[c-nsp] Preformance proiblems with Nexus5K and 2K 10G to 1G

[Arne Larsen / Region Nordjylland]

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