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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