kern/64556: [sis] if_sis short cable fix problems with NetGear FA311's

[Thomas Hurst]

The following reply was made to PR kern/64556; it has been noted by GNATS.

From: Thomas Hurst <tom at hur.st>
To: Volker <volker at vwsoft.com>
Cc: bug-followup at FreeBSD.org
Subject: Re: kern/64556: [sis] if_sis short cable fix problems with NetGear
	FA311's
Date: Mon, 18 Feb 2008 14:07:27 +0000

 Testing with Linux shows that receive seems to be throttled during
 bidirectional activity.  Unidirectional sees 93Mbps in either direction,
 bidirectional sees 93Mbps sending and 35-60Mbps (50 average) receiving.
 
 There's no sign of connection dropping in an hour of testing.
 
 Linux is spewing APIC errors at me, not sure what, if anything, they're
 related to.
 
 A quick glance at the FreeBSD driver shows a DELAY(100000); which
 probably accounts for the performance drops; each burst of 'short cable
 fix' messages basically leaves the card idle for 300ms or so.  The Linux
 driver (drivers/net/natsemi.c) has no sign of such a delay.
 
 This all happens during card setup, sis_initl(), shouldn't this be only
 happening once when it aquires the link, not randomly during operation?
 Watchdog timeouts excepted, but there's no sign of them.
 
 -- 
 Thomas 'Freaky' Hurst
     http://hur.st/