Messages in this thread | | | Date | Wed, 18 Oct 2006 18:44:59 +0200 | From | Udo van den Heuvel <> | Subject | Re: 2.6.18 w/ GPS time source: worse performance |
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Lee Revell wrote: > On Wed, 2006-10-18 at 17:20 +0200, Udo van den Heuvel wrote: >> Lee Revell wrote: >>> On Tue, 2006-10-17 at 17:25 +0200, Udo van den Heuvel wrote: >>>> Why does a GPS as time source (with ntpd) perform so much worse with 2.6.18? >>> Um... you don't give nearly enough information to even begin to know >>> what you're talking about. >> No one here with a vague idea about the cause for the bad performance? >> I am sure I not the only one experiencing this. > > No, the issue is that a one-sentence bug report is not helpful. You > don't give enough information to debug it. Kernel config, steps to > reproduce, etc, etc. > > Please look at LKML archives for some examples of the type of bug report > that does get a response.
Get the latest kernel. Compile for your system Get ntpd. Configure for your PPS/NMEA source. Run ntpd. Watch performance. Repeat watching of performance.
It is not a crash. Not an oops. It is stuff that is visible by watching ntpq -pn output, by letting mrtg graph stuff, etc. Watch the offset and jitter collumns. Check /usr/sbin/ntpdc -c kerninfo output. Graph that stuff. Over the monhts you see changes. Some of them you can explain. Some you can't.
I can understand this is not you everyday bug but this *is* an issue.
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