linux-kernel - Re: SATA-performance: Linux vs. FreeBSD

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Date:	Tue, 13 Feb 2007 13:54:25 -0600
From:	Jeffrey Hundstad <jeffrey.hundstad@...u.edu>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	"Martin A. Fink" <fink@....mpg.de>,
	Matthias Schniedermeyer <ms@...d.de>,
	linux-kernel@...r.kernel.org
Subject: Re: SATA-performance: Linux vs. FreeBSD

Arjan van de Ven wrote:
>> The problem is: FreeBSD is fast, but lacks of some special drivers. Linux has 
>> all drivers but access to harddisk is unpredictable and thus unreliable!
>> What can I do??
>>     
>
>
> there's several tunables you can do;
> 1) increase /sys/block/<device>/queue/nr_requests
>    the linux default is on the low side
> 2) investigate other elevators; cfq is great for interactive use but not
> so great for max throughput. you can do this by echo'ing "deadline"
> into /sys/block/<device>/scheduler
>   

I'd suggest trying the noop scheduler with your ram based devices.  I 
don't see why these devices would need clever scheduling.  ...but prove 
me wrong if you will.  I haven't tested this.

echo noop > /sys/block/<device>/queue/scheduler

If you don't need journaling EXT2 might be a good choice.  But, I'd also 
like to re-iterate the XFS filesystem recommendation given several times 
now as well.  There are many tunables that /may/ help during filesystem 
creation.  Block size (-b) set to it's maximum would prob. help.

If you're sure you can not encounter power issues:
mount -t xfs -o nobarrier /dev/<device> /mount-point

Here's some more general reading for ya:
Troubleshooting Linux Performance Issues:
http://www.phptr.com/articles/article.asp?p=481867&seqNum=2&rl=1

-- 
Jeffrey Hundstad
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