image stream routers
Edward B. Dreger
eddy+public+spam at noc.everquick.net
Sun Sep 18 00:17:33 UTC 2005
> Date: Sat, 17 Sep 2005 19:11:14 +0200 (CEST)
> From: sthaug at 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
--
Everquick Internet - http://www.everquick.net/
A division of Brotsman & Dreger, Inc. - http://www.brotsman.com/
Bandwidth, consulting, e-commerce, hosting, and network building
Phone: +1 785 865 5885 Lawrence and [inter]national
Phone: +1 316 794 8922 Wichita
________________________________________________________________________
DO NOT send mail to the following addresses:
davidc at brics.com -*- jfconmaapaq at intc.net -*- sam at everquick.net
Sending mail to spambait addresses is a great way to get blocked.
Ditto for broken OOO autoresponders and foolish AV software backscatter.
More information about the NANOG
mailing list