linux-kernel - Re: Performance of ext4

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Date:	Thu, 19 Jun 2008 00:58:44 -0600
From:	Andreas Dilger <adilger@....com>
To:	Holger Kiehl <Holger.Kiehl@....de>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Jan Kara <jack@...e.cz>, Theodore Tso <tytso@....edu>,
	Solofo.Ramangalahy@...l.net, Nick Dokos <nicholas.dokos@...com>,
	linux-ext4@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Performance of ext4

On Jun 18, 2008  05:58 +0000, Holger Kiehl wrote:
>      1.03       ------Sequential Output------ --Sequential Input- --Random-
>                 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> ext4               K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
>                16G 52133  98 221378 95 106873 32 55707  99 297065 42  1546   4
>                16G 52042  98 220931 93 107715 32 55939  98 298810 42  1543   3
>                16G 52975  98 220976 93 108060 31 56426  98 298906 42  1452   4
>
>ext4(patchqueue)16G 59727  98 252733 52 110177 25 55821  98 296739 42  1553   5
>>               16G 61047  99 239242 48 111664 25 55706  98 297151 42  1545   4
>>               16G 60503  99 241532 47 109655 25 55671  98 297648 42  1552   3
>
> I forgot to mention that for bonnie ext4-patch-queue reduces CPU-load
> a lot. For block writting it is nearly halved.

That was the main reason for developing mballoc.  With this patch it
would be able to drive almost 500MB/s write, 600MB/s read on the above
system instead of being CPU limited at 250/300MB/s.


Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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