[ntp:questions] Time reset

Venu Gopal neo.venu at gmail.com
Tue Mar 18 10:01:31 UTC 2008


Hi Hal,

Can you post the Twiki URL after posting it.

Venu

Hal Murray wrote:
>> So its the DISK I/O thats causing loss of ticks ?
> 
> My first Red Hat system defaulted to no-DMA for IDE disks.  (Yes,
> that was a long time ago.)  With that setup, it was simple to generate
> lots of lost timer interrupts: just keep the disk busy doing reads.
> (Seeks don't count.  Read consecutive sectors.)
> 
> My problem went away when I turned on DMA.
> 
> I have a hack that I originally wrote for measuring disk
> transfer rates.  I'll dust it off and put it on the wiki
> if people think it will be helpful for discussions like this.
> 
> It compiles on Linux.  It should be easy to get it to work on
> other *nix systems.
> 




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