I had a similar experience. I was running 2.2.14 on a PIII-600, using FastE
NICs, and using ttcp and netperf between machines on both sides of the linux
router. I was able to push wire speeds, but that was only at MTU-sized
packets.
When I used small UDP packets, the router started choking on 40Kpps.
Unfortunately, the testing tools overloaded the Linux router, and I had to
abandon the test for the sake of my own sanity.
----
Dani Roisman
[EMAIL PROTECTED]
> -----Original Message-----
> From: Ali Irfan-FIA225 [SMTP:[EMAIL PROTECTED]]
> Sent: Friday, July 07, 00 1:05 PM
> To: '[EMAIL PROTECTED]'
> Cc: Singh Ajoy-ASINGH1
> Subject: Routing performance monitoring
>
>
> I am doing experiments to test out Linux's forwarding performance. I have
> a
> Linux box setup in the forwarding mode, to which I have connected a source
> and a sink (two other Linux boxes) (100 BT Ethernet). At around 20 K pps
> (64
> bytes), the CPU utilization of the Linux router box is 26 %, but the Linux
> router starts dropping packets. When I debug using netstat, I see that the
> router is receiving 20 K packets (in 1 sec) , but is forwarding fewer than
> 20 K packets. But netstat does not report any drops at the output
> interface
> or any collisions.
>
> Are there any tools which could help locate the problem? Are there any
> test
> results for Linux router's performance on different machines? Also are
> there
> pointers to improve the forwarding performance of the routing code.
>
> Thanks.
>
> Irfan
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