Date: Tue, 7 Sep 1999 21:23:43 +0200 From: Andre Albsmeier <andre.albsmeier@mchp.siemens.de> To: Peter Jeremy <jeremyp@gsmx07.alcatel.com.au> Cc: hardware@FreeBSD.ORG Subject: Re: Decent 100baseTX PCMCIA card wanted Message-ID: <19990907212343.A99954@internal> In-Reply-To: <99Sep6.105734est.40333@border.alcanet.com.au> References: <99Sep6.105734est.40333@border.alcanet.com.au>
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On Mon, 06-Sep-1999 at 10:59:26 +1000, Peter Jeremy wrote:
> Does anyone have any suggestions for a PCMCIA card that can snoop a
> heavily loaded 100baseTX LAN using a Celeron/300.
>
> I've tried a 3Com 3C574BT, but it's far too slow (basically, it can
> just keep up with a 10baseT network).
I just asked the same question on -mobile. I have got an
"Intel" "EtherExpress(TM) PRO/100 PC C" but I can't get more
than about 1.3 MBytes/sec through it. It appears to be a driver/hardware
issue:
/*
* Card interrupt handler: should return true if the interrupt was for us, in
* case we are sharing our IRQ line with other devices (this will probably be
* the case for multifunction cards).
*
* This function is probably more complicated than it needs to be, as it
* attempts to deal with the case where multiple packets get sent between
* interrupts. This is especially annoying when working out the collision
* stats. Not sure whether this case ever really happens or not (maybe on a
* slow/heavily loaded machine?) so it's probably best to leave this like it
* is.
*
* Note that the crappy PIO used to get packets on and off the card means that
* you will spend a lot of time in this routine -- I can get my P150 to spend
* 90% of its time servicing interrupts if I really hammer the network. Could
* fix this, but then you'd start dropping/losing packets. The moral of this
* story? If you want good network performance _and_ some cycles left over to
* get your work done, don't buy a Xircom card. Or convince them to tell me
* how to do memory-mapped I/O :)
*/
and
/*
* Now get the packet, including the Ethernet header and trailer (?)
* We use programmed I/O, because we don't know how to do shared
* memory with these cards. So yes, it's real slow, and heavy on
* the interrupts (CPU on my P150 maxed out at ~950KBps incoming).
*/
Since it is named EtherExpress I thought it would be a good deal :-(
-Andre
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