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Date: Sun, 17 May 2009 10:00:28 +0530
Message-ID: <93655eb70905162130k13ebd627o5eba2582508a1c07@mail.gmail.com>
Subject: Re: unresponsiveness on linux desktop during file copy
From: Satish Eerpini <eerpini@gmail.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Rik van Riel <riel@redhat.com>, Ray Lee <ray-lk@madrabbit.org>,
       Christoph Lameter <cl@linux-foundation.org>,
       linux-kernel <linux-kernel@vger.kernel.org>
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> I've prepared a rolled up patch for you, run time tested.  It should
> protect all of the above pages from being evicted by large file copies.
>
> The attached patch is for 2.6.29.

I applied the patch , but the number don seem to show much difference
, following are the statistics with the patched kernel, could
something else be causing the huge iowait,  :

Linux 2.6.29 (satish) 	05/17/2009

09:57:14 AM     CPU     %user     %nice   %system   %iowait    %steal     %idle
09:57:18 AM     all         12.93      0.00     10.25        33.44
 0.00     43.38
09:57:21 AM     all          13.32      0.00     28.09       24.40
 0.00     34.19
09:57:24 AM     all          10.79      0.00      4.76       75.56
 0.00      8.89
09:57:26 AM     all         11.46      0.00      8.01        35.64
 0.00     44.90
09:57:30 AM     all        11.68      0.00      8.88         35.05
 0.00     44.39
Average:           all         12.03      0.00     11.94      40.81
  0.00     35.22

and

hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   1332 MB in  2.00 seconds = 666.35 MB/sec
 Timing buffered disk reads:   24 MB in  3.32 seconds =   7.23 MB/sec

,

Cheers
Satish
-- 
http://satish.playdrupal.com