On Mon, Jan 12, 2015 at 12:51 PM, Balasubramaniam Natarajan <bala150...@gmail.com> wrote: > > I have two system A and B connected with a LAN cable. Both of them were > made in the last one year so it does not matter if it is straight through > or cross over. > > When I tried to issue a ethtool eth0 I see that both machine are capable of > supporting 1000baseT/Full. However when I try to transfer file across them > it is capable of doing it only at 4MegaBytes per second max. I expected to > see at least over a 100 MegaBytes per second. Where am I going wrong ? >
The theoretical speed would be 1000Mbps/8 to get a 125 MBytes/sec number. However, when both are connected to a switch or a hub, sharing the ethernet fabric with other nodes, then there is a lot of collision between nodes when they broadcast ethernet frames. With a good switch like a HP Pro Curve, the max I have got is around 45 MB/s for 1 Gb/s NICs. You have not mentioned if A and B are connected to each directly i.e. not through a switch/hub. Try connecting the 2 systems directly with a high quality short cable and see what's the max throughput you get. -- Arun Khan _______________________________________________ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc ILUGC Mailing List Guidelines: http://ilugc.in/mailinglist-guidelines
