On Tue, Dec 06, 2011 at 07:40:21PM +0200, Daniel Kalchev wrote: > I see significant difference between number of interrupts on the Intel and > the AMD blades. When performing a test between the Intel and AMD blades, the > Intel blade generates 20,000-35,000 interrupts, while the AMD blade generates > under 1,000 interrupts. >
Even in my experiments there is a lot of instability in the results. I don't know exactly where the problem is, but the high number of read syscalls, and the huge impact of setting interrupt_rate=0 (defaults at 16us on the ixgbe) makes me think that there is something that needs investigation in the protocol stack. Of course we don't want to optimize specifically for the one-flow-at-10G case, but devising something that makes the system less affected by short timing variations, and can pass upstream interrupt mitigation delays would help. I don't have a solution yet.. cheers luigi _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
