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From: Stan Hoeppner <stan@hardwarefreak.com>
To: xfs@oss.sgi.com
Subject: Re: XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?)
Date: Sat, 14 Apr 2012 02:32:24 -0500	[thread overview]
Message-ID: <4F892808.2040003@hardwarefreak.com> (raw)
In-Reply-To: <CAAxjCEw-WZ9AtEJTZ6eS9+mjm+yh=e_19aJqxUN-ABRp8r3ZyQ@mail.gmail.com>

On 4/13/2012 2:36 PM, Stefan Ring wrote:
>> Let's rerun it with files cached (the machine has 16 GB RAM, so
>> every single file must be cached):
>>
>> # time tar xf test.tar
>>
>> real    0m50.842s
>> user    0m0.809s
>> sys     0m13.767s
> 
> That’s about the same time I’m getting on a fresh (non-fragmented)
> file system with the RAID 6 volume.
> 
> Interestingly, the P400’s successor, the P410 does recognize a setting
> that the P400 lacks, which is called elevatorsort. It sounds like this
> could make all the difference. Unfortunately, the P400 doesn’t have
> it. I don’t have a P410 with more than 2 drives to test this, but some
> effect should definitely be measurable.
> 
> Since this finding has piqued my interest again, I’m willing to invest
> a little more time, but I’m completely occupied for the next few days,
> so it will have to wait a while.

What configuration are you running right now Stefan?  You said you went
back to XFS due to the EXT4 lockups, but I can't recall what RAID config
you put underneath it this time.

-- 
Stan

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  reply	other threads:[~2012-04-14  7:32 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-05 18:10 XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?) Stefan Ring
2012-04-05 19:56 ` Peter Grandi
2012-04-05 22:41   ` Peter Grandi
2012-04-06 14:36   ` Peter Grandi
2012-04-06 15:37     ` Stefan Ring
2012-04-07 13:33       ` Peter Grandi
2012-04-05 21:37 ` Christoph Hellwig
2012-04-06  1:09   ` Peter Grandi
2012-04-06  8:25   ` Stefan Ring
2012-04-07 18:57     ` Martin Steigerwald
2012-04-10 14:02       ` Stefan Ring
2012-04-10 14:32         ` Joe Landman
2012-04-10 15:56           ` Stefan Ring
2012-04-10 18:13         ` Martin Steigerwald
2012-04-10 20:44         ` Stan Hoeppner
2012-04-10 21:00           ` Stefan Ring
2012-04-05 22:32 ` Roger Willcocks
2012-04-06  7:11   ` Stefan Ring
2012-04-06  8:24     ` Stefan Ring
2012-04-05 23:07 ` Peter Grandi
2012-04-06  0:13   ` Peter Grandi
2012-04-06  7:27     ` Stefan Ring
2012-04-06 23:28       ` Stan Hoeppner
2012-04-07  7:27         ` Stefan Ring
2012-04-07  8:53           ` Emmanuel Florac
2012-04-07 14:57           ` Stan Hoeppner
2012-04-09 11:02             ` Stefan Ring
2012-04-09 12:48               ` Emmanuel Florac
2012-04-09 12:53                 ` Stefan Ring
2012-04-09 13:03                   ` Emmanuel Florac
2012-04-09 23:38               ` Stan Hoeppner
2012-04-10  6:11                 ` Stefan Ring
2012-04-10 20:29                   ` Stan Hoeppner
2012-04-10 20:43                     ` Stefan Ring
2012-04-10 21:29                       ` Stan Hoeppner
2012-04-09  0:19           ` Dave Chinner
2012-04-09 11:39             ` Emmanuel Florac
2012-04-09 21:47               ` Dave Chinner
2012-04-07  8:49         ` Emmanuel Florac
2012-04-08 20:33           ` Stan Hoeppner
2012-04-08 21:45             ` Emmanuel Florac
2012-04-09  5:27               ` Stan Hoeppner
2012-04-09 12:45                 ` Emmanuel Florac
2012-04-13 19:36                   ` Stefan Ring
2012-04-14  7:32                     ` Stan Hoeppner [this message]
2012-04-14 11:30                       ` Stefan Ring
2012-04-09 14:21         ` Geoffrey Wehrman
2012-04-10 19:30           ` Stan Hoeppner
2012-04-11 22:19             ` Geoffrey Wehrman
2012-04-07 16:50       ` Peter Grandi
2012-04-07 17:10         ` Joe Landman
2012-04-08 21:42           ` Stan Hoeppner
2012-04-09  5:13             ` Stan Hoeppner
2012-04-09 11:52               ` Stefan Ring
2012-04-10  7:34                 ` Stan Hoeppner
2012-04-10 13:59                   ` Stefan Ring
2012-04-09  9:23             ` Stefan Ring
2012-04-09 23:06               ` Stan Hoeppner
2012-04-06  0:53   ` Peter Grandi
2012-04-06  7:32     ` Stefan Ring
2012-04-06  5:53   ` Stefan Ring
2012-04-06 15:35     ` Peter Grandi
2012-04-10 14:05       ` Stefan Ring
2012-04-07 19:11     ` Peter Grandi

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