> On 22 Jun 2016, at 04:08, Jason Zhang <jasonzh...@cyphytech.com> wrote: > > Mark, > > Thanks > > We have same RAID setting both on FreeBSD and CentOS including cache setting. > In FreeBSD, I enabled the write cache but the performance is the same. > > We don’t use ZFS or UFS, and test the performance on the RAW GEOM disk > “mfidx” exported by mfi driver. We observed the “gstat” result and found > that the write latency > is too high. When we “dd" the disk with 8k, it is lower than 1ms, but it is > 6ms on 64kb write. It seems that each single write operation is very slow. > But I don’t know > whether it is a driver problem or not.
There is an option you can use (I do it all the time!) to make the card behave as a plain HBA so that the disks are handled by the “da” driver. Add this to /boot/loader.conf hw.mfi.allow_cam_disk_passthrough=1 mfip_load=“YES" And do the tests accessing the disks as “da”. To avoid confusions, it’s better to make sure the disks are not part of a “jbod” or logical volume configuration. Borja. _______________________________________________ freebsd-performance@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscr...@freebsd.org"
