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Date: Mon, 7 Feb 2011 15:43:25 -0500
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From: Karim Fodil-Lemelin <fodillemlinkarim@gmail.com>
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Subject: Fwd: igb driver tx hangs when out of mbuf clusters
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apologies if this gets in twice.

---------- Forwarded message ----------
From: Karim Fodil-Lemelin <fodillemlinkarim@gmail.com>
Date: 2011/2/7
Subject: Re: igb driver tx hangs when out of mbuf clusters
To: Lev Serebryakov <lev@serebryakov.spb.ru>
Cc: freebsd-net@freebsd.org


2011/2/7 Lev Serebryakov <lev@serebryakov.spb.ru>

Hello, Karim.
> You wrote 7 =C6=C5=D7=D2=C1=CC=D1 2011 =C7., 19:58:04:
>
>
> > The issue is with the igb driver from 7.4 RC3 r218406. If the driver ru=
ns
> > out of mbuf clusters it simply stops receiving even after the clusters
> have
> > been freed.
>   It looks like my problems with em0 (see thread "em0 hangs without
>  any messages like "Watchdog timeout", only down/up reset it.")...
>  Codebase for em and igb is somewhat common...
>
> --
> // Black Lion AKA Lev Serebryakov <lev@serebryakov.spb.ru>
>
> I agree.

Do you get missed packets in mac_stats (sysctl dev.em | grep missed)?

I might not have mentioned but I can also 'fix' the problem by doing
ifconfig igb0 down/up.

I will try using POLLING to 'automatize' the reset as you mentioned in your
thread.

Karim.