Subject: Re: nfe(4) hardware checksum support
To: Izumi Tsutsui <>
From: Jared D. McNeill <>
List: tech-kern
Date: 02/04/2007 10:56:57
On 3-Feb-07, at 10:46 PM, Izumi Tsutsui wrote:

> wrote:
>> I applied the patch today and built a new kernel from the -current  
>> sources
>> of today.  Unfortunately, the patch doesn't seem to fix the problem.
>> When accessing two NFS servers simultaneously, packet reception stops
>> every now and then for about 30 seconds at a time.
> Hmm, I'm afraid it's difficult to debug it only by code inspection,
> but could you check which TX or RX could cause problem (by ttcp etc.)
> and interrupt/network statistics during stall (by vmstat -i or
> netstat -i etc.)?
> If FreeBSD or OpenBSD have the similar problem, maybe
> we need chip docs (there are several magic in the source).

Not sure if it's related, but you might want to have a look at the  
DragonFly modifications to the nfe driver to prevent watchdog timeouts: