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>
next in thread | previous in thread | raw e-mail | index | archive | help
--qcHopEYAB45HaUaB Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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): =2E.. >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=3D0 ttl=3D64 time=3D19.996 ms 64 bytes from 192.168.123.231: icmp_seq=3D1 ttl=3D64 time=3D10.306 ms 64 bytes from 192.168.123.231: icmp_seq=3D2 ttl=3D64 time=3D9.342 ms 64 bytes from 192.168.123.231: icmp_seq=3D3 ttl=3D64 time=3D8.361 ms 64 bytes from 192.168.123.231: icmp_seq=3D4 ttl=3D64 time=3D7.365 ms 64 bytes from 192.168.123.231: icmp_seq=3D5 ttl=3D64 time=3D6.491 ms 64 bytes from 192.168.123.231: icmp_seq=3D6 ttl=3D64 time=3D5.477 ms 64 bytes from 192.168.123.231: icmp_seq=3D7 ttl=3D64 time=3D4.507 ms 64 bytes from 192.168.123.231: icmp_seq=3D8 ttl=3D64 time=3D3.590 ms 64 bytes from 192.168.123.231: icmp_seq=3D9 ttl=3D64 time=3D2.537 ms 64 bytes from 192.168.123.231: icmp_seq=3D10 ttl=3D64 time=3D1.627 ms 64 bytes from 192.168.123.231: icmp_seq=3D11 ttl=3D64 time=3D10.738 ms 64 bytes from 192.168.123.231: icmp_seq=3D12 ttl=3D64 time=3D9.709 ms 64 bytes from 192.168.123.231: icmp_seq=3D13 ttl=3D64 time=3D8.708 ms 64 bytes from 192.168.123.231: icmp_seq=3D14 ttl=3D64 time=3D7.790 ms 64 bytes from 192.168.123.231: icmp_seq=3D15 ttl=3D64 time=3D6.832 ms 64 bytes from 192.168.123.231: icmp_seq=3D16 ttl=3D64 time=3D5.853 ms 64 bytes from 192.168.123.231: icmp_seq=3D17 ttl=3D64 time=3D4.928 ms 64 bytes from 192.168.123.231: icmp_seq=3D18 ttl=3D64 time=3D2.948 ms 64 bytes from 192.168.123.231: icmp_seq=3D19 ttl=3D64 time=3D2.027 ms 64 bytes from 192.168.123.231: icmp_seq=3D20 ttl=3D64 time=3D1.015 ms 64 bytes from 192.168.123.231: icmp_seq=3D21 ttl=3D64 time=3D10.042 ms 64 bytes from 192.168.123.231: icmp_seq=3D22 ttl=3D64 time=3D9.156 ms 64 bytes from 192.168.123.231: icmp_seq=3D23 ttl=3D64 time=3D18.039 ms 64 bytes from 192.168.123.231: icmp_seq=3D24 ttl=3D64 time=3D7.217 ms 64 bytes from 192.168.123.231: icmp_seq=3D25 ttl=3D64 time=3D6.196 ms 64 bytes from 192.168.123.231: icmp_seq=3D26 ttl=3D64 time=3D5.287 ms 64 bytes from 192.168.123.231: icmp_seq=3D27 ttl=3D64 time=3D4.321 ms 64 bytes from 192.168.123.231: icmp_seq=3D28 ttl=3D64 time=3D3.350 ms 64 bytes from 192.168.123.231: icmp_seq=3D29 ttl=3D64 time=3D2.440 ms 64 bytes from 192.168.123.231: icmp_seq=3D30 ttl=3D64 time=3D1.385 ms 64 bytes from 192.168.123.231: icmp_seq=3D31 ttl=3D64 time=3D10.386 ms 64 bytes from 192.168.123.231: icmp_seq=3D32 ttl=3D64 time=3D9.469 ms 64 bytes from 192.168.123.231: icmp_seq=3D33 ttl=3D64 