On Fri, 1 Feb 2002, Luigi Rizzo wrote:
> HZ also has an impact on select() behaviour when timeouts are > used (and device drivers using timeouts as well). > A lot of software uses select() with a very short timeout which > is usually rounded up to the next tick. If the author of the software > is unaware of what goes on (likely) there might be negative effects > on performance because such programs stay idle longer than they should. > > cheers > luigi True, I had forgotten about that effect. Ironic, since I was quite annoyed by the limitations of 10ms accuracy last semester. Increasing the resolution of select/usleep is a good argument for increasing the HZ default, but I'm not sure how great the impact would be on slower machines. Mike "Silby" Silbersack To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
