> > If you are meaning in term of Packet per second, you are right. > > These are the packet per second measured during tests: > > > > 64 byte: 610119 Pps > > 512 byte: 516917 Pps > > 1492 byte: 464962 Pps > > > > > >> Am I correct that the maximum you can reach is around 639,000 packets > >> per second? > > > > Yes, as you can see the maximum is 610119 Pps. > > Where does this limit come from? > > I duno - the tests I did before were with SYN packets (random source) > which was my worst scenario, > and the server CPU were busy generating MD5 check sums for > "syncache" (around 35% of the time). > > If I have to compare my results with your, you beat me with factor > 2.5, may be because you use ICMP for the test > and your processor is better then my test stations :) > Also my experience is only with gigabit cards (em driver) and FreeBSD > 7.something_before_1 where the em thread was eating 100% cpu. > If you are lucky LOCK_PROFILING(9) will help you to see where the CPUs > spend their time, if not you will see kernel panic :)
I will check, thanks for the hint. > Once problematic locks identified they can be reworked, but I think > the first part is already done > and work on the second already started. > > In my experience increasing hw.em.rxd and hw.em.txd yelled better > results, but I think ixgb already comes tuned by default > as it still doesn't have to support such a large number of different > cards. I did some tuning in the code of the driver e recompiled the kernel in order to reduce context switching (interrupt mitigation) since the driver does not support POLLING. > Also at the time of my tests there were not support for multi queues > in the OS even if they were supported by the HW, which is changed in > 7.2 (?) It looks like multi queue is working since I can see the load distributed over the 4 cores. Fabrizio Questo messaggio e i suoi allegati sono indirizzati esclusivamente alle persone indicate. La diffusione, copia o qualsiasi altra azione derivante dalla conoscenza di queste informazioni sono rigorosamente vietate. Qualora abbiate ricevuto questo documento per errore siete cortesemente pregati di darne immediata comunicazione al mittente e di provvedere alla sua distruzione, Grazie. This e-mail and any attachments is confidential and may contain privileged information intended for the addressee(s) only. Dissemination, copying, printing or use by anybody else is unauthorised. If you are not the intended recipient, please delete this message and any attachments and advise the sender by return e-mail, Thanks. _______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscr...@freebsd.org"
