> Better than 100Hz is possible and still precise. Something around > 1000Hz is necessary for human interaction.
That doesn't sound right. I've had good HCI experiences with HZ=100. Why do you see a higher HZ as necessary for human interaction? > Modern hardware could easily do 100kHz. Not with curren^Wat least one moderately recent NetBSD version! At work, I had occasion to run 9.1/amd64 with HZ=8000. This was to get 8-bit data pushed out a parallel port at 8kHz; I added special-case hooks between the relevant driver and the clock (I forget whether softclock or hardclock). It worked for its intended use fairly nicely...but when I tried one of my SIGALRM testers on it, instead of the 100Hz it asked for, I got signals at, IIRC, about 77Hz. I never investigated. I think I still have access to the work machine in question if anyone wants me to try any other quick tests, but trying to figure out an issue on a version I don't use except at work is something I am unmotivated to do on my own time, and using work time to dig after an issue that doesn't affect work's use case isn't an appropriate use of work resources. /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mo...@rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B