Date: Tue, 19 Apr 2005 23:10:49 +0200 From: Eivind Hestnes <eivind@stabbursmoen.no> To: Michael DeMan <michael@staff.openaccess.org> Cc: performance@freebsd.org Subject: Re: Performance Intel Pro 1000 MT (PWLA8490MT) Message-ID: <426573D9.8080607@stabbursmoen.no> In-Reply-To: <d00578af6eff12d7aa5139bbb410a1d2@staff.openaccess.org> References: <20050419183335.F18008131@joshua.stabbursmoen.no> <5c05f1805041911351d2bd98e@mail.gmail.com> <42656CA0.9040403@stabbursmoen.no> <d00578af6eff12d7aa5139bbb410a1d2@staff.openaccess.org>
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It sounds sensible, but I have also learned that throwing hardware on a problem is not always right.. Compared to shiny boxes from Cisco, HP etc. a 500 Mhz router is for heavy duty networks. I would try some more tweaking before replacing the box with some more spectular hardware. - E. Michael DeMan wrote: > The rule of thumb I have seen on Intel/UNIX based routers is that you > want 1GHz of CPU for every gigabit of throughput. > > Also, on gigabit NICs, make sure you have a 64-bit PCI bus on the > motherboard. > > > > Michael F. DeMan > Director of Technology > OpenAccess Network Services > Bellingham, WA 98225 > michael@staff.openaccess.org > 360-647-0785 > On Apr 19, 2005, at 1:40 PM, Eivind Hestnes wrote: > >> Thanks for the advice. Didn't do any difference, though.. Perhaps I >> should try to increase the polling frequency.. >> >> Jerald Von Dipple wrote: >> >>> Hey man >>> >>> You need to bump >>> >>> kern.polling.burst: 150 >>> >>> Upto at least 150000 >>> >>> Regards, >>> Jerald Von D. >>> >>> On 4/19/05, Eivind Hestnes <eivind@stabbursmoen.no> wrote: >>> >>>> Hi, >>>> >>>> I have an Intel Pro 1000 MT (PWLA8490MT) NIC (em(4) driver 1.7.35) >>>> installed >>>> in a Pentium III 500 Mhz with 512 MB RAM (100 Mhz) running FreeBSD >>>> 5.4-RC3. >>>> The machine is routing traffic between multiple VLANs. Recently I >>>> did a >>>> benchmark with/without device polling enabled. Without device >>>> polling I was >>>> able to transfer roughly 180 Mbit/s. The router however was >>>> suffering when >>>> doing this benchmark. Interrupt load was peaking 100% - overall the >>>> system >>>> itself was quite unusable (_very_ high system load). With device >>>> polling >>>> enabled the interrupt kept stable around 40-50% and max transfer >>>> rate was >>>> nearly 70 Mbit/s. Not very scientific tests, but it gave me a pin >>>> point. >>>> >>>> However, a Pentium III in combination with a good NIC should in my >>>> opinion >>>> be a respectful router.. but I'm not satisfied with the results. >>>> The pf >>>> ruleset is like nothing, and the kernel is stripped and customized >>>> for best >>>> performance. >>>> >>>> Any tweaking tips for making my router perform better? >>>> >>>> Debug information: >>>> eivind@core-gw:~$ sysctl -a | grep kern.polling >>>> kern.polling.burst: 150 >>>> kern.polling.each_burst: 5 >>>> kern.polling.burst_max: 150 >>>> kern.polling.idle_poll: 0 >>>> kern.polling.poll_in_trap: 0 >>>> kern.polling.user_frac: 50 >>>> kern.polling.reg_frac: 20 >>>> kern.polling.short_ticks: 1411 >>>> kern.polling.lost_polls: 720 >>>> kern.polling.pending_polls: 0 >>>> kern.polling.residual_burst: 0 >>>> kern.polling.handlers: 0 >>>> kern.polling.enable: 1 >>>> kern.polling.phase: 0 >>>> kern.polling.suspect: 186 >>>> kern.polling.stalled: 0 >>>> kern.polling.idlepoll_sleeping: 1 >>>> >>>> eivind@core-gw:~$ cat /etc/sysctl.conf >>>> net.inet.ip.forwarding=1 >>>> net.inet.ip.fastforwarding=1 >>>> net.inet.carp.preempt=1 >>>> kern.polling.enable=1 >>>> >>>> HZ set to 1000 as recommended in README for the em(4) driver. >>>> Driver is of >>>> cource compiled into kernel. >>>> >>>> Regards, >>>> Eivind Hestnes >>>> >>>> _______________________________________________ >>>> freebsd-performance@freebsd.org mailing list >>>> http://lists.freebsd.org/mailman/listinfo/freebsd-performance >>>> To unsubscribe, send any mail to >>>> "freebsd-performance-unsubscribe@freebsd.org" >>>> >>>> >> >> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >> > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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