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Date: Sat, 7 Jun 2008 10:37:58 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Subject: FreeBSD 7 sched_ule
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what changed exactly. my observations shows that it make a good job NOT 
switching task too often, so many concurrent processes goes faster (less 
cache reloads), but for interactive X11 speed it's bad, it's difficult to 
point with mouse as it jumps

rtprio 31 <X org process> "fixes" that. but is there other fix?

with rtprio in case of Xorg getting in loop i wouldn't be able to do 
anything