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
echo 1 > /proc/irq/16/smp_affinity
which, according to mail archives fixed the problem for other people, but
the result is the same. A CVS checkout from a server on the local lan of a
source tree less than 1MB took over an hour to complete but under UP
completes in about 2 seconds. This occurs with both 2.4.20 and 2.5.64.
In case it is relevant, the dmesg output related to the card on 2.5.64 is
pcnet32.c:v1.27b 01.10.2002 tsbogend@alpha.franken.de
pcnet32: PCnet/FAST III 79C975 at 0x2200, 00 02 55 fc 6d 21 assigned IRQ 16.
eth0: registered as PCnet/FAST III 79C975
pcnet32: 1 cards_found.
eth0: link up, 10Mbps, half-duplex, lpa 0x0021
Module pcnet32 cannot be unloaded due to unsafe usage in include/linux/module.h:457
Any suggestions on how to fix this are appreciated
-- Mel Gorman - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sun Mar 23 2003 - 22:00:33 EST