linux-kernel - Re: [PATCHv3 00/19] perf tools: Factor ordered samples queue

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Date:	Mon, 21 Jul 2014 21:44:20 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	David Ahern <dsahern@...il.com>, Andi Kleen <andi@...stfloor.org>
CC:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Jean Pihet <jean.pihet@...aro.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCHv3 00/19] perf tools: Factor ordered samples queue

On 21/07/2014 9:36 p.m., David Ahern wrote:
> On 7/21/14, 12:23 PM, Adrian Hunter wrote:
>> On 21/07/2014 7:31 p.m., Andi Kleen wrote:
>>> Jiri Olsa <jolsa@...hat.com> writes:
>>>>
>>>> [jolsa@...-x3650m4-01 perf]$ sudo ./perf report --stdio
>>>> Timestamp below last timeslice flush
>>>> 0x2276f58 [0x68]: failed to process type: 9
>>>
>>> FWIW we're seeing this frequently too.
>>
>> Jiri's example didn't work for me.  Do you have one?
>
> $ perf sched record  -m 8192 -- perf bench sched all
> # Running sched/messaging benchmark...
> # 20 sender and receiver processes per group
> # 10 groups == 400 processes run
>
>       Total time: 0.087 [sec]
>
> # Running sched/pipe benchmark...
> # Executed 1000000 pipe operations between two processes
>
>       Total time: 12.043 [sec]
>
>        12.043779 usecs/op
>            83030 ops/sec
>
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 289.549 MB perf.data (~12650569 samples) ]
> 0x54b4828 [0]: failed to process type: 0
>
> No overload condition, no dropped chunks message - yet can't process events.

Actually, it was the "Timestamp below last timeslice flush"
that I was interested in.
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