[time-nuts] NTP jitter with Linux

Randall Prentice randall.prentice at pscconsulting.com
Wed Apr 4 23:02:29 UTC 2012


The INTEL HRET (High Resolution blagh Timer) seemed to work whereas the AMD equivalent didn't seem to fix the problem.  
Note: this was older AMD ATHLON processors,  they may have fixed this by now.

Regards
Randall
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of gary
Sent: Thursday, 5 April 2012 10:58 a.m.
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] NTP jitter with Linux

That is the AMD speed step, but doesn't intel do the same thing?

Incidentally, there are hacks for linux to make it more real time, i.e. 
lower latency. I never messed with them, but you find this mentioned related to multimedia oriented distributions.


On 4/4/2012 3:53 PM, Randall Prentice wrote:
> I found that the AMD processors change CPU frequency with load and this seemed to upset any NTP calculations.
>
> In the end I went to Intel CPU  (Mutter mutter).
>
> Regards
> Randall

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