Re: Performance Intel Pro 1000 MT (PWLA8490MT)

From: Bosko Milekic (bmilekic_at_technokratis.com)
Date: 04/19/05

  • Next message: Arne : "Re: Performance Intel Pro 1000 MT (PWLA8490MT)" 
    Date: Tue, 19 Apr 2005 17:46:44 -0400
To: Petri Helenius <pete@he.iki.fi>

      My experience with 6.0-CURRENT has been that I am able to push at
      least about 400kpps INTO THE KERNEL from a gigE em card on its own
      64-bit PCI-X 133MHz bus (i.e., the bus is uncontested) and that's
      basically out of the box GENERIC on a dual-CPU box with HTT disabled
      and no debugging options, with small 50-60 byte UDP packets.

      I haven't measured how many I can push THROUGH to a second card and
      forward. That will probably reduce numbers.

      My tests were done without polling so with very high interrupt load
      and that also sucks when you have a high-traffic scenario.

      But still, way better than your numbers.

      Also, make sure you are not bottlenecking on the sender-side. e.g.,
      make sure that your sender can actually push out more PPS than what
      you appear to be bottlenecking on in the router.

    -Bosko

    On Wed, Apr 20, 2005 at 12:12:00AM +0300, Petri Helenius wrote:
    > Eivind Hestnes wrote:
    >
    > >It's correct that the card is plugged into a 32-bit 33 Mhz PCI slot.
    > >If i'm not wrong, 33 Mhz PCI slots has a peak transfer rate of 133
    > >MByte/s. However, when pulling 180 mbit/s without the polling enabled
    > >the system is very little responsive due to the interrupt load. I'll
    > >try to increase the polling frequency too see if this increases the
    > >bandwidth with polling enabled.. Thanks for the advice btw..
    > >
    > There is something "interesting" going on in the em driver but I haven't
    > had the time to profile it properly and Intel has been less than
    > forthcoming with the specification which makes it more challenging to
    > try to optimize the driver further.
    >
    > Pete
    >
    > >- E.
    > >
    > >Jon Noack wrote:
    > >
    > >>On 4/19/2005 1:32 PM, Eivind Hestnes wrote:
    > >>
    > >>>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.
    > >>
    > >>
    > >>
    > >>The card is plugged into a 32-bit PCI slot, correct? If so, 180
    > >>Mbit/s is decent. I have a gigabit LAN at home using Pro 1000 MTs
    > >>(in 32-bit PCI slots) and get NFS transfers maxing out around 23
    > >>MB/s, which is ~180 Mbit/s. Gigabit performance with 32-bit cards is
    > >>atrocious. It reminds me of the old 100 Mbit/s ISA cards...
    > >>
    > >>><snip>
    > >>>
    > >>>HZ set to 1000 as recommended in README for the em(4) driver. Driver
    > >>>is of
    > >>>cource compiled into kernel.
    > >>
    > >>
    > >>
    > >>You'll need HZ set to more than 1000 for gigabit; bump it up to at
    > >>least 2000. That should increase polling throughput a lot. I'm not
    > >>sure about other polling parameters, however.
    > >>
    > >>Jon
    > >
    > >
    > >
    > >_______________________________________________
    > >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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    -- 
Bosko Milekic
bmilekic@technokratis.com
bmilekic@FreeBSD.org
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