On Sun, 2004-01-11 at 14:29, Jeff Garzik wrote:
> Douglas Pollock wrote:
> The kernel comes with "pktgen" which is a free packet generator you can
> use for stressing kernels and LANs. There is also ttcp, nttcp, various
> filesystems tests over NFS (such as bonnie++), various block device
> tests over nbd (network block device), ...
Thanks for that. I should have remembered the packet generator. Using
pktgen, I am able to reproduce the problem.
HARDWARE:
Intel P4 with hyper-threading enabled
Realtek 8169 (rev. 10)
Switched 100Mbps network
A second machine on the same network (to receive test packets)
SOFTWARE:
Kernel 2.6.0 or 2.6.1-rc1 (possibly others), with SMP for 2 processors,
Realtek 8169 driver, and packet generator
STEPS TO REPRODUCE:
1.) Set up the ipg script to send to the second machine on the 8169 NIC.
2.) pgset pkt_size 9014
3.) pg
OBSERVATIONS:
Soon after step #3, the 8169 NIC will stop responding (note: the netdev
watchdog reports a timeout in dmesg). No packets get through. However,
everything else still works. Disabling SMP in the kernel fixes this
problem.
Doug.
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