--- Ben Greear <greearb@candelatech.com> wrote:

Danial Thom wrote:

quoted

I think the concensus is that 2.6 has made

trade

quoted

offs that lower raw throughput, which is what

a

quoted

networking device needs. So as a router or
network appliance, 2.6 seems less suitable. A

raw

quoted

bridging test on a 2.0Ghz operton system:

FreeBSD 4.9: Drops no packets at 900K pps
Linux 2.4.24: Starts dropping packets at 350K

pps

quoted

Linux 2.6.12: Starts dropping packets at 100K

pps

I ran some quick tests using kernel 2.6.11, 1ms
tick (HZ=1000), SMP kernel.
Hardware is P-IV 3.0Ghz + HT on a new
SuperMicro motherboard with 64/133Mhz
PCI-X bus.  NIC is dual Intel pro/1000.  Kernel
is close to stock 2.6.11.

I used brctl to create a bridge with the two
GigE adapters in it and
used pktgen to stream traffic through it
(250kpps in one direction, 1kpps in
the other.)

I see a reasonable amount of drops at 250kpps
(60 byte packets):
about 60,000,000 packets received, 20,700
dropped.

Interestingly, the system is about 60% idle
according to top,
and still dropping pkts, so it would seem that
the system could
be better utilized!

Ben

What GigE adapters did you use? Clearly every
driver is going to be different. My experience is
that a 3.4Ghz P4 is about the performance of a
2.0Ghz Opteron. I have to try your tuning script
tomorrow.

If your test is still set up, try compiling
something large while doing the test. The drops
go through the roof in my tests.

Danial


		
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