Date: Sun, 16 Sep 2007 22:19:08 +0200 (MEST) From: Michiel Boland <michiel@boland.org> To: freebsd-current@freebsd.org Subject: PREEMPTION on UP systems Message-ID: <Pine.GSO.4.64.0709162213140.4156@neerbosch.nijmegen.internl.net>
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-CURRENT UP systems with options PREEMPTION exhibit some very 'jerky' and annoying behaviour. In particular, if you have, say, a buildkernel running somewhere, interactive behaviour in all alther applications goes down the toilet. You can very easily reproduce this by opening some file and vi and just moving the cursor back and forth (press and hold 'l' and 'h'). You will see the cursors miss beats and genereally just behave very jumpy. It appears to be disk-io related. Sorry I can't be more specific. It's just that someone else also mentioned something about strange perormance issues on UP boxen. So my suggestion would be to take out the PREEMPTION option and see how that goes. (Obviously, you can't have SCHED_ULE then also.) Cheers Michiel
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