reviving this thread: i am just running experiments on 10.1 beta3 and even setting dev.ix.*.fc=0 and flipping the interface up and down does not seem to help: if i read only from a subset of the queues, the entire rx unit stalls eventually.
I need to drain all queues to keep moving. Just tested this with 8 instances of netmap-ipfw running on an 8-core machine (8 queues enabled). netmap-ipfw netmap:ix0-0 netmap:ix1-0 netmap-ipfw netmap:ix0-1 netmap:ix1-1 ... and the source on another box is blasting on multiple queues with pkt-gen -f tx -i ix0 -d 10.0.10.0-10.0.10.255 I going to look at the driver's code now to see if/how this issue can be addressed. cheers luigi On Tue, Sep 23, 2014 at 6:00 PM, Adrian Chadd <adr...@freebsd.org> wrote: > Ah, this behaviour. > > It's called DROP_EN on the intel igb / ixgbe hardware. Grep the > drivers for that particular register bit/setting. > > Set that bit for an RX queue and it'll instruct the MAC to drop frames > destined if that RX ring is full to it and keep receiving on the other > rings. Otherwise yes, receiving on that ring with the ring full cuases > the MAC to stop receiving on all rings until that ring has free space. > > You flip this on with ixgbe and igb by disabling tx/rx flowcontrol > (sysctl dev.ix|igb.X.fc=0) before configuring the interface. > > > > -a > -- -----------------------------------------+------------------------------- Prof. Luigi RIZZO, ri...@iet.unipi.it . Dip. di Ing. dell'Informazione http://www.iet.unipi.it/~luigi/ . Universita` di Pisa TEL +39-050-2211611 . via Diotisalvi 2 Mobile +39-338-6809875 . 56122 PISA (Italy) -----------------------------------------+------------------------------- _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
