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From: Robert Watson <rwatson@FreeBSD.org>
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To: Scott Long <scottl@samsco.org>
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Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org,
	John Baldwin <jhb@FreeBSD.org>, Kris Kennaway <kris@obsecurity.org>
Subject: Re: cvs commit: src/sys/kern kern_intr.c
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On Fri, 2 Mar 2007, Scott Long wrote:

>>> Actually, having this helped detect a problem with a CAM driver.
>> 
>> I saw it under normal operation when doing a lot of loopback traffic on an 
>> 8-core.
>
> I thought that the netisr was essentially disabled in 7-CURRENT.

The netisr is not used for direct network input from ithreads in 7.x, but it 
is used for loopback traffic, tunneled traffic (various types of 
encapsulation), etc, where traffic is re-injected into the stack.  This avoids 
recursion, etc.

Robert N M Watson
Computer Laboratory
University of Cambridge