On Tue, 2002-12-10 at 00:18, David Scriven wrote: > Chris Kloiber wrote: > > > I haven't seen a non-Xeon with HyperThreading > > enabled yet. In theory it should work just fine > > > as it's nearly identical to the P4 Xeon. > > Have you seen a Xeon with hyperthreading enabled? Yep, my workstation (Compaq W8000) has two P4 Xeon's at 2.4 Ghz each. > >From my reading it would seem that hyperthreading > is only supported in the 2.5.35 kernel and above Horse-pucky. Those kernels have some enhanced logic in them for HyperThreading, but I know Red Hat Linux 7.2 and up support it. (7.1 also with errata kernels) > (Maybe I've got that wrong, if so please let > me know). I thought that the Xeon used the SMP > kernel for multiprocessors while hyperthreading > requires SMT support. (I'm dangerously out of my > depth here folks - about to drown in acronyms!) Summit support? Only for NUMA architecture machines like the IBM x440. Just for giggles, here's the top of top. Naturally this box is not in production, it's here for testing and is currently idle. It has 8 physical processors and 16 Gigs of ram. 3:24am up 4 days, 12:20, 1 user, load average: 0.00, 0.00, 0.00 65 processes: 64 sleeping, 1 running, 0 zombie, 0 stopped CPU0 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU1 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU2 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU3 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU4 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU5 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU6 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU7 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU8 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU9 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU10 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU11 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU12 states: 0.0% user, 0.2% system, 0.0% nice, 99.3% idle CPU13 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU14 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle CPU15 states: 0.0% user, 0.0% system, 0.0% nice, 100.0% idle Mem:18547348K av, 1708772K used, 16838576K free, 208K shrd, 115448K buff Swap:2040212K av, 0K used, 2040212K free 1160684K cached > If I'm right and hyperthreading does require a > later kernel than the current 2.4.18 variant how > likely is it that Red Hat would introduce such a > kernel in the near future (ie. 6 months or so). Red Hat Advanced Server 2.1 (errata kernel 2.4.9-e.10 currently) includes a summit capable kernel now. More work is being done to make the summit patches work with non-summit machines, so it is in the works, no eta. -- Psyche-list mailing list Psyche-list@redhat.com https://listman.redhat.com/mailman/listinfo/psyche-list