time=3D8.527 ms 64 bytes from 192.168.123.231: icmp_seq=3D34 ttl=3D64 time=3D7.161 ms 64 bytes from 192.168.123.231: icmp_seq=3D35 ttl=3D64 time=3D6.565 ms 64 bytes from 192.168.123.231: icmp_seq=3D36 ttl=3D64 time=3D5.629 ms 64 bytes from 192.168.123.231: icmp_seq=3D37 ttl=3D64 time=3D4.205 ms 64 bytes from 192.168.123.231: icmp_seq=3D38 ttl=3D64 time=3D3.697 ms 64 bytes from 192.168.123.231: icmp_seq=3D39 ttl=3D64 time=3D2.720 ms 64 bytes from 192.168.123.231: icmp_seq=3D40 ttl=3D64 time=3D1.748 ms 64 bytes from 192.168.123.231: icmp_seq=3D41 ttl=3D64 time=3D0.851 ms 64 bytes from 192.168.123.231: icmp_seq=3D42 ttl=3D64 time=3D9.869 ms 64 bytes from 192.168.123.231: icmp_seq=3D43 ttl=3D64 time=3D8.913 ms 64 bytes from 192.168.123.231: icmp_seq=3D44 ttl=3D64 time=3D6.915 ms 64 bytes from 192.168.123.231: icmp_seq=3D45 ttl=3D64 time=3D4.986 ms 64 bytes from 192.168.123.231: icmp_seq=3D46 ttl=3D64 time=3D4.045 ms 64 bytes from 192.168.123.231: icmp_seq=3D47 ttl=3D64 time=3D3.069 ms 64 bytes from 192.168.123.231: icmp_seq=3D48 ttl=3D64 time=3D2.137 ms 64 bytes from 192.168.123.231: icmp_seq=3D49 ttl=3D64 time=3D1.168 ms 64 bytes from 192.168.123.231: icmp_seq=3D50 ttl=3D64 time=3D10.172 ms 64 bytes from 192.168.123.231: icmp_seq=3D51 ttl=3D64 time=3D9.254 ms 64 bytes from 192.168.123.231: icmp_seq=3D52 ttl=3D64 time=3D8.272 ms 64 bytes from 192.168.123.231: icmp_seq=3D53 ttl=3D64 time=3D7.328 ms 64 bytes from 192.168.123.231: icmp_seq=3D54 ttl=3D64 time=3D6.375 ms 64 bytes from 192.168.123.231: icmp_seq=3D55 ttl=3D64 time=3D5.390 ms 64 bytes from 192.168.123.231: icmp_seq=3D56 ttl=3D64 time=3D4.037 ms 64 bytes from 192.168.123.231: icmp_seq=3D57 ttl=3D64 time=3D3.425 ms 64 bytes from 192.168.123.231: icmp_seq=3D58 ttl=3D64 time=3D2.435 ms 64 bytes from 192.168.123.231: icmp_seq=3D59 ttl=3D64 time=3D1.542 ms 64 bytes from 192.168.123.231: icmp_seq=3D60 ttl=3D64 time=3D10.591 ms 64 bytes from 192.168.123.231: icmp_seq=3D61 ttl=3D64 time=3D9.581 ms 64 bytes from 192.168.123.231: icmp_seq=3D62 ttl=3D64 time=3D8.686 ms 64 bytes from 192.168.123.231: icmp_seq=3D63 ttl=3D64 time=3D7.721 ms 64 bytes from 192.168.123.231: icmp_seq=3D64 ttl=3D64 time=3D6.804 ms 64 bytes from 192.168.123.231: icmp_seq=3D65 ttl=3D64 time=3D5.764 ms 64 bytes from 192.168.123.231: icmp_seq=3D66 ttl=3D64 time=3D4.777 ms 64 bytes from 192.168.123.231: icmp_seq=3D67 ttl=3D64 time=3D3.857 ms 64 bytes from 192.168.123.231: icmp_seq=3D68 ttl=3D64 time=3D2.934 ms 64 bytes from 192.168.123.231: icmp_seq=3D69 ttl=3D64 time=3D0.928 ms 64 bytes from 192.168.123.231: icmp_seq=3D70 ttl=3D64 time=3D9.007 ms 64 bytes from 192.168.123.231: