On 02/19/2014 03:17 AM, Yogi A. Patel wrote:
> On Feb 18, 2014, at 3:57 PM, Gilles Chanteperdrix
> <[email protected]> wrote:
>
>> On 02/18/2014 07:13 PM, Yogi A. Patel wrote:
>>> Sorry, answers below.
>>>
>>>> On Feb 18, 2014, at 10:57, Gilles Chanteperdrix
>>>> <[email protected]> wrote:
>>>>
>>>>> On 02/18/2014 04:39 PM, Yogi A. Patel wrote: Hi -
>>>>>
>>>>> I have patched Scientific Linux 6.5 (Linux kernel v
>>>>> 2.6.32.20) with
>>>>
>>>> 2.6.32 is very old.
>>>>
>>>>
>>>>> 1. I don't quite understand everything being printed out
>>>>> here, however I know that not having overruns is great - but
>>>>> I also know that the worst case latencies are not
>>>>> acceptable.
>>>>
>>>> In the example you show, the worst case latency is 11µs, is
>>>> this what you do not find acceptable? If this is indeed what
>>>> you find unacceptable, I am afraid there is little we can do.
>>>
>>> (RTXI.org)
>>
>> Website looks broken.
>
> I just checked - it is up and running. I would be interested in
> hearing your input about ours architecture and ways to make it
> better. (http://www.rtxi.org/about-rtxi/architecture/)
Indeed, I had a "script error", which is now gone.
>> Probably not. It will get clock_gettime(CLOCK_HOST_REALTIME)
>> working though, that was the initial question. That said, running
>> your kernel with a different configuration could help. For instance
>> turning off CONFIG_SMP, CONFIG_FTRACE, CONFIG_PREEMPT usually helps
>> reducing latency.
>
> OK, I recompiled and reran these tests and have latencies in the
> 10-11us range, still.
>
> Question - when it says “option is not set” in the config lie, does
> that by default mean that option is set to “n”? Or should I be
> setting options to “=n” instead?
Options have dependencies, which the configuration tool enforces, so,
editing the .config by hand is not recommended, you should use the
interactive tools instead (xconfig, or menuconfig for instance).
--
Gilles.
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