On Tue, 2004-04-06 at 22:18, Neall wrote: > >> I'm wondering what's the maximum sustained transfer rate > >> that one can experience when using a 100Mbps link? > > 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. > > These numbers include NFS overhead (obviously): > > 100 Mb file: > 100/T: 11.335 MByte/Sec (averaged over many tests). > 1000/T: 69.9 MByte/Sec. > > Obviously, the 1000/T (gigabit) test would have immediately been > bottlenecked by the drive transfer rates. The 100/T rates are near > theoretical. Not sure where the 1000/T bottle neck is, but I used stock > NFS parameters. I may try to transfer via socket or rpc, but just haven't > gotten there yet. I figured most people transfer via NFS (or SAMBA) > mounted drives, so wanted to start there. > > Still, ~70 MByte/sec isn't shabby over gigabit ethenet via NFS. Neall > > Hi have you considered putting the data file in a ram disk to overcome the disk transfer overhead? assuming you have enough physical memory so you don't hit swapping! Laurence
