Date: Wed, 8 May 2013 19:54:14 +1000 From: Peter Jeremy <peter@rulingia.com> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-arm@freebsd.org Subject: Re: Sawtooth ping RTT on RPi Message-ID: <20130508095414.GB90732@server.rulingia.com> In-Reply-To: <CAJ-VmomK15L_Cx=pQDFv-pRu3SfT4aRXzsYX_Rp_si8NofMZ-Q@mail.gmail.com> References: <20130508085901.GA90732@server.rulingia.com> <CAJ-VmomK15L_Cx=pQDFv-pRu3SfT4aRXzsYX_Rp_si8NofMZ-Q@mail.gmail.com>
index | next in thread | previous in thread | raw e-mail
[-- Attachment #1 --] On 2013-May-08 02:35:06 -0700, Adrian Chadd <adrian@freebsd.org> wrote: >On 8 May 2013 01:59, Peter Jeremy <peter@rulingia.com> wrote: >> I've noticed a sawtooth-shaped cyclic pattern in ping RTTs to my RPi >> (running r249590M): ... >CAn you run that for a minute or two, just to capture a few cycles? Apart from the outliers at 0 and 23, the following is a regular sawtooth for 2 mins. PING rpi1.rulingia.com (192.168.123.231): 56 data bytes 64 bytes from 192.168.123.231: icmp_seq=0 ttl=64 time=19.996 ms 64 bytes from 192.168.123.231: icmp_seq=1 ttl=64 time=10.306 ms 64 bytes from 192.168.123.231: icmp_seq=2 ttl=64 time=9.342 ms 64 bytes from 192.168.123.231: icmp_seq=3 ttl=64 time=8.361 ms 64 bytes from 192.168.123.231: icmp_seq=4 ttl=64 time=7.365 ms 64 bytes from 192.168.123.231: icmp_seq=5 ttl=64 time=6.491 ms 64 bytes from 192.168.123.231: icmp_seq=6 ttl=64 time=5.477 ms 64 bytes from 192.168.123.231: icmp_seq=7 ttl=64 time=4.507 ms 64 bytes from 192.168.123.231: icmp_seq=8 ttl=64 time=3.590 ms 64 bytes from 192.168.123.231: icmp_seq=9 ttl=64 time=2.537 ms 64 bytes from 192.168.123.231: icmp_seq=10 ttl=64 time=1.627 ms 64 bytes from 192.168.123.231: icmp_seq=11 ttl=64 time=10.738 ms 64 bytes from 192.168.123.231: icmp_seq=12 ttl=64 time=9.709 ms 64 bytes from 192.168.123.231: icmp_seq=13 ttl=64 time=8.708 ms 64 bytes from 192.168.123.231: icmp_seq=14 ttl=64 time=7.790 ms 64 bytes from 192.168.123.231: icmp_seq=15 ttl=64 time=6.832 ms 64 bytes from 192.168.123.231: icmp_seq=16 ttl=64 time=5.853 ms 64 bytes from 192.168.123.231: icmp_seq=17 ttl=64 time=4.928 ms 64 bytes from 192.168.123.231: icmp_seq=18 ttl=64 time=2.948 ms 64 bytes from 192.168.123.231: icmp_seq=19 ttl=64 time=2.027 ms 64 bytes from 192.168.123.231: icmp_seq=20 ttl=64 time=1.015 ms 64 bytes from 192.168.123.231: icmp_seq=21 ttl=64 time=10.042 ms 64 bytes from 192.168.123.231: icmp_seq=22 ttl=64 time=9.156 ms 64 bytes from 192.168.123.231: icmp_seq=23 ttl=64 time=18.039 ms 64 bytes from 192.168.123.231: icmp_seq=24 ttl=64 time=7.217 ms 64 bytes from 192.168.123.231: icmp_seq=25 ttl=64 time=6.196 ms 64 bytes from 192.168.123.231: icmp_seq=26 ttl=64 time=5.287 ms 64 bytes from 192.168.123.231: icmp_seq=27 ttl=64 time=4.321 ms 64 bytes from 192.168.123.231: icmp_seq=28 ttl=64 time=3.350 ms 64 bytes from 192.168.123.231: icmp_seq=29 ttl=64 time=2.440 ms 64 bytes from 192.168.123.231: icmp_seq=30 ttl=64 time=1.385 ms 64 bytes from 192.168.123.231: icmp_seq=31 ttl=64 time=10.386 ms 64 bytes from 192.168.123.231: icmp_seq=32 