em(4) stops forwarding

[Michal Mertl]

Scott Long wrote:
> Michal Mertl wrote:
> > Scott Long wrote:
> > 
> >>Michal Mertl wrote:
> >>
> >>>Hello,
> >>>
> >>>I've been running CURRENT for long time and never experienced problem
> >>>with the built-in em(4) card before. Recently (I first noticed it on Jan
> >>>24) the card has stopped working several times. Nothing gets into the
> >>>log file. Carrier is still detected properly but no data is exchanged.
> >>>Ifconfig up/down doesn't help but kldunload/load does. When I run
> >>>tcpdump I don't see any packet coming in but I see some outgoing.
> >>>
> >>>Can someone suggest what to look at when it happens the next time? I
> >>>have DDB compiled in. I will try to sniff the wire using another machine
> >>>next time to see if the card sends out anything.
> >>>
> >>>The command 'pciconf -lv' says about the card this:
> >>>em0 at pci2:1:0:   class=0x020000 card=0x05491014 chip=0x101e8086 rev=0x03
> >>>hdr=0x00
> >>>    vendor   = 'Intel Corporation'
> >>>    device   = '82540EP Gigabit Ethernet Controller (Mobile)'
> >>>    class    = network
> >>>    subclass = ethernet
> >>>
> >>>The dmesg:
> >>>em0: <Intel(R) PRO/1000 Network Connection Version - 3.2.18> port
> >>>0x8000-0x803f mem 0xc0220000-0xc023ffff,0xc0200000-0xc020ffff irq 11 at
> >>>device 1.0 on pci2
> >>>em0: Ethernet address: 00:0d:60:cd:ae:e2
> >>>em0: [FAST]
> >>>
> >>>The interrupt is shared since the machine is a notebook. I don't know if
> >>>it was just a coincidence but I think that it happened at the same time
> >>>as my USB mouse stopped working - the USB controller is on the same irq.
> >>>
> >>>Michal
> >>>
> >>
> >>What is sharing the interrupt?
> > 
> > 
> > vgapci0, ipw0, ehci0, uhci0-2. I don't think vgapci0 and ipw0 are really
> > using the interrupt when I use em0.
> > 
> > 
> 
> Ouch.  For now, edit /sys/dev/em/if_em.c and add the following line to 
> the top of the file:
> 
> #define NO_EM_FASTINTR

Do you know the reason of the problem? Wouldn't it be better if I used
stock driver and got some information for you when it doesn't work? I
use the machine as my workstation so it isn't such a big problem when it
looses the network.

> Also, does your kernel config include the apic device?

Yes, it does. But I believe that the chipset doesn't have it and neither
the CPU supports it.

Michal