Date: Wed, 19 Dec 2001 11:36:13 +0100 From: "Petr Holub" <hopet@ics.muni.cz> To: "Christian Kratzer" <ck@cksoft.de> Cc: <freebsd-hackers@FreeBSD.ORG> Subject: RE: tx driver Message-ID: <001b01c18878$fb3f7ea0$2603fb93@kloboucek> In-Reply-To: <Pine.LNX.4.33.0112182204480.1454-100000@hirvi.cksoft.de>
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Hi!
I'd like to apologize for my cross-posting: if there is some following
debate I'd like to move it to freebsd-hackers.
> the usual problem with this kind of performance with any driver
> is failed full/half duplex negotiation. Please try manually forcing your
> card to half or full duplex
>
> Add one of
> -mediaopt full-duplex
> or
> -mediaopt half-duplex
>
> depending on the setting of your switch to your ifconfig line in /etc/rc.conf
>
> This is the single most common cause of really low ethernet performance.
> I have had good experiences with the tx driver on 4.3 ond 4.4 releases.
Well - this is the answer I got from almost everybody. My answer for this
is: no, it's not about the duplex problems :-(. I should have describe those
problems in more detailed way:
- this is not general behavior: the card gets about 11,6 MBps throughput
using netperf tests
- this problem arises in quite obscure conditions:
- either on routers (FreeBSD machine with this SMC card is acting
as PC router) where the network load rises over certain values
(but this is hard to simulate :-( )
- when I check out large CVS tree on my own machine with this
card: the symptoms here are
1) rather fast start
2) then it gradually reduces speed (even much less than mentioned
200 kBps - it decreases to few kBps)
3) end up with overall run time more than 10x higher than
it is on all other comparable machines :-(
So - is there anybody experiencing similar problems?
Best regards and thanks,
Petr
================================================================
Petr Holub
CESNET z.s.p.o. Supercomputing Center Brno
Zikova 2 Institute of Compt. Science
10200 Praha, CZ Masaryk University
Czech Republic Botanicka 68a, 60200 Brno, CZ
e-mail: Petr.Holub@cesnet.cz phone: +420-5-41512278
e-mail: hopet@ics.muni.cz
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