FreeBSD 9.3 - Intel X520-SR2 stops passing packets

[Guy Helmer]

> On May 21, 2015, at 8:52 AM, Christopher Forgeron <csforgeron at gmail.com> wrote:
> 
> A few things:
> 
> 1) How long before you have this behaviour?
> 
> 2) What's the output of 'netstat -m' when you have the problem?
> 
> 3) What is your MTU set to, and do you have TSO on or off?
> 
> On Thu, May 21, 2015 at 10:33 AM, Guy Helmer <guy.helmer at gmail.com <mailto:guy.helmer at gmail.com>> wrote:
> I’ve noticed that there have been reports of problems with Intel X520-SR2 network interfaces stopping working. I think I’m seeing a similar issue where the 10Gb interfaces stop receiving traffic (they’re being used in promiscuous mode to sniff traffic from a tap). ifconfig shows the interfaces are still active and the links are OK. ifconfig down/up restores activity. I’ve changed hw.intr_storm_threshold=8000 but I couldn’t tell if the interrupt storm threshold had been triggered at the time the interfaces stopped passing traffic.

It seems to run from hours to days without problems.

I don’t have the output of “netstat -m” available, but it did not indicate any mbuf or cluster allocation failures. No jumbo clusters (4k, 9k, or 16k) were allocated.

MTU is 1500. TSO is “on” but would seem to be irrelevant — no packets are transmitted out of these interfaces (verified using “netstat -i”).

Thanks,
Guy