malc wrote: > On Fri, 15 Jun 2007, Balbir Singh wrote: > >> malc wrote: >>> On Thu, 14 Jun 2007, Ingo Molnar wrote: >>> > > [..snip..] > >>> >>> Now integral load matches the one obtained via the "accurate" method. >>> However the report for individual cores are of by around 20% percent. >>> >> >> I think I missed some of the context, is the accounting of individual >> tasks >> or cpustat values off by 20%? I'll try and reproduce this problem. > > Neither actually, the individual core idle times reported via `/proc/stat' > are off by 20 percent, one over estimates and the other under estimates > and the sum is right on the mark. >
Interesting, the idle time accounting (done from account_system_time()) has not changed. Has your .config changed? Could you please send it across. I've downloaded apc and I am trying to reproduce your problem. >> >> Could you provide more details on the APC tool that you are using -- I >> do not understand the orange and yellow lines, do they represent system >> and user time? > > It's somewhat documented on the page: http://www.boblycat.org/~malc/apc > Anyway the left bar is based on information from `/proc/stat' the right > one is derived from the kernel module that just times how much time was > spent in idle handler. The graphs: red - `/proc/stat', yellow - module. > >> NOTE: There is some inconsistency in the values reported by /usr/bin/time >> (getrusage) and values reported in /proc or through delay accounting. > > I don't really use `getrusage'. > Tools like /usr/bin/time do. -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
