netdev - Re: pktgen and spin_lock

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Date:	Tue, 20 Oct 2009 05:48:10 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Greear <greearb@...delatech.com>
CC:	NetDev <netdev@...r.kernel.org>
Subject: Re: pktgen and spin_lock_bh in xmit path

Ben Greear a écrit :
> I'm having strange issues when running pktgen on 10G interfaces while
> also running
> pktgen on mac-vlans on that interface, when the mac-vlan pktgen threads
> are on a different
> CPU.
> 
> First, lockdep gives up and says that things are not properly
> annotated.  I believe this is because
> the macvlan tx path will lock it's txq and will also lock the
> lower-dev's txq.  To fix this, perhaps
> we need some new lockdep aware primitives for netdev txq locking?
> 
> Second, is using _bh() locking really sufficient if we have pktgen
> writing to a physical device
> and also have other pktgen threads writing to that same device though
> mac-vlans?   I'm seeing
> deadlocks spinning on the _bh() lock in pktgen as well as strange
> corruptions, so I think there
> must be *some* problem somewhere, I just don't know quite what it is yet.
> 

Could you please give us a copy if your pktgen scripts ?
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