Date: Thu, 17 Aug 2006 13:32:42 +0900 From: Pyun YongHyeon <pyunyh@gmail.com> To: Daniel Ryslink <daniel.ryslink@col.cz> Cc: freebsd-net@freebsd.org Subject: Re: Problems with em interfaces on FreeBSD 6.1 Message-ID: <20060817043242.GF49739@cdnetworks.co.kr> In-Reply-To: <20060811100536.V80282@k2.vol.cz> References: <20060811100536.V80282@k2.vol.cz>
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On Fri, Aug 11, 2006 at 10:06:00AM +0200, Daniel Ryslink wrote:
>
> Hello,
>
> We have currently upgraded one of our routers to Gigabit connectivity and
> FreeBSD 6.1 Release.
>
> The hardware is Supermicro SuperServer 5015M-T - we have tried both the
> integrated NIC and yet another external Intel NIC - specifically
>
> Intel PRO/1000 MT Dual Port Server Adapter
> PWLA8492MT
>
> The problem is that several times a day, the following appears in
> messages:
>
> Aug 11 08:41:44 b2 kernel: em0: watchdog timeout -- resetting
>
> accompanied with a loss of connectivity lasting for several seconds.
>
> We have tried using both the default driver that came with the FreeBSD
> installation as well as the newest driver from Intel dated 2th April 2006
> compiled as a module, but the problem still persists.
>
> If anyone encountered the problem and has a solution, I would be very
> grateful.
>
Because I can't reproduce it here and I failed to find a possible
cause of the issue.
As a last resort would you give attached patch a try?
The patch was generated against latest stable.
--
Regards,
Pyun YongHyeon
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--- if_em.c.orig Fri Aug 11 10:56:10 2006
+++ if_em.c Thu Aug 17 13:27:43 2006
@@ -943,6 +943,15 @@
return;
}
+ /* Relaim pending Tx descriptors */
+ em_txeof(adapter);
+ if (adapter->num_tx_desc_avail == adapter->num_tx_desc) {
+ device_printf(adapter->dev,
+ "Missing Tx completion interrupt!\n");
+ EM_UNLOCK(adapter);
+ return;
+ }
+
if (em_check_for_link(&adapter->hw) == 0)
device_printf(adapter->dev, "watchdog timeout -- resetting\n");
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