On Saturday 05 June 2010 00:58:35 Adam PAPAI wrote: > Why FreeBSD is supreme with 1 and 2 thread. And why is it 2 and 3 times > slower with 4-8-16-32 threads compared to Debian? The first two tests (1 > thread and 2 thread) showed me that FreeBSD is supreme in I/O, but later > tests showed me, that it can produce horrible I/O. > > How can I tune my disk to make it faster? Is it possible? What is the > reason of the really slow I/O with more than 4 threads? What do you > recommend me to do? Why is it damn slow with 8K blocksize?
Some quick tests show that ufs does do rather poorly on my system too. I have the following filesystems setup: /var : ufs with softupdates /usr/obj : zfs with checksums disabled /usr/src : zfs with compression enabled /home : zfs with compression disabled and checksums enabled I ran a test with a blocksize of 8KB and 16 threads. /var : 25.2MB/s /usr/obj : 64.8MB/s /usr/src : 386.3MB/s /home : 60.3MB/s -- Bruce Cran _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
