Performance Intel Pro 1000 MT (PWLA8490MT)

[Bosko Milekic]

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 at technokratis.com
bmilekic at FreeBSD.org