tomwaters wrote: > I have added the line to both servers and rebooted...but there does not > appear to have been any change to the transfer rate (max. ~45MB/s for large > files and down to 20-30MB/s for smaller). > > I compiled and installed iperf on both machines and am getting the following > rates...so something is not right. > > Both servers have decent disk write speeds (230MB/s for the nas and 120MB for > the backup server). > > [b]HELP...What do I look at next to debug this?[/b] > > n...@nas:~$ iperf -c 192.168.0.3 -f M -m > ------------------------------------------------------------ > Client connecting to 192.168.0.3, TCP port 5001 > TCP window size: 0.05 MByte (default) > ------------------------------------------------------------ > [ 3] local 192.168.0.1 port 40109 connected with 192.168.0.3 port 5001 > [ ID] Interval Transfer Bandwidth > [ 3] 0.0-10.0 sec 1116 MBytes 112 MBytes/sec > [ 3] MSS size 1460 bytes (MTU 1500 bytes, ethernet)
112MBytes/second is 896Mbits/second (8 bits per byte), or a rather substantial fraction of a gigabit per second. Remembering that this performance is measured using the application layer view, the actual overhead on the wire is about 3.8%, so the theoretical maximum is about 961.8Mbits/second (using a base-10 M). You're getting about 93% of the available bandwidth. How much faster do you think this link should be going? -- James Carlson 42.703N 71.076W <[email protected]> _______________________________________________ networking-discuss mailing list [email protected]