ttl=64 time=9.469 ms 64 bytes from 192.168.123.231: icmp_seq=33 ttl=64 time=8.527 ms 64 bytes from 192.168.123.231: icmp_seq=34 ttl=64 time=7.161 ms 64 bytes from 192.168.123.231: icmp_seq=35 ttl=64 time=6.565 ms 64 bytes from 192.168.123.231: icmp_seq=36 ttl=64 time=5.629 ms 64 bytes from 192.168.123.231: icmp_seq=37 ttl=64 time=4.205 ms 64 bytes from 192.168.123.231: icmp_seq=38 ttl=64 time=3.697 ms 64 bytes from 192.168.123.231: icmp_seq=39 ttl=64 time=2.720 ms 64 bytes from 192.168.123.231: icmp_seq=40 ttl=64 time=1.748 ms 64 bytes from 192.168.123.231: icmp_seq=41 ttl=64 time=0.851 ms 64 bytes from 192.168.123.231: icmp_seq=42 ttl=64 time=9.869 ms 64 bytes from 192.168.123.231: icmp_seq=43 ttl=64 time=8.913 ms 64 bytes from 192.168.123.231: icmp_seq=44 ttl=64 time=6.915 ms 64 bytes from 192.168.123.231: icmp_seq=45 ttl=64 time=4.986 ms 64 bytes from 192.168.123.231: icmp_seq=46 ttl=64 time=4.045 ms 64 bytes from 192.168.123.231: icmp_seq=47 ttl=64 time=3.069 ms 64 bytes from 192.168.123.231: icmp_seq=48 ttl=64 time=2.137 ms 64 bytes from 192.168.123.231: icmp_seq=49 ttl=64 time=1.168 ms 64 bytes from 192.168.123.231: icmp_seq=50 ttl=64 time=10.172 ms 64 bytes from 192.168.123.231: icmp_seq=51 ttl=64 time=9.254 ms 64 bytes from 192.168.123.231: icmp_seq=52 ttl=64 time=8.272 ms 64 bytes from 192.168.123.231: icmp_seq=53 ttl=64 time=7.328 ms 64 bytes from 192.168.123.231: icmp_seq=54 ttl=64 time=6.375 ms 64 bytes from 192.168.123.231: icmp_seq=55 ttl=64 time=5.390 ms 64 bytes from 192.168.123.231: icmp_seq=56 ttl=64 time=4.037 ms 64 bytes from 192.168.123.231: icmp_seq=57 ttl=64 time=3.425 ms 64 bytes from 192.168.123.231: icmp_seq=58 ttl=64 time=2.435 ms 64 bytes from 192.168.123.231: icmp_seq=59 ttl=64 time=1.542 ms 64 bytes from 192.168.123.231: icmp_seq=60 ttl=64 time=10.591 ms 64 bytes from 192.168.123.231: icmp_seq=61 ttl=64 time=9.581 ms 64 bytes from 192.168.123.231: icmp_seq=62 ttl=64 time=8.686 ms 64 bytes from 192.168.123.231: icmp_seq=63 ttl=64 time=7.721 ms 64 bytes from 192.168.123.231: icmp_seq=64 ttl=64 time=6.804 ms 64 bytes from 192.168.123.231: icmp_seq=65 ttl=64 time=5.764 ms 64 bytes from 192.168.123.231: icmp_seq=66 ttl=64 time=4.777 ms 64 bytes from 192.168.123.231: icmp_seq=67 ttl=64 time=3.857 ms 64 bytes from 192.168.123.231: icmp_seq=68 ttl=64 time=2.934 ms 64 bytes from 192.168.123.231: icmp_seq=69 ttl=64 time=0.928 ms 64 bytes from 192.168.123.231: icmp_seq=70 ttl=64 time=9.007 ms 64 bytes from 192.168.123.231: icmp_seq=71 ttl=64 time=8.053 ms 64 bytes from 192.168.123.231: icmp_seq=72 ttl=64 time=7.651 ms 64 bytes from 192.168.123.231: icmp_seq=73 ttl=64 time=6.105 ms 64 bytes from 192.168.123.231: icmp_seq=74 ttl=64 time=5.113 ms 64 bytes from 192.168.123.231: icmp_seq=75 ttl=64 time=4.188 ms 64 bytes from 192.168.123.231: icmp_seq=76 ttl=64 time=3.270 ms 64 bytes from 192.168.123.231: icmp_seq=77 ttl=64 time=2.271 ms 64 bytes from 192.168.123.231: icmp_seq=78 ttl=64 time=1.284 ms 64 bytes from 192.168.123.231: icmp_seq=79 ttl=64 time=1.263 ms 64 bytes from 