Hi All, I have a question which I am not able to answer myself.I request you all to give me some input. When I measure the performance of iSCSI on XScale with MTU size = 1500 bytes, a throughput of 32 Mbps was observed. As the MTU size was increased, the throughput also increased. 1500 -> 32 Mbps 3000 -> 56 4500 -> 80 6000 -> 100 7500 -> 108 9000 -> 108 Actually the throughput saturates. I thought, the per-packet overhead decreases as the MTU size increases. This contributes to the performance improvement. And the saturation is achieved because, the iSCSI max PDU size is 8k. Even if we increase the MTU size beyond 8k, we will not see any change because, iSCSI devivers a max of 8K PDU to TCP. Therefore a saturation in throughput is observed. But the question is, Am I thinking correctly? secondly, if yes,does the per-packet over head decrease the performance so much. we are observing, somewhere like 4 times improvement in throughput. Can there be any other reason for this observation. Thanking you Shesha -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
