Hi,
Now re-enable debugging, via:
echo 1 >/sys/kernel/perfmon/debug
echo 0 >/proc/sys/kernel/printk_ratelimit
capture the debug messages from /var/log/messages and send them to me.
If you've turned off threads, you should see half the number
of CPUs in /proc/cpcuinfo.
On Thu, Apr 9, 2009 at 4:31 PM, xudi <x...@ict.ac.cn> wrote:
> Hi Stephane,
>
> The server I am using is HP rx4640 with 4 Montecito processors.
> I re-compiled the kernel with newest perfmon-2.6.28, then I turned off
> hyper-threading using the ELILO shell with cmdline "cpuconfig threads off".
> But the PMC write error is still going on.
>
> I checked the old perfmon v2.0 with linux 2.6.9, all 12 PMCs can be accessed
> even I trun on hyper-threading.
>
> ps:
> I built the new kernel with flag
> CONFIG_PERFMON=y
> CONFIG_PERFMON_DEBUG=y
> CONFIG_IA64_PERFMON_COMPAT=y
> CONFIG_IA64_PERFMON_MONTECITO=m
>
> What else should I do?
>
>> stephane eranian
>> 2009-04-03 14:38:43
>> xudi
>> Re: [perfmon2] pfmon error on Montecito processor
>>Hi,
>>I looked at the kernel code again. I think you're hit by the erratum
>>121 work-around which consist
>>in disabling access to PMC10-PMC15 (6 upper counters) when
>>multithreading is on. If I recall
>>this erratum, there is an issue with leaking interrupts from one
>>thread to another. Even when counting,
>>you can generate interrupt if the counter overflow the 47 bits. If you
>>know you're not going to get into
>>this situation a perfmon flag can be set of the counter, however it
>>seems perfmon does not offer you
>>this option. So yes, you're are restricted to 6 counters unless you
>>turn off multithreading.
>
>
>>2009/4/3 <x...@ict.ac.cn>:
>> Hi eranian,
>>
>> I grabed the syslog of perfmon. Please find the attachment in this mail.
>>
>> The pfmon cmdline is still "pfmon -e
>> L3_READS_ALL_MISS:M:E:S:I,back_end_bubble_all,be_exe_bubble_all,l2d_references_reads,L3_READS_ALL_ALL:M:E:S:I,L3_READS_ALL_HIT:M:E:S:I,L2D_OZQ_CANCELS0_FILL_ST_CONF,l1dtlb_transfer,l2dtlb_misses,dtlb_inserts_hpw,er_mem_read_out_hi,er_mem_read_out_lo
>> ls"
>>
>> Regards,
>> Scott
>>
>>> 2009/4/2 <x...@ict.ac.cn>:
>>>> I'm sorry, there's no /var/log/syslog on my system(redhat)
>>>> I find that /var/log/messages in the only changed file after I ran the
>>>> pfmon cmdline, and there is only one message related:
>>>>
>>> Did you compile perfmon 2.81 yourself?
>>> If so, make sure you enabled CONFIG_PERFMON_DEBUG.
>>> Otherwise you don't get any debug messages.
>>>
>>>> Apr 聽2 23:04:43 xiaoqiang kernel: perfmon: perfmon: Errata 121
>>>> PMD10/PMD15
>>>> cannot be used to overflowwhen threads on on
>>>>
>>>> May be I will resolve the syslog problem first?
>>>>
>>>>
>>>>> 2009/4/2 聽<x...@ict.ac.cn>:
>>>>>> If I did the correct thing that you mean,
>>>>>> no output for "pfmon/tests/pfdbg --on --printk"
>>>>>> and the result of pfmon cmdline not change
>>>>>>
>>>>> Yes, that's normal, it just enabled kernel level debugging output.
>>>>> grab what you have about perfmon in /var/log/syslog.
>>>>>
>>>>>>
>>>>>>> 2009/4/2 鑱?lt;x...@ict.ac.cn>:
>>>>>>>>
>>>>>>>> Yes. for example:
>>>>>>>> pfmon -e
>>>>>>>> L3_READS_ALL_MISS:M:E:S:I,back_end_bubble_all,be_exe_bubble_all,l2d_references_reads,L3_READS_ALL_ALL:M:E:S:I,L3_READS_ALL_HIT:M:E:S:I,L2D_OZQ_CANCELS0_FILL_ST_CONF,l1dtlb_transfer,l2dtlb_misses,dtlb_inserts_hpw,er_mem_read_out_hi,er_mem_read_out_lo
>>>>>>>> ls
>>>>>>>
>>>>>>> Works for me on my system.
>>>>>>> You need to enable perfmon debugging and send me the output.
>>>>>>> in the pfmon package, do:
>>>>>>> 鑱?鑱?pfmon/tests/pfdbg --on --printk
>>>>>>>
>>>>>>> run test, grab syslog output.
>>>>>>>
>>>>>>>>
>>>>>>>> That's 12 events and I get "cannot write PMCs: Invalid argument"
>>>>>>>> Then delete any 6 events on the event list, i.e. remain 6 events,
>>>>>>>> all
>>>>>>>> will
>>>>>>>> be ok on my system.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> On Thu, Apr 2, 2009 at 3:29 PM, 閼?lt;x...@ict.ac.cn> wrote:
>>>>>>>>>> Hi all:
>>>>>>>>>>
>>>>>>>>>> Now I'm using a dual-core Itanium2 processor with perfmon kernel
>>>>>>>>>> 2.81,
>>>>>>>>>> pfmlib and pfmon V3.7.
>>>>>>>>>> I have used pfmon3.2 with kernel 2.0 for long time. I updated the
>>>>>>>>>> perfmon
>>>>>>>>>> kernel to 2.81 recently and now I get problems. When I count for
>>>>>>>>>> more
>>>>>>>>>> than
>>>>>>>>>> 6 events with pfmon, I get the error message "cannot write PMCs:
>>>>>>>>>> Invalid
>>>>>>>>>> argument". If the number of events is less than or equal to 6,
>>>>>>>>>> pfmon
>>>>>>>>>> works
>>>>>>>>>> well.
>>>>>>>>>
>>>>>>>>> You need to provide the exact pfmon cmdline so I can try and
>>>>>>>>> reproduce
>>>>>>>>> the
>>>>>>>>> problem.
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> I also get the dmessage as "perfmon: perfmon: Errata 121
>>>>>>>>>> PMD10/PMD15
>>>>>>>>>> cannot be used to overflowwhen threads on on" when that error
>>>>>>>>>> occurs.
>>>>>>>>>>
>>>>>>>>> That is normal. There is indeed a processor bug.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> Note that Montecito processor has 12 PMUs.
>>>>>>>>>>
>>>>>>>>> Yes, but there are restrictions on some events.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>
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