On Mon, 2015-07-13 at 10:54 +0530, Anshuman Khandual wrote: > On 07/10/2015 12:40 PM, Michael Neuling wrote: > > What's the performance impact of this? If you run this test with --fp, > > --altivec or --vector what is the impact of adding this patch? > > > > http://ozlabs.org/~anton/junkcode/context_switch2.c > > > > eg > > ./context_switch2 --fp 0 0 > > Please find the results here which looks similar with or without > the patch being applied.
No they don't look similar with or without. > (A) Floating point context switches (context_switch2 --fp 0 0) If you just sort them you see: 316478 after 316540 after 316650 after 318448 after 318904 before 320216 before 321206 before 321308 before 323460 after 324596 before It looks like ~1% degradation. Please run the test more times (maybe 1000) and see how the numbers look. cheers _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
