igb driver RX (was TX) hangs when out of mbuf clusters

[Michael Tüxen]

On Feb 8, 2011, at 10:10 AM, Lev Serebryakov wrote:

> Hello, Karim.
> You wrote 8 февраля 2011 г., 6:29:53:
> 
>> Precisely, the exact same behavior happens (RX hang) if options
>> DEVICE_POLLING is _not_ used in the kernel configuration file. I tried with
>> POLLING since someone mentioned that it helped in a case mentioned earlier
>> today. Unfortunately for igb with or without polling yields the same rx ring
>> filing problem.
>  In my case (em(4), not igb(4) but symptoms are VERY similar) POLLING
> (both as kernel option AND "ifconfig em0 polling") options leads to
> resets (which drops all connections!) AFTER such kernel messages:
> 
> em0: Watchdog timeout -- resetting
> em0: Queue(0) tdh = 1302, hw tdt = 1265
> em0: TX(0) desc avail = 31,Next TX to Clean = 1296
Can you apply the attached patch and report what
the output for rx_nxt_refresh and rx_nxt_check is?

Best regards
Michael

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> 
> -- 
> // Black Lion AKA Lev Serebryakov <lev at serebryakov.spb.ru>
> 
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