netdev - Re: query: tcpdump versus atomic?

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Message-ID: <20091014085941.6897d9d9@nehalam>
Date:	Wed, 14 Oct 2009 08:59:41 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	William Allen Simpson <william.allen.simpson@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: query: tcpdump versus atomic?

On Wed, 14 Oct 2009 11:20:12 -0400
William Allen Simpson <william.allen.simpson@...il.com> wrote:

> William Allen Simpson wrote:
> > Anybody know what code path tcpdump changes to running atomic?
> > 
> > Is there a function to test whether you're running atomic?
> > 
> To partially answer my own question, after laboriously #if'ing compiling
> section by section, it affects the tcp_minisockets.c code at
> tcp_create_openreq_child().
> 
> I've not found a function to test.  I've found sk->sk_allocation, but
> that doesn't seem to be dynamically updated to reflect the current state.
> 
> Anyway, sorry David, but there's at least two GFP_ATOMIC here (one existing,
> one new).  I've managed to change the others, by careful rearrangement.  At
> least, I hope so, until some future testing reveals otherwise....
> 
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did you look at your ethernet's drivers code to turn on promiscuous mode.
It could be leaving irq's or bottom half disabled.

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