Re: Poor performance with pcnet32 on SMP

[Willy Tarreau]

Hello,
 
> I have being noticing some seriously poor network performance with SMP
> enabled. The machine is a xSeries 350 with quad xeon procesors. Under UP,
> I get decent transfer rates but with SMP enabled, it won't get over 2kB/s.
> I tried binding interrupts to one processor with

I've already had problems with pcnet32 (but they were 79c971). Basically,
connected to a 100 full-duplex, they would suddenly switch back to half
duplex under heavy load, and then I got very very low speeds of course.

Since yours works in UP, this may not be related to the same problem, but who
knows ?  I see in your dmesg that the card is connected to a 10 half link. Have
you tried a 100 Mbps just in case ?

Regards,
Willy