On 31 January 2013 14:38, Philipp Kern <[email protected]> wrote: > Also you should be able to do between 100MB/s to 1GB/s on 10 GE, which is
My rule of thumb is that pumping 100 MB/s or so through the Linux TCP/IP stack will burn a CPU, maybe half if he can use large packets. So 1 GB/s takes 5-10 CPUs if the wire can stand it. I have not measured the z/OS stack, but considering that he's probably using capacity model CPUs for z/OS, that might be the choke in the path. And it would not be the first case for network benchmarks being limited by Linux disk I/O speed... Since he mentioned FTP, encryption will not be the problem. Still, with decent gear the suggested 6 MB/s for FTP is still low... I did once work on a problem where FTP bandwidth was highly asymmetric (get from Linux was 3 orders of magnitude faster than put from z/OS). If such a big difference is observed in this case, I might be able to help tune the buffers (which is harder than just making them bigger). Rob van der Heij Velocity Software http://www.velocitysoftware.com/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
