On Sat, Feb 06, 2010 at 09:26:32PM -0600, Stan Hoeppner wrote: > Bostjan Skufca put forth on 2/6/2010 6:14 PM: > > Hello everybody! > > > > This is probably going to be a classic question but I cannot find a > > decent answer on net. > > > > I have samba server set up and the following things work flawlessly: > > - iperf shows 92% link utilization > > - FTP/SCP/HTTP transfers work in 10MB/s range. > > > > However, when I mount samba share with linux client (mount.cifs) the > > link utilization cannot bypass cca 33%. Transfer speeds constantly > > stops around 3.8MB/s and will not rise above it no matter what socket > > and locking options I use. > > > > Do you have any ideas about why this is happening and/or FAQ websites > > to point me to? > > I've had a similar thread running for a few weeks without resolution. In my > case I can max the wire (100FDX) at 92Mb/s to/from Win2K and WinXP clients > using > FTP, and smbclient from the server to shares on the workstations maxes the > wire > (at least GET from the workstations does). I'm running Samba 3.2.5 on Debian > Lenny with custom kernel 2.6.31.1. > > The max smb performance I can get in a single stream to/from smbd is 65Mb/s, > or > 8.5MB/s. I've now tested Win2K, WinXP, and smbclient on SLED 10 (can't recall > version). In all cases, no matter what performance settings I tweak in > smb.conf > or on the workstations, I can't get wire speed with a single SMB > stream---can't > get over 65Mb/s. > > Interestingly, two simultaneous SMB transfer streams (two Windows Explorer > file > copy operations on the same workstation) will max the wire at 92Mb/s, or > 11MB/s.
Hang on a minute, I haven't been paying attention to these emails as yet. Am I correct in saying: smbclient -> smbd maxes the wire. smbclient -> WinXP maxes the wire. But WinXP -> smbd gets 2/3 of the wire speed. And WinXP+WinXP (two streams) -> smbd maxes the wire. If this is the case, it's the 64k per read/write limit plus only one outstanding packet per stream issue with the WinXP redirector that's the issue. smbclient sends up to maxmux outstanding packets on read/write and keeps the pipeline full. That's why it can max the wire. The WinXP redirector is just not very good I'm afraid. Jeremy. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
