I'm running a build of the mps(4) driver on FreeBSD 8.2 with an LSI SAS2008 bus adapter. The code I'm using was current as of the last commit on 2011-02-25, and is built for amd64.
I can't seem to get any better performance than about 250MB/s writes through the controller. I'm testing with a zpool of six 250MB magnetic SATA disks, doing a couple of concurrent sequential writes with dd: dd bs=128k if=/dev/zero of=/datadisk/zero1 & dd bs=128k if=/dev/zero of=/datadisk/zero2 & This is in comparison to an older LSI C1068E controller using the mpt driver with an identical 6-disk zpool. Such a configuration can easily sustain 500MB/s writes. A devlist from camcontrol reports: scbus0 on mps0 bus 0: <ATA ST9250410AS SDM1> at scbus0 target 0 lun 0 (pass0,da0) <ATA ST9250410AS SDM1> at scbus0 target 1 lun 0 (pass1,da1) <ATA ST9250410AS SDM1> at scbus0 target 2 lun 0 (pass2,da2) <ATA ST9250410AS SDM1> at scbus0 target 3 lun 0 (pass3,da3) <ATA ST9250410AS SDM1> at scbus0 target 4 lun 0 (pass4,da4) <ATA ST9250410AS SDM1> at scbus0 target 5 lun 0 (pass5,da5) <ATA ST9250410AS SDM1> at scbus0 target 6 lun 0 (pass6,da6) <ATA ST9250410AS SDM1> at scbus0 target 7 lun 0 (pass7,da7) scbus-1 on xpt0 bus 0: <> at scbus-1 target -1 lun -1 (xpt0) I realize that this driver is fairly new; if there is any information that would be helpful in finding the bottleneck, I would be happy to provide it. Thanks! - .Dustin_______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"