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Date:      Mon, 07 Nov 2016 17:21:57 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-net@FreeBSD.org
Subject:   [Bug 213257] Crash in IGB driver with ALTQ
Message-ID:  <bug-213257-2472-HK2YsTerDT@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-213257-2472@https.bugs.freebsd.org/bugzilla/>
References:  <bug-213257-2472@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D213257

freebsd@mcwest.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |freebsd@mcwest.org

--- Comment #10 from freebsd@mcwest.org ---
ALTQ requires the legacy single-queue mode in the igb(4) driver, but it see=
ms
this mode is unstable with high-bandwidth traffic.  However, ALTQ may still=
 be
used by adding a queue to limit throughput through igb interfaces.  For
example, the following workaround has prevented crashes on my systems for t=
he
last six months:

     ## Limit bandwidth on internal interface to avoid igb driver bug
     altq on $int_if cbq bandwidth 404Mb queue { internal }
     queue internal bandwidth 99% priority 1 cbq(default red borrow)

--=20
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