TCP throughput is much worse on SUSE than RHEL 6.2

DarioGi · 06-03-2013, 12:43 PM

I'm testing IPoIB performance on 2 Virtual Machines, which have same # of processors and amount of memory assigned to them. While running NETPerf TCP_STREAM test I've noticed that SUSE 12 SP2&3 has much lower TCP_STREAM performance, in fact much worse, from 9Gbit/s on RHEL 6.2, while only getting 2.5 Gbit/s on SUSE SP2/SP3. I've tried playing around with fine tuning TCP performance in general, processor affinity and w/r memory settings. What such great difference in TCP handling could there be between two of the distro's?

unSpawn · 06-03-2013, 01:10 PM

I'd start by reverting all tweaks, ensure both are in runlevel 3, no unnecessary services running and at a minimum compare VM guest kernel version, ethernet device driver, loaded modules and configuration, scheduler, net-related sysctls and configuration, routing, firewall.