Re: Performance Intel Pro 1000 MT (PWLA8490MT)

From: Bosko Milekic (bmilekic_at_technokratis.com)
Date: 04/20/05

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    Date: Wed, 20 Apr 2005 10:55:19 -0400
To: "Jin Guojun [VFFS]" <g_jin@lbl.gov>

    On Tue, Apr 19, 2005 at 08:56:03PM -0700, Jin Guojun [VFFS] wrote:
    > Bruce Evans wrote:
    >
    > >On Tue, 19 Apr 2005, Bosko Milekic wrote:
    > >
    > >> 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
    > >
    > >
    > >A 64-bit bus doesn't seem to be essential for reasonable performance.
    > >
    > >I get about 210 kpps (receive) for a bge card on an old Athlon system
    > >with a 32-bit PCI 33MHz bus. Overclocking this bus speeds up at least
    > >sending almost proportionally to the overclocking :-). This is with
    > >my version of an old version of -current, with no mpsafenet, no driver
    > >tuning, and no mistuning (no INVARIANTS, etc., no POLLING, no HZ > 100).
    > >Sending goes slightly slower (about 200 kppps).
    >
    > Yes, 64-bit is not essential for getting 400~700 Mbps as long as the system
    > has enough high memory bandwidth, but it is essential to get full Gigabits.
    >
    > Simple numbers are in "Tips" section at the bottom of the following page:
    >
    > http://www-didc.lbl.gov/NCS/generic/ncs-00.html
    >
    > and the details are described in the papers linked.
    >
    > P.S. Question the unit "kpps" used in original email. I am not sure
    > what this really means.
    > GigE is possible to produce 400 kpps if packet size is 300
    > bytes or less.
    > If packet size is 1500 byte, the maximum pps is 83k (83kpps).
    > But, 200-400 kbps is kind low, maybe I missed some previous
    > emails.

       Obviously we're talking about small packets. :-) 

    -- 
Bosko Milekic
bmilekic@technokratis.com
bmilekic@FreeBSD.org
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