On Fri, 2008-01-25 at 18:03 +1100, Benjamin Herrenschmidt wrote: > On Fri, 2008-01-25 at 17:54 +1100, Benjamin Herrenschmidt wrote: > > > > Here, I do the test of running 4 times the repro-case provided by Michel > > with nice 19 and a dd eating CPU with nice 0. > > > > Without this option, I get the dd at 100% and the nice 19 shells down > > below it with whatever is left of the CPUs. > > > > With this option, dd gets about 50% of one CPU and the niced processes > > still get most of the time. > > FYI. This is a 4 way G5 (ppc64)
I also tested responsiveness of X running with or without that option and with niced CPU eaters in the background (still 4 of them, one per CPU), and I can confirm Michel observations, it gets very sluggish (maybe not -as- bad as his but still pretty annoying) with the fair group scheduler enabled. Here, X is running with nice=0 Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
