PATCHES] improve sysfs performance, make it O(log n)
Date: Thu, 21 Jul 2011 09:34:55 +0100 [thread overview]
Message-ID: <20110721083454.GD3700@ubuntu> (raw)
In-Reply-To: <Pine.LNX.4.64.1107201836310.4812@hs20-bc2-1.build.redhat.com>
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!
next prev parent reply other threads:[~2011-07-21 8:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-20 22:56 [PATCHES] improve sysfs performance, make it O(log n) Mikulas Patocka
2011-07-21 8:34 ` Joe Thornber [this message]
2011-07-21 16:31 ` Greg KH
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