On Mon, 2009-12-07 at 09:44 -0700, Greg Woods wrote: > On Mon, 2009-12-07 at 16:18 +0100, Joerg Bergmann wrote: > > > > > The problem of the Pentium 4 D: It is not really a dual core one. > > Hyper-Threading means: There is one core with two execution paths, which > > means some of the common CPU features, but not all, are present twice. > > One feature in particular that is not present twice is some of the > caching. This is sort of why they named it "hyperthreading". If you can > get multiple threads of the same process, sharing the same memory, to > run simultaneously, there is a performance boost. But if you try to run > two completely different processes simultaneously, there will actually > be a performance LOSS because of all the cache misses this will cause. > > --Greg > > As far as I can tell both cores have their separate 1M cache. But lshw-gui reports HT is supported but looking at the files in /sys makes me doubt it. For example: /sys/devices/system/node/node0/cpu1/online does not exist. But that may be because the BIOS has turned HT off. -- ======================================================================= A complex system that works is invariably found to have evolved from a simple system that works. ======================================================================= Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam@xxxxxxxxxxxxx -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
