Date: Wed, 22 Dec 1999 21:47:20 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Julian Elischer <julian@whistle.com>, "B. Scott Michel" <scottm@CS.UCLA.EDU>, Jonathan Lemon <jlemon@americantv.com>, Brad Knowles <brad@shub-internet.org>, Joe Abley <jabley@patho.gen.nz>, Poul-Henning Kamp <phk@critter.freebsd.dk>, Garrett Wollman <wollman@khavrinen.lcs.mit.edu>, freebsd-current@FreeBSD.ORG Subject: new linktest program avail (was Re: Odd TCP glitches in new currents) Message-ID: <199912230547.VAA16324@apollo.backplane.com> References: <Pine.BSF.4.10.9912222023410.50586-100000@current1.whistle.com> <199912230451.UAA15739@apollo.backplane.com>
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A new version of linktest is up, much enhanced:
* fixes cpu use problems due to calling random() too much
* fixes usleep (we now use a pipe and select())
This version can really stuff the network.
http://www.backplane.com/FreeSrc/linktest-1.1.c
Running the following tests with my LinkSys 5-port switch (I haven't
done this with the D-Link yet):
test3<->test4 only
test3# linktest -s 1200 -f8 test4
test4# linktest -s 1200 -f8 test3
11.9 MBytes/sec in both directions (23 MB/sec across the switch)
lander<->apollo only
lander# linktest -s 1200 -f8 apollo
apollo# linktest -s 1200 -f8 lander
4.5 MBytse/sec in both directions (10 MBytse/sec across the switch)
Now both tests running in parallel.
test3# linktest -s 1200 -f8 test4
test4# linktest -s 1200 -f8 test3
lander# linktest -s 1200 -f8 apollo
apollo# linktest -s 1200 -f8 lander
7.9 MBytes/sec in both directions for test3<->test4 (15 MB/sec)
(6300 pps in both directions - 12000 pps across the switch)
4.3 MBytes/sec in both directions for apollo<->lander (8.6 MB/sec)
(3500 pps in both directions - 7000 pps across the switch)
Interesting, eh? The test3<->test4 test slowed down when I ran the
apollo<->lander test. Still, the switch performs plenty good enough
for a tiny little 5-port item.
And... no packet loss in the test - except my TCP connection when I type
is still getting packet loss. Weeeird.
-Matt
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