[ntp:questions] Re: aix more reliable for ntp than linux (intel) ?

Ulrich Windl Ulrich.Windl at RZ.Uni-Regensburg.DE
Fri Aug 22 11:35:54 UTC 2003


Does hdparm say your IDE CD drive is using DMA or is it using PIO? I
guess AIX may serve better hardware, and that's why its performing
better.

Regards,
Ulrich

ptrojane at mion.elka.pw.edu.pl (Piotr Trojanek) writes:

> In article <b98kr2$gnh2o$1 at ID-172084.news.dfncis.de>, Tom Van Overbeke wrote:
> >May  6 17:27:45 dobermann2 ntpd[1910]: time reset 0.718200 s
> >May  6 17:27:45 dobermann2 ntpd[1910]: synchronisation lost
> >
> >Surely this is not normal ?
> 
> it should not happend... but I see something really worse, while burning
> CD on linux (on IDE, with SCSI emulation). when I do:
> while sleep 4; do ntpdate -q ntp.server.my.org; done
> I see, that clock is getting behind about 1sec every few seconds!
> 
> this probably means, that there is something REALLY wrong with ide-scsi
> emulation drivers (it can be only blocking interrupts for so long,
> that timer interrupts are lost), so why there can't be something similar,
> with other (ie. SCSI in general) drivers?
> 
> this problem can be tracked using bare linux kernel with tiny ramdisk
> with only ntpd on it, but ... we don't buy P4/2.4GHz for tests like this:) 
> 
> -- 
> Piotr Trojanek



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