kern/72293: de(4) NIC performance degradation with debug.mpsafenet=1

[Kris Kennaway]

The following reply was made to PR kern/72293; it has been noted by GNATS.

From: Kris Kennaway <kris at obsecurity.org>
To: Philip Murray <pmurray at nevada.net.nz>
Cc: FreeBSD-gnats-submit at FreeBSD.org
Subject: Re: kern/72293: de(4) NIC performance degradation with debug.mpsafenet=1
Date: Wed, 13 Oct 2004 16:44:09 -0700

 On Mon, Oct 04, 2004 at 05:43:18PM +1300, Philip Murray wrote:
 
 > >Description:
 >     After booting the interface will work for a short time, as traffic passes through it, it suddenly gets very slow and unuseable.
 >     Unable to SSH over 100Mbit to it and doesn't respond to pings.
 > 
 >     Booting with debug.mpsafenet=0 in /boot/loader.conf resolves it.
 > >How-To-Repeat:
 >     Boot with debug.mpsafenet=1 with a de(4) NIC
 > 
 > >Fix:
 > 
 >     Boot with debug.mpsafenet=0
 
 FYI, the de driver indeed has locking problems - this will hopefully be addressed by 5.3.
 
 Kris