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SubjectRe: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-12
Ingo Molnar wrote:
> * Steven Rostedt <rostedt@goodmis.org> wrote:
>
>
>>Second, my ethernet doesn't work, and it really seems to be some kind
>>of interrupt trouble. It sends out ARPs but doesn't see them come
>>back, and it also doesn't seem to know that it sent them out. I get
>>the following:
>>
>>NETDEV WATCHDOG: eth0: transmit timed out
>>eth0: transmit timed out, tx_status 00 status e601.
>> diagnostics: net 0ccc media 8880 dma 0000003a fifo 0000
>>eth0: Interrupt posted but not delivered -- IRQ blocked by another
>>device?
>> Flags; bus-master 1, dirty 33(1) current 33(1)
>> Transmit list 00000000 vs. f75012a0.
>> 0: @f7501200 length 80000043 status 8c010043
>> 1: @f75012a0 length 8000007a status 0c01007a
>> 2: @f7501340 length 8000002a status 0001002a
>> 3: @f75013e0 length 80000098 status 0c010098
>> 4: @f7501480 length 8000002a status 0001002a
>> 5: @f7501520 length 8000002a status 0001002a
>> 6: @f75015c0 length 8000002a status 0001002a
>> 7: @f7501660 length 8000002a status 0001002a
>> 8: @f7501700 length 80000043 status 0c010043
>> 9: @f75017a0 length 80000043 status 0c010043
>> 10: @f7501840 length 8000004f status 0c01004f
>> 11: @f75018e0 length 8000004f status 0c01004f
>> 12: @f7501980 length 80000043 status 0c010043
>> 13: @f7501a20 length 8000007a status 0c01007a
>> 14: @f7501ac0 length 80000098 status 0c010098
>> 15: @f7501b60 length 8000002a status 8001002a
>>
>>I have a (from lspci)
>>0000:02:08.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M
>>[Tornado] (rev 78)
>>
>>
>>I can look into this further to see what the problem is. One funny
>>note, on the vanilla kernel, my eth0 is at interrupt 177, but on the
>>rt patched kernel its swapped with the sound card and is at interrupt
>>169. Well it's getting too late for me now (its 1am my time (01:00 for
>>you European folks ;-) , and I need to get up at 6:30 am). Tomorrow,
>>I'll hack on it some more.
>
>
> yeah, please check this - you are the first one to report this issue.
>
> A good first step would be to go switch to a non-PREEMPT_RT preemption
> model (but to keep the -RT codebase) and see whether the breakage is
> related to that. If the breakage goes away with say PREEMPT_DESKTOP then
> i'd suggest to enable PREEMPT_HARDIRQS and PREEMPT_SOFTIRQS (but keep
> PREEMPT_DESKTOP) - do these alone trigger the breakage? E.g. there was
> an obscure timing bug in the floppy driver that only triggered with
> PREEMPT_HARDIRQS enabled. So it's not out of question that there's some
> other driver bug/race in hiding. The other possibility is some generic
> -RT kernel breakage - like the SLAB issue was.
>
> Ingo
>

I actually have this same card in the system I am sending this from
currently running 2.6.10-rc2-mm3-V0.7.32-12 #15 SMP.

kr
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