Messages in this thread | | | Date | Thu, 20 Mar 2003 23:54:21 +0000 (GMT) | From | Mel Gorman <> | Subject | Poor performance with pcnet32 on SMP |
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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/
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