On Thu, Aug 28, 2008 at 12:53:00PM -0700, Mike Myers wrote: > Hi everyone. I am running Samba 3.2.0-22.1 (as packaged by OpenSUSE in > 11.0) on a storage server connected to multiple windows based clients > over a gigabit ethernet link. The server is a quad core Intel CPU and > is equipped with an Intel e1000 based gigabit ethernet controller and plugged > into a common gigabit ethernet switch with the windows clients. > > I am seeing performance issues on transfers over the gigabit ethernet network, > and was trying to play with the socket options settings in the smb.conf > file to improve transfers rates, but no matter what I set the SO_RCVBUF > and SO_SNDBUF values too, the transfer rates are unchanged, even if I > set the buffer sizes down to 512, which should have the effect of at > least slowing things down dramatically, leading me to question if Samba > is actually using these settings at all. TCP_NODELAY is set, but it > doesn't seem to matter much if I include it or not on the socket > options line, and the line is definitely not commented out, as if I > misspell something on that line, samba terminates with an error when I > try and restart the daemon.
Samba is definately setting these options. > Samba is getting roughly 30 MB/s tranfer rates from the linux server to a > windows vista and a windows XP client, > and the disks on both windows machines are RAID0 (4 and 2 disk RAID0 > sets respectively), so I don't think I am running into filesystem > performance issues on the target. Moving from the windows systems to Samba, > I see about 45 MB/sec transfers rates. > > The > raid array on the samba server consist of 2 6 disk raid5 sets with fast > disks on them, running lvm and XFS for a filesysteem. I can do a dd of > a multigigabyte file to /dev/null and get roughly 500-600 MB/'s > transfer rates through the filesystem, so I don't think the raid array > and file system is a bottleneck. > > I have run netperf tests > between the server and the clients to see if I had some network > plumbing problems. With default socket settings for netperf (8182 > buffer size), I get about 300 mbps transfer rates between the clients > and the server (which matches approximately the 30 MB/s transfer > rates). With 65536 byte buffers, that number goes to 970 or so Mbps, > so I think the interface cards, TCP stack, switches are all ok. Can you try using smbclient to do a large file transfer from another client Linux box and time that please ? That eliminates the Windows clients from the equation, and allows us to test only with things we can examine directly. Jeremy. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/listinfo/samba
