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Date: Tue, 4 Oct 2011 21:01:00 -0400
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From: Arnaud Lacombe <lacombar@gmail.com>
To: Jack Vogel <jfvogel@gmail.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: em(4) hang [Was: Re: igb(4) won't start with "igb0: Could not
 setup receive structures"]
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Hi,

On Thu, Mar 31, 2011 at 9:51 AM, Arnaud Lacombe <lacombar@gmail.com> wrote:
> Hi
>
> [let's start a new thread :)]
>
> On Wed, Mar 30, 2011 at 2:22 PM, Jack Vogel <jfvogel@gmail.com> wrote:
>> Read the code in HEAD, em_local_timer() has a test of ALL the rx queues and
>> will schedule a task that refreshes mbufs if they are empty. This has
>> exactly the
>> same effect as checking for some interrupt cause, a cause that is not
>> available
>> when using MSIX on 82574, but this approach works for everything.
>>
> ok, it took me a long time to reproduce the issue with em(4) version
> 7.1.9, about 3h rather than a few minutes a month ago and only got
> ~875 allocations failure vs. several thousand before, here are some
> stats:
>
> # sysctl -a | grep missed
> dev.em.0.mac_stats.missed_packets: 1917112
> dev.em.1.mac_stats.missed_packets: 0
> dev.em.2.mac_stats.missed_packets: 0
> dev.em.3.mac_stats.missed_packets: 0
> dev.em.4.mac_stats.missed_packets: 0
> dev.em.5.mac_stats.missed_packets: 0
>
For the record, we had this issue at a customer today; the system was
still using the driver from 7-STABLE. Fortunately, it should just be a
matter of upgrading to the driver from HEAD, which we already know to
be good, to fix the issue.

Regards,
 - Arnaud