On Tue, 2003-06-10 at 13:19, Robert Jonsson wrote: > tisdagen den 10 juni 2003 22.16 skrev Andrew Burgess: > > >Hyperthreading - the new fancy P4's have it. Does it do anything on > > >linux? I saw some benchmarks where it really sped up video encoding (on > > >windows), how similar to sound processing is this? > > > > Alan Cox says HT provides 0-30% speedup. > > There was a recent thread on the Jack mailinglist where it seemed likely that > latency would suffer when HT was enabled, if I read the thread right... It > may had to do with using HT _and_ dual processors though, can't remember... The one I tested was a single processor P4 with HT enabled. With it enabled I see latency spikes (10-15mseg) and weird behavior of Jack as well. Steve (Harris) wrote something about threads not being happy on an HT processor. So I guess we'll have to wait till there is better kernel support (or maybe there is a kernel patch that fixes this?) -- Fernando
