em0: watchdog timeout ...

[Robert Noland]

On Wed, 2007-11-14 at 10:15 -0500, Mike Tancsa wrote:
> At 03:58 PM 10/31/2007, Mike Tancsa wrote:
> >To: John Baldwin <jhb at freebsd.org>, freebsd-current at freebsd.org
> >From: Mike Tancsa <mike at sentex.net>
> >Subject: Re: em0: watchdog timeout ...
> >
> >At 04:21 PM 10/31/2007, John Baldwin wrote:
> >> >
> >> > em1 at pci1:0:1:   class=0x020000 card=0x115e8086 chip=0x105e8086
> >> > rev=0x06 hdr=0x00
> >> >      vendor     = 'Intel Corporation'
> >> >      device     = 'PRO/1000 PT'
> >> >      class      = network
> >> >      subclass   = ethernet
> >> >      cap 01[c8] = powerspec 2  supports D0 D3  current D0
> >> >      cap 05[d0] = MSI supports 1 message, 64 bit
> >> >      cap 10[e0] = PCI-Express 1 endpoint
> >> >
> >> > its also in FastE mode and not gigE. Not sure if that makes a
> >> > difference or not.
> >>
> >>What if you use MSI?
> >
> >How do I enable that ?
> 
> 
> 
> Just to follow up on this thread for the archives, enabling MSI does 
> indeed seem to stop, or at least mitigate watchdog timeouts.   Its 
> been almost 2 weeks on this one box and we have had zero watchdog timeouts.

I'm still getting these with MSI...

em0 at pci0:2:0:0: class=0x020000 card=0x02f61014 chip=0x108c8086 rev=0x03
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82573E Intel Corporation 82573E Gigabit Ethernet
Controller (Copper)'
    class      = network
    subclass   = ethernet
    cap 01[c8] = powerspec 2  supports D0 D3  current D0
    cap 05[d0] = MSI supports 1 message, 64 bit enabled with 1 message
    cap 10[e0] = PCI-Express 1 endpoint

rnoland-ibm% vmstat -i
interrupt                          total       rate
irq1: atkbd0                       87456          0
irq4: sio0                             2          0
irq6: fdc0                            10          0
irq14: ata0                      1896659         11
irq15: ata1                       422846          2
irq16: uhci3 drm0               10788636         63
irq22: pcm0                     15730204         92
irq23: uhci0 ehci0                258850          1
cpu0: timer                    338437976       1999
irq256: em0                      1363782          8
cpu1: timer                    338430141       1999
Total                          707416562       4180

FreeBSD rnoland-ibm.acs.internap.com 8.0-CURRENT FreeBSD 8.0-CURRENT
#112: Tue Nov  6 14:11:24 EST 2007
root at rnoland-ibm.acs.internap.com:/usr/obj/usr/src/sys/IBM  i386

em0: watchdog timeout -- resetting
em0: link state changed to DOWN
em0: link state changed to UP
em0: watchdog timeout -- resetting
em0: link state changed to DOWN
em0: link state changed to UP

It seems to occur when a new connection is being created, typically from
some fairly heavyweight application.  For example starting the acroread
plugin in firefox to download a PDF.  I haven't had time to try and
investigate it thoroughly, so this is all anecdotal.  But it is still
occurring with MSI.

robert.

> 
> # vmstat -i
> interrupt                          total       rate
> irq1: atkbd0                           6          0
> irq4: sio0                         59020          0
> irq17: em3                        225204          0
> irq19: atapci1                    243645          0
> cpu0: timer                   1985129675       1997
> irq256: em0                   1460563078       1470
> irq257: em1                      2360550          2
> irq258: em2                   1300707554       1309
> cpu1: timer                   1985084642       1997
> Total                         6734373374       6777
> 
> However, it *seems* to increase the amount of missed packets. But, 
> traffic patterns are a little higher, so I cant be certain.
> 
> em0: Missed Packets = 5514
> em0: Receive No Buffers = 1950
> em0: RX overruns = 9
> em2: Missed Packets = 220073
> em2: Receive No Buffers = 29034
> em2: RX overruns = 1498
> 
> 
>          ---Mike 
> 
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