From: Jan Kiszka <jan.kiszka@domain.hid>
To: xenomai-core <xenomai@xenomai.org>
Cc: xenomai@xenomai.org, Rudolf Marek <rudolf.marek@domain.hid>
Subject: [Xenomai-core] Re: [Xenomai-help] negative values of latency/klatency
Date: Tue, 28 Feb 2006 15:13:01 +0100 [thread overview]
Message-ID: <44045A6D.7000508@domain.hid> (raw)
In-Reply-To: <440442FC.8090100@domain.hid>
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Jan Kiszka wrote:
> Rudolf Marek wrote:
>> ...
>> RTT| 00:00:01
>> RTH|----klat min|----klat avg|----klat max| overrun|---klat best|--klat worst
>> RTD| 4767| 4929| 15191| 0| 4767| 15191
>> RTD| 4767| 4808| 8282| 0| 4767| 15191
>> RTD| 4767| 4808| 8080| 0| 4767| 15191
>> RTD| 4808| 4808| 7838| 0| 4767| 15191
>> RTD| 4767| 4808| 7272| 0| 4767| 15191
>> RTT| 00:00:06
>> RTH|----klat min|----klat avg|----klat max| overrun|---klat best|--klat worst
>> RTD| 4808| 4808| 7555| 0| 4767| 15191
>> RTD| 4767| 4808| 7959| 0| 4767| 15191
>> RTD| 4767| 4808| 7393| 0| 4767| 15191
>> RTD| 4808| 4808| 7191| 0| 4767| 15191
>> RTD| 4767| 4808| 7313| 0| 4767| 15191
>>
>> Is this a bug or feature please? Can someone throw the light?
>> Good would be to print the units to the numbers too (ns).
>>
>
> That was likely a layout question of the latency tool's output. We could
> simply dump something like "All latencies in nanoseconds" during
> start-up. Would this be more helpful?
>
The output of latency is indeed inconsistent. Histogram and stats are
printed in microseconds, intermediate and overall latencies go out as
nanoseconds. Anyone any objections to switch to micros with 3 digits
after the decimal point? Patch is ready to be applied.
== Sampling period: 150 us
== Test mode: in-kernel timer handler
== All results in microseconds
warming up...
RTT| 00:00:01 (in-kernel timer handler, 150 us period)
RTH|-----lat min|-----lat avg|-----lat max|-overrun|----lat best|---lat
worst
RTD| 8.935| 13.824| 39.951| 0| 8.935|
39.951
RTD| 8.998| 14.619| 36.867| 0| 8.935|
39.951
RTD| 8.576| 14.604| 37.417| 0| 8.576|
39.951
RTD| 3.018| 14.623| 40.466| 0| 3.018|
40.466
[grabbed on a low-end board]
Jan
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next prev parent reply other threads:[~2006-02-28 14:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-27 16:12 [Xenomai-help] negative values of latency/klatency Rudolf Marek
2006-02-28 12:33 ` Jan Kiszka
2006-02-28 12:52 ` Philippe Gerum
2006-02-28 13:02 ` Philippe Gerum
2006-02-28 14:13 ` Jan Kiszka [this message]
2006-02-28 15:22 ` [Xenomai-core] " Philippe Gerum
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