On Tuesday 05 September 2006 13:15, Maxim Sobolev wrote: > sobomax 2006-09-05 17:15:25 UTC > > FreeBSD src repository > > Modified files: > sys/i386/i386 local_apic.c > sys/amd64/amd64 local_apic.c > Log: > The FreeBSD by default "disables" hyper-threading cores, by not scheduling > any threads to them. However, it still counts those cores as "active but > permanently idle" when calculating system-wide CPUs statistics. It is > incorrect, since it skews statistics quite a bit and creates real problems > for certain types of applications (monitoring applications for example), > by making them believe that the system does have enough idle CPU resources, > while in fact it does not. > > Correct the problem by not calling performance counting routines on "disabled" > cores. The cleaner solution would be to just disable APIC timer interrupts on > those cores completely, but ENOTIME here and it is not clear if the > additional complexity really worth minor performance gain.
Is this going to break various places dividing stats by hw.ncpu (in userland) or mp_ncpus (in kernel)? (That is, are there any such places. If so, you just broke them.) -- John Baldwin _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/cvs-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"
