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On 8/15/06, Paul Weaver <iso@xxxxxxxxxxxx> wrote: > However top, (and snmp), report an insanely high cpu use in the "system" > catagory -- 99% on CPU1, 90% on CPU2 (and 10% for top). Probably not much help but on 2.4 kernels doesn't waiting IO show up as system usage but on 2.6 this as a wait IO section in top etc. Is the system waiting for disk IO and that is the problem? > > The "problem machine" is a vanilla 2.4.32 kernel, however the interupt > timer has been increased to 1024Hz when I compiled it (specific need for the > software). > The timer tick interrupt has caused flame wars before from what I have read, it appears that in many cases you can do without it by substituting any call for jiffies to read the RTC instead, apparently its a problem for large number of virtual machines as the timer ticks use up all the processing power!. Don' t think this is anything to do with your problem however but this might:- It also appears that process accounting under heavy load is inaccurate:- http://www-128.ibm.com/developerworks/linux/linux390/perf/tuning_rec_accounting.html might be related? Also ever tried 2.6.X on these systems with a totally different (and a few build options) for scheduling routines Regards -- Robin Cornelius http://www.byteme.org.uk -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html