On Tue, Jun 03, 2003 at 06:58:03 -0700, Fernando Pablo Lopez-Lezcano wrote: > > > The problem is not speed but latency glitches. It certainly should be > > > slower than a "real" dual cpu system but it could be slightly faster > > > than the same uniprocessor machine with ht turned off. Of course if you > > > have latency problems it is not very useful. > > > > I think its a better win if the kernel understands HT, > > I thought it did, obviously it does not (completely).
Some do, some dont. I'm not sure where the cutoff comes or if its a patch. > > I have a smp ht > > machine and big parallel therads sometime get stuck on different threads of > > the same cpu, instead of different cpus. If I had no HT in those cases it > > would be faster. > > Ha! So I was not imagining things. I had some weird problems when trying > to run jack (but I was distracted with the latency issues so I did not > pay much attention - one problem at a time) so most probably that is the > reason. I dont knwo what (linux) thread affinity is like, it could be that if oyu restart jack it will get its threads stuck to real cpus. If your on a UP system it doesn't matter ofcourse, its only a problem where you have an SMP system and all the virtual CPUs are not equal. - Steve