192.168.123.231: icmp_seq=80 ttl=64 time=10.384 ms 64 bytes from 192.168.123.231: icmp_seq=81 ttl=64 time=9.392 ms 64 bytes from 192.168.123.231: icmp_seq=82 ttl=64 time=8.461 ms 64 bytes from 192.168.123.231: icmp_seq=83 ttl=64 time=7.516 ms 64 bytes from 192.168.123.231: icmp_seq=84 ttl=64 time=6.152 ms 64 bytes from 192.168.123.231: icmp_seq=85 ttl=64 time=5.575 ms 64 bytes from 192.168.123.231: icmp_seq=86 ttl=64 time=4.635 ms 64 bytes from 192.168.123.231: icmp_seq=87 ttl=64 time=3.626 ms 64 bytes from 192.168.123.231: icmp_seq=88 ttl=64 time=2.728 ms 64 bytes from 192.168.123.231: icmp_seq=89 ttl=64 time=1.751 ms 64 bytes from 192.168.123.231: icmp_seq=90 ttl=64 time=0.758 ms 64 bytes from 192.168.123.231: icmp_seq=91 ttl=64 time=9.798 ms 64 bytes from 192.168.123.231: icmp_seq=92 ttl=64 time=8.824 ms 64 bytes from 192.168.123.231: icmp_seq=93 ttl=64 time=7.890 ms 64 bytes from 192.168.123.231: icmp_seq=94 ttl=64 time=6.932 ms 64 bytes from 192.168.123.231: icmp_seq=95 ttl=64 time=4.977 ms 64 bytes from 192.168.123.231: icmp_seq=96 ttl=64 time=4.015 ms 64 bytes from 192.168.123.231: icmp_seq=97 ttl=64 time=3.049 ms 64 bytes from 192.168.123.231: icmp_seq=98 ttl=64 time=2.093 ms 64 bytes from 192.168.123.231: icmp_seq=99 ttl=64 time=1.111 ms 64 bytes from 192.168.123.231: icmp_seq=100 ttl=64 time=10.213 ms 64 bytes from 192.168.123.231: icmp_seq=101 ttl=64 time=9.263 ms 64 bytes from 192.168.123.231: icmp_seq=102 ttl=64 time=8.283 ms 64 bytes from 192.168.123.231: icmp_seq=103 ttl=64 time=8.312 ms 64 bytes from 192.168.123.231: icmp_seq=104 ttl=64 time=7.379 ms 64 bytes from 192.168.123.231: icmp_seq=105 ttl=64 time=6.411 ms 64 bytes from 192.168.123.231: icmp_seq=106 ttl=64 time=5.409 ms 64 bytes from 192.168.123.231: icmp_seq=107 ttl=64 time=4.457 ms 64 bytes from 192.168.123.231: icmp_seq=108 ttl=64 time=3.472 ms 64 bytes from 192.168.123.231: icmp_seq=109 ttl=64 time=2.561 ms 64 bytes from 192.168.123.231: icmp_seq=110 ttl=64 time=1.598 ms 64 bytes from 192.168.123.231: icmp_seq=111 ttl=64 time=10.610 ms 64 bytes from 192.168.123.231: icmp_seq=112 ttl=64 time=9.636 ms 64 bytes from 192.168.123.231: icmp_seq=113 ttl=64 time=8.659 ms 64 bytes from 192.168.123.231: icmp_seq=114 ttl=64 time=7.661 ms 64 bytes from 192.168.123.231: icmp_seq=115 ttl=64 time=6.762 ms 64 bytes from 192.168.123.231: icmp_seq=116 ttl=64 time=5.771 ms 64 bytes from 192.168.123.231: icmp_seq=117 ttl=64 time=4.816 ms 64 bytes from 192.168.123.231: icmp_seq=118 ttl=64 time=3.888 ms 64 bytes from 192.168.123.231: icmp_seq=119 ttl=64 time=2.909 ms 64 bytes from 192.168.123.231: icmp_seq=120 ttl=64 time=0.936 ms ^C --- rpi1.rulingia.com ping statistics --- 121 packets transmitted, 121 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 0.758/5.921/19.996/3.362 ms -- Peter Jeremy [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAlGKIMYACgkQ/opHv/APuIcj7gCgkv3brwwR1g0nUOgTz9rxrgN2 lYoAn13GyAs01qVxKJv4YgUlZyy08lLu =tGOf -----END PGP SIGNATURE-----home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20130508095414.GB90732>