From owner-freebsd-current  Wed Dec 22 21:47:23 1999
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Date: Wed, 22 Dec 1999 21:47:20 -0800 (PST)
From: Matthew Dillon <dillon@apollo.backplane.com>
Message-Id: <199912230547.VAA16324@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)
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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