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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