linux 2.6.16 routing problem

linux 2.6.16 routing problem

[Mayuresh Chitale]

Hi All,

I am doing routing performance test using smartbits tester. The
traffic is pumped by smartapplications (that runs on smartbits).  I
see that the routing goes on for some time, then the fps(pps) value
starts dropping until it becomes zero. This is for rates less than
10Mb/s and packet size 64 bytes. But same thing happens with various
packet sizes such as 256, 1024 etc.

When debugging I see that the function ip_finish_output2 (in
net/ipv4/ip_output.c) calls hh->hh_output.

At the start of the test hh->hh_output calls dev_queue_xmit so routing
goes on fine.

Then suddenly it starts calling neigh_resolve_output after which pps
value starts gradually decreasing and it finally reaches zero.

If anyone has solved similar problem or knows what causes this
problem, please let me know.

Any suggestion is welcome.

Thanks,
Mayuresh.

Re: linux 2.6.16 routing problem

[Brian F. G. Bidulock]

Mayuresh,

On Fri, 14 Jul 2006, Mayuresh Chitale wrote:
> 
> If anyone has solved similar problem or knows what causes this
> problem, please let me know.
> 
> Any suggestion is welcome.

Configure a static arp entry for the tester on the unit under test.
(Or configure the tester to respond to ARP queries.)

--brian