On Tue, Sep 1, 2015 at 6:14 PM, Nuno Gonçalves <nuno...@gmail.com> wrote: > On Wed, Sep 2, 2015 at 2:03 AM, John Stultz <john.stu...@linaro.org> wrote: >> On Tue, Sep 1, 2015 at 5:36 PM, Nuno Gonçalves <nuno...@gmail.com> wrote: >>> On Tue, Sep 1, 2015 at 9:25 PM, Thomas Gleixner <t...@linutronix.de> wrote: >>>> On Tue, 1 Sep 2015, Nuno Gonçalves wrote: >>>> >>>>> There is a regression on the clock system since v3.16-rc5-111-g4396e05 >>>>> [1], >>>> >>>>> [1] >>>>> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4396e058c52e167729729cf64ea3dfa229637086 >>>> >>>> That commit has absolutely nothing to do with NTP. I fear your bisect >>>> went down the wrong road somewhere. >>> >>> You are right. It is v3.16-rc5-114-gdc49159: >>> >>> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dc491596f6394382fbc74ad331156207d619fa0a >>> >>> I've triple checked it this time. Not sure where I did the mistake to >>> get it wrong by 3 commits. >> >> This commit is much more believable (though surprising as that change >> was found to greatly improve results for most uses). >> >> Can you provide any more details about how the problem is reproduced >> (kernel config, what userland images are you using, etc)? I've got a >> BBB myself so I can try to see whats going on. >> >> thanks >> -john > > I'm using a clean Debian image: > > https://rcn-ee.com/rootfs/bb.org/testing/2015-08-31/console/bone-debian-8.1-console-armhf-2015-08-31-2gb.img.xz > > And just installing chrony from the feeds. With any kernel from 3.17 > you'll have wrong estimates at chronyc sourcestats.
Wrong estimates? Could you be more specific about what the failure you're seeing is here? The I installed the image above, which comes with a 4.1.6 kernel, and chrony seems to have gotten my BBB into ~1ms sync w/ servers over the internet fairly quickly (at least according to chronyc tracking). root@beaglebone:~# chronyc tracking Reference ID : 198.110.48.12 (time01.muskegonisd.org) Stratum : 3 Ref time (UTC) : Wed Sep 2 23:07:05 2015 System time : 0.001320852 seconds fast of NTP time Last offset : +0.001209910 seconds RMS offset : 0.002978454 seconds Frequency : 44.684 ppm fast Residual freq : +0.068 ppm Skew : 1.223 ppm Root delay : 0.073661 seconds Root dispersion : 0.021902 seconds Update interval : 518.3 seconds Leap status : Normal root@beaglebone:~# chronyc sourcestats 210 Number of sources = 4 Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev ============================================================================== 172.82.134.51 4 3 17m +1.593 30.515 +798us 802us unlawful.id.au 6 5 21m +1.080 2.312 +2731us 273us time.theplante.net 11 5 77m -0.536 0.915 -1165us 1044us time01.muskegonisd.org 4 3 25m +1.677 15.256 -342us 516us Can you send me your kernel config? thanks -john -- 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/
