On Tue, Nov 29, 2011 at 10:36:44AM -0500, John Baldwin wrote: > On Monday, November 28, 2011 7:12:39 pm Daryl Sayers wrote: > > >>>>> "Bengt" == Bengt Ahlgren <ben...@sics.se> writes: > > > > > Daryl Sayers <da...@ci.com.au> writes: > > >> Can anyone suggest why I am getting poor write performance from my nfs > > >> setup. > > >> I have 2 x FreeBSD 8.2-STABLE i386 machines with ASUS P5B-plus mother > > >> boards, > > >> 4G mem and Dual core 3g processor using 147G 15k Seagate SAS drives with > > >> onboard Gb network cards connected to an idle network. The results below > > >> show > > >> that I get nearly 100Mb/s with a dd over rsh but only 15Mbs using nfs. It > > >> improves if I use async but a smbfs mount still beats it. I am using the > > >> same > > >> file, source and destinations for all tests. I have tried alternate > > >> Network > > >> cards with no resulting benefit. > > > > > [...] > > > > >> Looking at a systat -v on the destination I see that the nfs test does > > >> not > > >> exceed 16KB/t with 100% busy where the other tests reach up to 128KB/t. > > >> For the record I get reads of 22Mb/s without and 77Mb/s with async > > >> turned on > > >> for the nfs mount. > > > > > On an UFS filesystem you get NFS writes with the same size as the > > > filesystem blocksize. So an easy way to improve performance is to > > > create a filesystem with larger blocks. I accidentally found this out > > > when I had two NFS exported filesystems from the same box with 16K and > > > 64K blocksizes respectively. > > > > > (Larger blocksize also tremendously improves the performance of UFS > > > snapshots!) > > > > Thanks to all that answered. I did try the 'sysctl -w vfs.nfsrv.async=1' > > with > > no reportable change in performance. We are using a UFS2 filesystem so the > > zfs command was not required. I did not try the patch as we would like to > > stay > > as standard as possible but will upgrade if the patch is released in new > > kernel. > > If you can test the patch then it is something I will likely put into the > next release. I have already tested it as far as robustness locally, what > I don't have are good performance tests. It would really be helpful if you > were able to test it.
John, We'd like to test this patch[1], but need to know if it needs to be applied to just the system acting as the NFS server, or the NFS clients as well. [1]: http://www.freebsd.org/~jhb/patches/nfs_server_cluster.patch -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, US | | Making life hard for others since 1977. PGP 4BD6C0CB | _______________________________________________ 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"
