On 04/24/2014 07:04 PM, John Stultz wrote: > Continuing the sporadic work on improving the timekeeping > frequency steering logic when NOHZ is enabled, I've made a number > of changes to my re-implementation of Miroslav's patch (most > recently posted here: https://lkml.org/lkml/2014/2/12/401 ), > and I'm getting much closer results in the simulator. > > Compared with Miroslav's patch, this avoids doing any extra > divisions, and instead approximates the correction > logarithmically. In addition to trying to lower overhead, this > allows the other accounting bits to be managed in much the > same way we have been doing for awhile. > > This patch set contains one portion from Miroslav's patch > (ntp_tick caching) split out into a separate logical patch. > > Below are some of the simulator results (BTW Miroslav, w/ 3.15-rc, > you'll need to revert b399fe355b30d01 to get the simulator building) > comparing this patchset to Miroslav's patch to show we're getting in > the right order of magnitude. >
John, I'm going to put this into a weekend long test right away (along with another unrelated cpupower patch). I'll ping back Monday to let you know how it went. P. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/