100Mbps Ethernet Speed/Efficiency

[dalen]

Neall wrote:
> I took the hard drives out of the picture.  I set up RAM disks on two
> different systems, and connected them via ethernet using NFS to cross
> mount them.  Then, I copied from the first system's RAM disk over
> ethernet, to the second system's RAM disk.  Granted, NFS is in the
> picture, but it would be using hard drives, too.

> 1000/T: 69.9 MByte/Sec.

I am getting about the same with Intel Gb nics via ttcp.

[root at ecae4 root]# ttcp -t -s -f M -n 100000 -p 80 ecae5
ttcp-t: buflen=8192, nbuf=100000, align=16384/0, port=80  tcp  -> ecae5
ttcp-t: socket
ttcp-t: connect
ttcp-t: 819200000 bytes in 11.85 real seconds = 65.93 MB/sec +++
ttcp-t: 100000 I/O calls, msec/call = 0.12, calls/sec = 8439.24
ttcp-t: 0.0user 10.4sys 0:11real 88% 0i+0d 0maxrss 0+2pf 0+0csw