Re: /proc or ps tools bug? 2.6.3, time is off

[David Ford]

powerix root # grep cpu /proc/stat; cat /proc/uptime
cpu  403880 466666 580559 15017904 475868 10864 3030
cpu0 403880 466666 580559 15017904 475868 10864 3030
186882.63 154999.74

(gdb) p 403880 +466666 +580559 +15017904 +475868 +10864 +3030
$1 = 16958771

(gdb) p 16958771/186882.63
$2 = 90.745571164104447

Hmm, not quite 100.0

david

Petri Kaukasoina wrote:

> Hi,
>
> I reported the same problem some time ago. Could you type
>
> grep cpu /proc/stat; cat /proc/uptime
>
> for example, I get
>
> cpu  140708 1489 43735 21209021 292168 4879 4192
> cpu0 140708 1489 43735 21209021 292168 4879 4192
> 216925.15 215037.34
>
> Then add jiffies and divide by uptime:
>
> (140708+1489+43735+21209021+292168+4879+4192)/216925.15 = 100.01695
>
> which is not 100 here as it should be. (On kernel 2.2.* I have it exactly
> 100). ps uses Hertz=100 but it should be 170 ppm larger which makes an error
> of about 15 seconds a day. (Running without ntpd doesn't fix it.)
>  
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