Hello! On Thu, Feb 06, 2003 at 05:41:46PM +0100, Russell Coker wrote:
> > but there is possible situations that will not generate disk activity, > > but may cause your system to "go-slow", if there you have some > > unussual IO numbers while disk activity is moderate to low - > > most likely same sweet pair. > The problem is that sar etc product jumbled results. Profiling the kernel may > help, but may also hide the error, and it's not something I can easily do. Well, you can do it very easily. reboot with "profile=2" kernel option. when 100% sys cpu situation started - execute readprofile -r when it is finished, execute readprofile -m /path/to/System.map >somefile then sort somefile and you are done, you are now seeing where is most of the time is spent. > The servers are locked in a managed server room on the other side of the city > so seeing the blinken lights is not an option. ;) <humour>webcam</humour> > I've put the aa1 kernel on half the machines and now I'll wait to see what > happens. If the aa1 machines don't have the problem but the others do then > I'll go all aa1. Ah, if your problem was with highmem I/O not present, then that might actually help. Bye, Oleg