On 11/19/2010 02:38 PM, Jim wrote:
Sorry, but that's just your perception. This fix only affects TTYs (i.e. terminal sessions). For instance, if you're watching a video and compiling something in a terminal, this fix will make sure that the terminal as a whole (no matter how many background processes it starts) shares time fairly with your video player. In other words, if you don't have a single terminal open, you shouldn't see any change at all. In more detail, the specific problem is this: * Kernel sees 10 CPU-hungry tasks: 1,2,3,4,5,6,7,8,9,10. Since the kernel doesn't know any better, it considers them equals and gives them same CPU time share (10%) * In reality, process (1) is code compiling, (2)..(9) are started by (1) automagically, and (10) is a youtube video you're watching (because http://xkcd.com/303/). (10) requires at least 50% CPU time or it'll be jittery. * The solution, then, is to treat the *group* (1)..(9) as an equal to (10), and divide the time accordingly: (10) gets 50%, while (1)..(9) get 50/9 ~= 5.6% HTH |
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