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List:       linux-rt-users
Subject:    Re: Calculating latency using high resolution timer
From:       "Sarin, Suseelan" <suseelan () gmail ! com>
Date:       2010-06-10 6:25:54
Message-ID: AANLkTikQ5Arhc-msaILLa1oFPbTHbg7yXxSKp3F-T7cM () mail ! gmail ! com
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>> this. My doubt is, if the system is loaded to the extend that an RT
>> task can have considerable latency, can I trust the time read from the
>> high resolution timer of the system?
>
> Yes, it's accurate. cyclictest relies on that as well.
>
>> Also, with these measurements, I am seeing a ~5msec latency. Is there
>> a way I can exactly point out the reason for this latency?
>
> Tracing. See cyclictest.c for how that's done.

Thank you. I will check the cyclic test code and get back.
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