From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Don Zickus <dzickus@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>, George Spelvin <linux@horizon.com>,
Meelis Roos <mroos@linux.ee>, Lin Ming <ming.m.lin@intel.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
lkml <linux-kernel@vger.kernel.org>,
Jason Wessel <jason.wessel@windriver.com>
Subject: Re: [PATCH] perf, x86: P4 PMU -- Fix unflagged overflows test
Date: Mon, 07 Feb 2011 20:22:21 +0300 [thread overview]
Message-ID: <4D502A4D.1040301@gmail.com> (raw)
In-Reply-To: <4D4EF4BC.6040206@gmail.com>
On 02/06/2011 10:21 PM, Cyrill Gorcunov wrote:
> On 02/04/2011 07:59 PM, Don Zickus wrote:
>> On Fri, Feb 04, 2011 at 03:17:28PM +0300, Cyrill Gorcunov wrote:
>>> Please apply it, sorry for non-inlined patch (have a web access only at moment).
>>>
>>> Note that I've tested the patch on non-HT machine so if someone have HT'ed one
>>> -- it would be great to test the patch there.
>>
>> Hmm. For some reason, when I enable the kgdb testsuite, the box fails to
>> boot with hardlockup issues. It seems like the code is swallowing the
>> NMIs? I basically applied this patch on top of 2.6.38-rc3 and ran it on my
>> Xeon box (p4 w/HT).
>>
>> Cheers,
>> Don
>
> Don, I hope to get access to p4 machine tomorrow and investigate this issue
> (didn't manage to read kgdb code this weekend). Sorry for delay.
>
Just for info -- I've tested the patch on p4 machine with kgdb bootup tests
and results are somehow strange. If I disable nmi-watchdog the tests passes
fine and i'm able to run perf top (or anything related). Same time if I leave
nmi-watchdog enabled by default the borrowed event reported, kgdb tests passes
but nmi-watchdog never fires (ie I see nmi irq counter remains zero). So I've added
debug prints and found that counter reaches positive values and didn't issues
nmi at all. All in one -- i'm still investigating this issue unfortunatelly
the kernel build procedure sometime takes hours on this machine (even with
ccache enabled) so it goes a way slower then I expected :(
--
Cyrill
next prev parent reply other threads:[~2011-02-07 17:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-04 12:17 [PATCH] perf, x86: P4 PMU -- Fix unflagged overflows test Cyrill Gorcunov
2011-02-04 16:59 ` Don Zickus
2011-02-04 17:32 ` Cyrill Gorcunov
2011-02-06 19:21 ` Cyrill Gorcunov
2011-02-07 17:22 ` Cyrill Gorcunov [this message]
2011-02-08 14:26 ` George Spelvin
2011-02-08 14:38 ` Cyrill Gorcunov
2011-02-05 2:28 ` George Spelvin
2011-02-05 8:40 ` Cyrill Gorcunov
2011-02-05 9:15 ` George Spelvin
2011-02-05 9:22 ` Cyrill Gorcunov
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