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Date:      Wed, 2 Apr 2003 09:25:04 -0700 (MST)
From:      Fred Clift <fclift@verio.net>
To:        Maxime Henrion <mux@freebsd.org>
Cc:        alpha@freebsd.org
Subject:   Re: call for testers: busdma-ified fxp(4) driver
Message-ID:  <20030402090802.Y82002-400000@vespa.dmz.orem.verio.net>
In-Reply-To: <20030401134113.GC1750@elvis.mu.org>

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On Tue, 1 Apr 2003, Maxime Henrion wrote:

> > My fxp(4) patch should now be nearly commit ready.
...
> > someone with an alpha box and a fxp(4) card could test this  patch
>
> Sorry to follow-up to myself, but this patch had some bogus and
> irrelevant diffs in it.  I'm attaching a fixed one now.  It can also be
> found at http://mu.org/~mux/patches/if_fxp.patch.

Well, the patch seems to work just fine - better performance now in fact.

I did a bunch of scp/ftp type stuff of big and a bunch of small files just
to ensure everyting was working and then I used /usr/ports/net/netperf to
try and characterize performance a bit.  After you install the port there
is a script /usr/local/netperf/snapshot_script that tries to give a
reasonable snapshot of network performance under a variety of conditions,
and with a few different parameters...  The target machine was a 400Mhz
pentium II box (sadly, this and the alpha are the two fastest machines I
own...) with '4.7-STABLE FreeBSD 4.7-STABLE #5: Mon Nov 11 12:15:39 MST
2002' (+ a few security patches) with a newer fxp card

fxp0@pci0:9:0:  class=0x020000 card=0x000c8086 chip=0x12298086 rev=0x08
hdr=0x00

Both of these boxes plugged into an SMC 10/100 switch...  I would have
just used a cross-over cable except I forgot to bring it with me and
didn't feel like making one.

Attached to this email you'll find the output of snapshot_script for the
old driver (about two weeks old cvsup), the output of the modified driver,
and the output of the script run on the integrated dc NIC, just for fun
and comparison.

Some sample results at one particular set of parameters:

before: throughput in 10^6 bits/sec  39.18
after: throughput in 10^6 bits/sec   94.11
(dc):  throughput in 10^6 bits/sec   70.97


Honestly I'm suprised there is so much difference between the before and
after and I'm doubting my testing methodology -- perhaps I had the duplex
set wrong on the alpha on the 'before'?  shrug.  I didn't shut down, or
change at all, the target test box between the two tests. At any rate, the
patch seems to work fine on my alpha on the one card I had time to test
(older, slightly larger formfactor etherexpress pro 100).  If you can wait
till tomorrow, I can probably squeeze in time for testing one or two other
fxp hardware revs I have...

The card I did test on shows up as this:

pciconf -v -l
...
fxp0@pci1:8:0:  class=0x020000 card=0x00098086 chip=0x12298086 rev=0x04
hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82557/8/9 EtherExpress PRO/100(B) Ethernet Adapter'
    class    = network
    subclass = ethernet
...


Fred

--
Fred Clift - fclift@verio.net -- Remember: If brute
force doesn't work, you're just not using enough.

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--0-54798573-1049300704=:82002
Content-Type: TEXT/PLAIN; charset=US-ASCII; name="dc.out"
Content-Transfer-Encoding: BASE64
Content-ID: <20030402092504.Q82002@vespa.dmz.orem.verio.net>
Content-Description: similar test for dc(4) driver using the integrated NIC -
	baseline
Content-Disposition: attachment; filename="dc.out"

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--0-54798573-1049300704=:82002--



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