N5K/N2K are line rate, you needn't to play with fex buffers TCP Window size use 16 bits: that explain your exact 2^32-1= 65535 max window size
Iperf: use UDP instead of TCP if you need to avoid any window size wrong issue On Sat, Jun 18, 2011 at 3:35 PM, Arne Larsen / Region Nordjylland < [email protected]> wrote: > Hi all > > Has anyone use iperf for testing performance trough Nexus 5000 and 2000. > I'm trying to find a problem with EMC nfs-share on 10Gb interace towards > 1Gb interface. > If I user iperf as a client on the 10G link and as a server on the 1G link, > and the only way I can max the link out, is with a window size of 64K. > I normally don't have any problems using iperf, and if I do the same test > on a storeNforward environment. > I just want to be sure that the result I see is correct. > And if this is correct, why exact 64K ??. I have tried to tune the buffers > on the fex, but without any luck. > > > /Arne > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
