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From: "David B. Stevens" <dsteven3@maine.rr.com>
To: Thomas Molina <tmolina@cablespeed.com>
Cc: Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.0 performance problems
Date: Mon, 29 Dec 2003 18:25:36 -0500	[thread overview]
Message-ID: <3FF0B7F0.2020403@maine.rr.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0312291755080.5835@localhost.localdomain>

Thomas,

Have you tried lowering the read ahead in 2.6 to 8.

I don't know what you are doing with your workload but it is possible 
that you are transferring useless data and clogging the plumbing a bit.

Cheers,
  Dave



Thomas Molina wrote:

>It certainly looks like DMA is enabled.  Under 2.4 I get:
>
>[root@lap root]# hdparm /dev/hda
>
>/dev/hda:
> multcount    = 16 (on)
> IO_support   =  1 (32-bit)
> unmaskirq    =  1 (on)
> using_dma    =  1 (on)
> keepsettings =  0 (off)
> readonly     =  0 (off)
> readahead    =  8 (on)
> geometry     = 2584/240/63, sectors = 39070080, start = 0
>
>
>Under 2.6  I get:
>
>[root@lap root]# hdparm /dev/hda
>
>/dev/hda:
> multcount    = 16 (on)
> IO_support   =  1 (32-bit)
> unmaskirq    =  1 (on)
> using_dma    =  1 (on)
> keepsettings =  0 (off)
> readonly     =  0 (off)
> readahead    = 256 (on)
> geometry     = 38760/16/63, sectors = 39070080, start = 0
>  
>



  parent reply	other threads:[~2003-12-29 23:24 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-12-29 22:07 2.6.0 performance problems Thomas Molina
2003-12-29 22:21 ` Linus Torvalds
2003-12-29 22:58   ` Thomas Molina
2003-12-29 23:04     ` Linus Torvalds
2003-12-30 14:14       ` Thomas Molina
2003-12-30 14:39         ` William Lee Irwin III
2003-12-30 21:14           ` Thomas Molina
2003-12-30 21:23             ` Linus Torvalds
2003-12-31  0:50               ` Thomas Molina
2003-12-31  1:01                 ` Linus Torvalds
2003-12-31  1:34                 ` Andrew Morton
2003-12-31 11:25                   ` bert hubert
2003-12-30 21:35             ` William Lee Irwin III
2003-12-30 23:46             ` Roger Luethi
2003-12-30 18:20         ` Linus Torvalds
2003-12-29 23:14     ` Martin Schlemmer
2003-12-30  5:09       ` William Lee Irwin III
2003-12-30 10:27         ` Thomas Molina
2003-12-29 23:25     ` David B. Stevens [this message]
2003-12-29 23:05   ` Thomas Molina
2003-12-29 23:43     ` Martin Schlemmer
2003-12-30  0:17       ` Thomas Molina
2003-12-30  1:23         ` Martin Schlemmer
2003-12-30  1:27         ` Dave Jones
2003-12-30  1:37           ` Martin Schlemmer
2003-12-30  1:40             ` Dave Jones
2003-12-30  1:49             ` Thomas Molina
2003-12-30  2:03               ` Mike Fedyk
2004-01-03 19:37     ` Bill Davidsen
2003-12-30  1:25 ` Roger Luethi
2003-12-30  1:37   ` Thomas Molina
2003-12-30 19:21     ` Andy Isaacson
2003-12-30 19:40       ` William Lee Irwin III
2003-12-30 22:24         ` Roger Luethi
2003-12-31  0:33           ` Thomas Molina
2003-12-31 10:17             ` Roger Luethi
2003-12-31 11:21               ` Jens Axboe
2003-12-31 21:03                 ` Roger Luethi
2004-01-01  1:27                   ` Thomas Molina
2004-01-01 10:23                     ` Roger Luethi
2004-01-01 23:09                 ` Roger Luethi
2004-01-02 10:11                   ` Jens Axboe
2003-12-30  1:27 ` Thomas Molina
2003-12-30  2:53   ` Thomas Molina
2003-12-30 11:41 Samium Gromoff
2004-01-03 19:54 ` Bill Davidsen
     [not found] ` <200312300855.00741.edt@aei.ca>
2004-01-05 12:33   ` Samium Gromoff
2004-01-05 15:09     ` Ed Tomlinson
2004-01-06  2:23       ` David Lang
2004-01-06 14:44         ` Samium Gromoff

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