linux-kernel - Re: Performance Events hangs with Intel P4 system

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Date:	Fri, 14 May 2010 07:19:12 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Jaswinder Singh Rajput <jaswinderlinux@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Performance Events hangs with Intel P4 system

On Friday, May 14, 2010, Jaswinder Singh Rajput
<jaswinderlinux@...il.com> wrote:
> Hello,
>
> I am testing Performance Events on P4 with HT:
>
> [    0.002243] Performance Events: Netburst events, Netburst P4/Xeon PMU driver.
> [    0.002432] ... version:                0
> [    0.002545] ... bit width:              40
> [    0.002659] ... generic registers:      18
> [    0.002772] ... value mask:             000000ffffffffff
> [    0.002887] ... max period:             0000007fffffffff
> [    0.003004] ... fixed-purpose events:   0
> [    0.003118] ... event mask:             000000000003ffff
>
> dmesg : http://userweb.kernel.org/~jaswinder/P4_HT/dmesg-2634-rc7-tip.txt
> config : http://userweb.kernel.org/~jaswinder/P4_HT/config-2634-rc7-tip.txt
>
> [jaswinder@ht perf]$ ./perf stat -e cycles ls > /dev/null
>
>  Performance counter stats for 'ls':
>
>   <not counted>  cycles
>
>     0.003447053  seconds time elapsed
>
> [jaswinder@ht perf]$ ./perf stat -e cycles,instructions ls > /dev/null
>
>  Performance counter stats for 'ls':
>
>   <not counted>  cycles
>         1862188  instructions             #      0.000 IPC    (scaled
> from 54.91%)
>
>     0.003419230  seconds time elapsed
>
> [jaswinder@ht perf]$ ./perf stat -e
> cycles,instructions,cache-references ls > /dev/null
>
> <<this dumps on screen and hangs the systems>>
>
> How can I fix this problem.
>
> Thanks,
> --
> Jaswinder Singh.
>

thanks for testing. Is there any issue in dmesg for first two perf
calls before it hangs? And is there a chance for screen dump (photo or
netconsole)?
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