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From: Jun Sun <jsun@mvista.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-mips@oss.sgi.com, Ralf Baechle <ralf@oss.sgi.com>,
	marcelo@conectiva.com.br
Subject: Re: [2.4 PATCH] pcnet32.c - tx underflow error
Date: Wed, 10 Jul 2002 17:08:35 -0700	[thread overview]
Message-ID: <3D2CCC83.6090304@mvista.com> (raw)
In-Reply-To: E17SRFB-00087H-00@the-village.bc.nu

Alan Cox wrote:

>>This patch fixes a tx underflow error for 79c973 chip.  It essentially delay 
>>the transmission until the whole packet is received into the on-chip sdram.
>>
>>The patch is already accepted by Marcelo for the 2.4 tree, I think.
>>
> 
> Which slows the stuff down for people with real computers.



BTW, I have seen this problem on four boards (including Malta, two NEC boards 
and a Hitachi board).  Not surprisingly the problem mostly happens when you 
connect to 100Mb/s network.

I even suspect this is the default setting on PCI cards on PC.  Can someone 
verify?  If that is the case, that will explain why driver never sets this 
bit.  Maybe we don't have any "real computers" after all. :-)

Jun

  parent reply	other threads:[~2002-07-11  0:11 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-07-10 21:56 [2.4 PATCH] pcnet32.c - tx underflow error Jun Sun
2002-07-10 23:51 ` Alan Cox
2002-07-10 23:51   ` Alan Cox
2002-07-10 23:51   ` Jun Sun
2002-07-11  2:21     ` Alan Cox
2002-07-11  2:21       ` Alan Cox
2002-07-11  3:01     ` Jason Gunthorpe
2002-07-11  0:08   ` Jun Sun [this message]
2002-07-11  2:16     ` Alan Cox
2002-07-11  2:16       ` Alan Cox
2002-07-11  8:12       ` Thomas Bogendoerfer
2002-07-12  2:51   ` Marcelo Tosatti
2002-07-12  2:51     ` Marcelo Tosatti
2002-07-12 18:26     ` Jun Sun

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