On Fri, 8 Jan 2016, Adrian Chadd wrote:
On 7 January 2016 at 23:58, Mark Delany <c...@romeo.emu.st> wrote:
On 08Jan16, Bruce Evans allegedly wrote:
If the NIC can't reach line rate
Network stack overheads are also enormous.
Bruce makes some excellent points.
I challenge anyone to get line rate UDP out of FBSD (or Linux) for a
1G NIC yet alone a 10G NIC listening to a single port. It was exactly
my frustration with UDP performance that led me down the path of
*mmsg() and netmap.
Frankly this is an opportunity for FBSD as UDP performance appears to
be a neglected area.
I'm there, on 16 threads.
I'd rather we do it on two or three, as a lot of time is wasted in
producer/consumer locking. but yeah, 500k tx/rx should be doable per
CPU with only locking changes.
Line rate for 1 Gbps is about 1500 kpps (small packets).
With I218V2 (em), I see enormous lock contention above 3 or 4 (user)
threads, and 8 are slightly slower than 1. 1 doesn't saturate the NIC,
and 2 is optimal.
Bruce
_______________________________________________
freebsd-net@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-net
To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
