[84619] in North American Network Operators' Group
Re: image stream routers
daemon@ATHENA.MIT.EDU (Edward B. Dreger)
Sat Sep 17 20:19:11 2005
Date: Sun, 18 Sep 2005 00:17:33 +0000 (GMT)
From: "Edward B. Dreger" <eddy+public+spam@noc.everquick.net>
To: nanog@merit.edu
In-Reply-To: <20050917.191114.74675425.sthaug@nethelp.no>
Errors-To: owner-nanog@merit.edu
> Date: Sat, 17 Sep 2005 19:11:14 +0200 (CEST)
> From: sthaug@net...
>> A collegue smartbits tested a 1GHz pc, with a full feed and 250k
>> simoultaneons flows it managed around 250kpps. This also with freebsd
>> and device polling. It sounds to me like a software based machine can
>> be plenty fast with good code under the hood.
Stock BSD (and Linux) routing code are hardly optimal. With some
effort, 210 clk/lookup on a P4 Prescott is doable under a fairly
stressful test case.
I'd have to go back and dig up details, but that was FIB in < 512 kB,
135 kroute (full table at the time), ~600 different next-hop
possibilities, choosing mostly packets with valid next-hop (which was
slower than !N packets). Test was in userland with 4 kB pages, so there
was a fair amount of TLB churn; I didn't test with large pages.
Stock *ix, however, is a much different story. ;-)
> Sorry, in today's world of high-end routers 250kpps doesn't qualify as
> "plenty fast". Can your box do linerate Gigabit Ethernet with minimum
> size packets, on several ports simultaneously?
Alternatively, one can have a "production" GigE port and a "backplane"
GigE port that connects to an ethernet switch, essentially making each
router an intelligent single-port GigE blade.
Eddy
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