network hang using intel em nic

[Allan Jude]

On 2014-09-08 13:14, Steve Wills wrote:
> Hi,
> 
> I've got some new hardware and have been experiencing lockups using the em
> driver. They seem to only happen on large downloads, smaller things like ssh
> and web browsing work OK. The hardware is:
> 
> em0 at pci0:0:25:0:        class=0x020000 card=0x309f17aa chip=0x153a8086 rev=0x04 hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'Ethernet Connection I217-LM'
>     class      = network
>     subclass   = ethernet
>     bar   [10] = type Memory, range 32, base 0xf7c00000, size 131072, enabled
>     bar   [14] = type Memory, range 32, base 0xf7c3d000, size 4096, enabled
>     bar   [18] = type I/O Port, range 32, base 0xf080, size 32, enabled
> 
> I did have the vboxnet driver loaded, but tried unloading that and still saw
> the issue. One thing I notice is some garbage at the top of the screen when the
> hang happens, perhaps there's a conflict with the vesa video. (This system is
> Haswell, using the vga/vesa driver.)
> 
> Any suggestions on how to debug?
> 
> Thanks,
> Steve
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> 

Try periodically setting dev.em.0.debug=1

it will dump a bunch of stats to syslog then set it self back to -1

there are also a bunch of useful stats under:
dev.em.0 including things like:
dev.em.0.mbuf_alloc_fail
dev.em.0.watchdog_timeouts
dev.em.0.mac_stats.collision_count

etc

that might provide some insight.

I have a box with 4x of the i210 (but that shows up as igb(4))

I have one of the i217LM nics in this machine, but it is used for video
production so it isn't running BSD at the moment.



-- 
Allan Jude

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