Jesse, I was able to push 130 kpps max and the cpu usage was less than 1%. iperf was not doing so great in its multithreaded mode, so I had to start separate instances. No I did not try just updating usage. Let me see if I can push the packets per second higher than this so the test could be more realistic.
Thanks. On Wed, May 28, 2014 at 5:27 PM, Jesse Gross <je...@nicira.com> wrote: > On Mon, May 26, 2014 at 5:03 PM, Madhu Challa <cha...@noironetworks.com> > wrote: > > Jesse, > > > > I ran an iperf test (4 client server pairs) with and without the stats > and > > there was no noticeable difference in the measured bandwidth. However as > I > > increase the number of connections from 1 to 4 I do see the spin lock > > overhead for this call stack (as a percent of total spin lock overhead on > > the system) go up from 6% to 16%. I have 2 numa nodes on my system and 32 > > cores. But yes it is not affecting bandwidth. > > Do you notice a difference in the total CPU usage with stats on vs. > off? The significance of the relatively percentage depends on how big > the total spinlock overhead is, presumably. > > Also, did you try it with updating last used but not packets/bytes? > > Overall, I'm not too excited about going down this path unless there > is a really strong performance justification. The potential to be a > pain in the future seems high... >
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