Strange behaviour of UFS2+SU FS on FreeBSD 8-Stable: dreadful
perofrmance for old data, excellent for new.
Ivan Voras
ivoras at freebsd.org
Sat Aug 27 17:03:11 UTC 2011
On 27.8.2011. 9:21, Lev Serebryakov wrote:
> I'm going to investigate alter, why it is ony ~180MiB/s, when
> theoretically it should be about (90*4) 360MiB/s linear read, and whom
> to blame: UFS or geom_raid5 or both :)
Try this: http://ivoras.net/blog/tree/2010-11-19.ufs-read-ahead.html
(or it could be a hardware issue - controller bottleneck or something
like that).
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