Messages in this thread | | | Date | Tue, 13 Feb 2007 13:54:25 -0600 | From | Jeffrey Hundstad <> | Subject | Re: SATA-performance: Linux vs. FreeBSD |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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