On 03/07/13 23:24, David Ruggiero wrote: > I've been using OpenBsd for 8+ years on my main router/firewall (4 NICs). > Time to upgrade (I'm back on v3.8, yikes). Past time, really. So....lots to > learn / re-learn here. Have patience. First question: > > I'll be loading 5.2 on a low-power, Atom E640-based box (the Soekris > net6501). That chip has two Hyperthreading cores. Several net-references > (esp. calomel.org ) advocate turning off HTT in the bios when using OpenBSD > for faster interrupt servicing / task switching latency. > > But....perhaps that advice is pre-5.2, when we got pthreads(3) support? > What's the best current advice for that kind of one-cpu, > multi-logical-thread system? > > 1) Single processor kernel or multi-processor (smp) kernel? > 2) If the latter, HTT turned on or off?
it is extremely unlikely that you would ever notice the difference. This is like arguing about which motor oil gives you the best top-end speed of your car...while you are stuck commuting in bumper-to-bumper traffic. This is not the knob you need to turn. It seems to be a computer industry obsession about tuning the system for "optimal performance" when you aren't coming anywhere close to maxing anything out (hey, I've done it, often to pathetically comical results, myself). It is also absolutely trivial to test these things yourself... One BIOS setting, a choice in kernels. Nick.
