Re: Performance Intel Pro 1000 MT (PWLA8490MT)

From: Eivind Hestnes (eivind.hestnes_at_stabbursmoen.no)
Date: 04/19/05

  • Next message: Michael DeMan: "Re: Performance Intel Pro 1000 MT (PWLA8490MT)" 
    Date: Tue, 19 Apr 2005 22:40:00 +0200
To: Jerald Von Dipple <jerry.walsh@gmail.com>

    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"
    >>
    >>
    >>

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