'no buffer space available' after switch goes down on freeBSD 7.3

[Ryan Stone]

On Fri, Dec 21, 2012 at 7:13 AM, Tsaregorodtsev Denis <telemat at extrim.it>wrote:

> Hello,
>
> I maintenance ISP's DNS server which works under FreeBSD 7.3 and BIND
> 9.9.1-P4. The network adapter is Intel(R) PRO/1000 Network Connection,
> driver - em. The server is connected to a Cisco 6500 switch. Sometimes the
> switch goes down (for maintenance) and is unavailable for 10 minutes. After
> the switch goes up the server is still unavailable through IP. When I open
> an IPMI console on the server and enter the ping command, I receive "no
> buffer space available" error message. And the network doesn't work until
> the server reboot.
> I tried to google this and found that the problem can be solved by
> increasing nmbclusters parameter. But I want to understand why this problem
> appears when the switch is rebooting . May be you can suggest something?
>
> Best regards, Tsaregorodtsev Denis
>
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Do you have a non-production machine you can test with?  Can you confirm
that the follow (compile-tested only) patch of 7.3 resolves the issue:

http://people.freebsd.org/~rstone/patches/e1000_link.diff