linux-kernel - Re: Abysmal disk performance, how to debug?

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Date:	Sat, 20 Jan 2007 14:56:20 -0500
From:	Stephen Clark <Stephen.Clark@...lark.us>
To:	Sunil Naidu <akula2.shark@...il.com>
CC:	Willy Tarreau <w@....eu>,
	Ismail Dönmez <ismail@...dus.org.tr>,
	linux-kernel@...r.kernel.org
Subject: Re: Abysmal disk performance, how to debug?

Sunil Naidu wrote:

>On 1/20/07, Willy Tarreau <w@....eu> wrote:
>  
>
>>It is not expected to increase write performance, but it should help
>>you do something else during that time, or also give more responsiveness
>>to Ctrl-C. It is possible that you have fast and slow RAM, or that your
>>video card uses shared memory which slows down some parts of memory
>>which are not used anymore with those parameters.
>>    
>>
>
>I did test some SATA drives, am getting these value for 2.6.20-rc5:-
>
>[sukhoi@...hoon ~]$ time dd if=/dev/zero of=/tmp/1GB bs=1M count=1024
>1024+0 records in
>1024+0 records out
>1073741824 bytes (1.1 GB) copied, 21.0962 seconds, 50.9 MB/s
>
>What can you suggest here w.r.t my RAM & disk?
>
>  
>
>>Willy
>>    
>>
>
>Thanks,
>
>~Akula2
>-
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>
>  
>
Hi,
whitebook vbi s96f core 2 duo t5600 2gb hitachi ATA      HTS721060G9AT00 
using libata
 time dd if=/dev/zero of=/tmp/1GB bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 10.0092 seconds, 107 MB/s

real    0m10.196s
user    0m0.004s
sys     0m3.440s


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