Date: Wed, 6 Aug 2003 10:05:17 -0700 From: David Schultz <das@freebsd.org> To: Jan Grant <Jan.Grant@bristol.ac.uk> Cc: Roderick van Domburg <r.s.a.vandomburg@student.utwente.nl> Subject: Re: Tuning HZ for semi-realtime applications Message-ID: <20030806170517.GA6961@HAL9000.homeunix.com> In-Reply-To: <Pine.GSO.4.44.0308061133330.15854-100000@mail.ilrt.bris.ac.uk> References: <20030806044351.GA3881@HAL9000.homeunix.com> <Pine.GSO.4.44.0308061133330.15854-100000@mail.ilrt.bris.ac.uk>
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On Wed, Aug 06, 2003, Jan Grant wrote: > On Tue, 5 Aug 2003, David Schultz wrote: > > > 100 Hz works just fine for > > interactive jobs; humans can't tell the difference.[1] > > They can if they're using X :-) I gave Denim* a trial recently; it was > unusable at 100Hz and fine at 1000. Yes, polling a tablet device is an interesting case where it matters. If you reread my last message carefully, you'll noticed that I suggested bumping up the default HZ a bit, since the overhead appears to be well into the noise even at 500 Hz. An alternative would be to implement a high-resolution timer facility similar to the Solaris cyclics implementation.
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