High interrupt rate on a PF box + performance

[Jeremy Chadwick]

On Thu, Jan 27, 2011 at 10:57:14AM +0100, Damien Fleuriot wrote:
> Hello list,
> 
> I have a problem with interrupts, network cards, and PF performance.
> 
> We have 2 firewalls running FreeBSD 8.0 for the current master and
> FreeBSD 8.1 for the backup host, which I upgraded just yesterday.
>
> [...]
> 
> vmstat -i
> ---
> interrupt                          total       rate
> irq14: ata0                           36          0
> irq16: mfi0                       353244          1
> irq21: uhci0 uhci+                461504          1
> cpu0: timer                    615183815       1996
> irq256: bce0                  1015412475       3295
> irq257: igb0                  1067318584       3464
> irq258: igb0                   695648752       2258
> irq259: igb0                           2          0
> irq260: igb1                    11503857         37
> irq261: igb1                      506598          1
> irq262: igb1                          69          0
> irq269: bce1                      790820          2
> cpu1: timer                    615183757       1996
> cpu2: timer                    615197165       1996
> cpu3: timer                    615197165       1996
> Total                         5252757843      17050

There are changes to the igb(4) driver which are in RELENG_8 (8-STABLE),
and some which will be in the upcoming 8.2-RELEASE, which may address
this.  Jack Vogel of Intel would be able to confirm for sure; CC'ing him
here.

Could you please provide output from the following commands?

* pciconf -lvcb  (only include igbX entries, thanks)
* sysctl -a | grep msi

Thanks.

I can't help with the CARP-related issues or other stuff you're
experiencing.  These issues may all be separate problems, hard to say.

-- 
| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.               PGP 4BD6C0CB |