Debugging em(4) driver

[Mike Tancsa]

On 11/13/2010 9:35 PM, Patrick Mahan wrote:
> 
> 
> On 11/13/2010 02:27 PM, Ryan Stone wrote:
>> It looks to me that you're getting a ton of input drops.  That's
>> presumably the cause of your issue.  You can get the em driver to
>> print debug information to the console by running:
>>
>> # sysctl dev.em.3.stats=1
>> # sysctl.dev.em.3.debug=1
>>
>> The output should be available in dmesg and /var/log/messages
>>
>> Hopefully that can shed some light on the nature of the drops.
> 
> Ryan,
> 
> Thanks for the tip.  But I see I forgot to mention this was FreeBSD 8.0.
> The em(4) driver is actually the one found in FreeBSD 8.1 as we needed
> the AltQ fixes.
> 

Try grabbing the em drivers from HEAD.  They fixed a few bugs for me.
You should be able to grab all of /usr/src/sys/dev/e1000 from HEAD and
drop it in to RELENG_8 and compile

	---Mike