Has anyone out there run altq with cbq with bandwidth limits set around 40 ~ 50 Mb and seen it work well (actual through put allowed to come near that speed)?
Thanks --- Ricky Charlet Adara Networks USA 408-433-4942 > -----Original Message----- > From: [email protected] [mailto:owner-freebsd- > [email protected]] On Behalf Of Ricky Charlet > Sent: Wednesday, November 03, 2010 9:47 PM > To: '[email protected]'; '[email protected]' > Subject: Questioning altq (cbq) performance above 4Mb on gif or above > 40 Mb on e1000 > > Howdy, > > (FreeBsd 8.0REL plus a modified e1000 driver borrowing the 8.1 altq > capabilities, amd64, 8 core) > > I have been measuring altq performance on my system. I set a > cbq bandwith limit for a queue, match traffic to the queue with an > appropriate rule and pump data. > > Without altq enabled, my traffic gen tool (nuttcp) can pump > 800Mb across my gig links. > > With altq(cbq) setting bandwith limits (no borrow), up to about > 40Mb on em0 altq keeps up. But from 40Mb bandwith limit and up, altq > seems to slow down my traffic much slower than the bandwidth limits. > > Same effect is observed on gif interfaces (where my real > interest lies) but much worse. With altq(cbq) setting bandwith limits > (no borrow), up to about 4Mb on gif0 altq keeps up. But from 4Mb > bandwidth limit and up, altq seems to slow down my traffic much lower > than the bandwidth limits. > > I have a large file of sample data in excel formant which I'd > like to share. Is there an appropriate way to share it with this list? > > I know I'm not cpu bound (97% idle while nuttcp pushes 800Mb > traffic and altq configured with a bandwidth limit of 50Mb actually > passes 30Mb.) > > I sort of suspect I'm mutex bound but have no idea how to test > that. > > > > (1) this config allows about 4Mb tcp traffic to pass: > ----------cut------------------ > altq on em0 cbq bandwidth 100Mb queue { queue1, queue2 } > queue queue1 bandwidth 1Mb priority 7 cbq (default) > queue queue2 bandwidth 50Mb priority 1 cbq > pass out quick on gif10 inet proto tcp no state queue queue2 > pass out quick on gif10 proto icmp queue queue2 > ----------paste---------------- > > (2) this config allows about 40 Mb tcp traffic to pass > ----------cut------------------ > altq on em0 cbq bandwidth 100Mb queue { queue1, queue2 } > queue queue1 bandwidth 1Mb priority 7 cbq (default) > queue queue2 bandwidth 50Mb priority 1 cbq > pass out quick on em0 inet proto tcp no state queue queue2 > pass out quick on em0 proto icmp queue queue2 > ----------paste---------------- > > Yes, I send appropriate traffic in each case to be 'caught' by > the tcp pass out rule wether it be found on a gif or an em. > > > My goal is to get 'expected' behavior (a bandwidth limit of 40 > Mb allows 40Mb to pass) at T3 link speed (45Mb). Is this a reasonable > expectation? Any ideas about config jigs or tests to run? > > > > --- > Ricky Charlet > Adara Networks > USA 408-433-4942 > > > _______________________________________________ > [email protected] mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-pf > To unsubscribe, send any mail to "[email protected]" _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-pf To unsubscribe, send any mail to "[email protected]"