icmp_seq=3D71 ttl=3D64 time=3D8.053 ms 64 bytes from 192.168.123.231: icmp_seq=3D72 ttl=3D64 time=3D7.651 ms 64 bytes from 192.168.123.231: icmp_seq=3D73 ttl=3D64 time=3D6.105 ms 64 bytes from 192.168.123.231: icmp_seq=3D74 ttl=3D64 time=3D5.113 ms 64 bytes from 192.168.123.231: icmp_seq=3D75 ttl=3D64 time=3D4.188 ms 64 bytes from 192.168.123.231: icmp_seq=3D76 ttl=3D64 time=3D3.270 ms 64 bytes from 192.168.123.231: icmp_seq=3D77 ttl=3D64 time=3D2.271 ms 64 bytes from 192.168.123.231: icmp_seq=3D78 ttl=3D64 time=3D1.284 ms 64 bytes from 192.168.123.231: icmp_seq=3D79 ttl=3D64 time=3D1.263 ms 64 bytes from 192.168.123.231: icmp_seq=3D80 ttl=3D64 time=3D10.384 ms 64 bytes from 192.168.123.231: icmp_seq=3D81 ttl=3D64 time=3D9.392 ms 64 bytes from 192.168.123.231: icmp_seq=3D82 ttl=3D64 time=3D8.461 ms 64 bytes from 192.168.123.231: icmp_seq=3D83 ttl=3D64 time=3D7.516 ms 64 bytes from 192.168.123.231: icmp_seq=3D84 ttl=3D64 time=3D6.152 ms 64 bytes from 192.168.123.231: icmp_seq=3D85 ttl=3D64 time=3D5.575 ms 64 bytes from 192.168.123.231: icmp_seq=3D86 ttl=3D64 time=3D4.635 ms 64 bytes from 192.168.123.231: icmp_seq=3D87 ttl=3D64 time=3D3.626 ms 64 bytes from 192.168.123.231: icmp_seq=3D88 ttl=3D64 time=3D2.728 ms 64 bytes from 192.168.123.231: icmp_seq=3D89 ttl=3D64 time=3D1.751 ms 64 bytes from 192.168.123.231: icmp_seq=3D90 ttl=3D64 time=3D0.758 ms 64 bytes from 192.168.123.231: icmp_seq=3D91 ttl=3D64 time=3D9.798 ms 64 bytes from 192.168.123.231: icmp_seq=3D92 ttl=3D64 time=3D8.824 ms 64 bytes from 192.168.123.231: icmp_seq=3D93 ttl=3D64 time=3D7.890 ms 64 bytes from 192.168.123.231: icmp_seq=3D94 ttl=3D64 time=3D6.932 ms 64 bytes from 192.168.123.231: icmp_seq=3D95 ttl=3D64 time=3D4.977 ms 64 bytes from 192.168.123.231: icmp_seq=3D96 ttl=3D64 time=3D4.015 ms 64 bytes from 192.168.123.231: icmp_seq=3D97 ttl=3D64 time=3D3.049 ms 64 bytes from 192.168.123.231: icmp_seq=3D98 ttl=3D64 time=3D2.093 ms 64 bytes from 192.168.123.231: icmp_seq=3D99 ttl=3D64 time=3D1.111 ms 64 bytes from 192.168.123.231: icmp_seq=3D100 ttl=3D64 time=3D10.213 ms 64 bytes from 192.168.123.231: icmp_seq=3D101 ttl=3D64 time=3D9.263 ms 64 bytes from 192.168.123.231: icmp_seq=3D102 ttl=3D64 time=3D8.283 ms 64 bytes from 192.168.123.231: icmp_seq=3D103 ttl=3D64 time=3D8.312 ms 64 bytes from 192.168.123.231: icmp_seq=3D104 ttl=3D64 time=3D7.379 ms 64 bytes from 192.168.123.231: icmp_seq=3D105 ttl=3D64 time=3D6.411 ms 64 bytes from 192.168.123.231: icmp_seq=3D106 ttl=3D64 time=3D5.409 ms 64 bytes from 192.168.123.231: icmp_seq=3D107 ttl=3D64 time=3D4.457 ms 64 bytes from 192.168.123.231: icmp_seq=3D108 ttl=3D64 time=3D3.472 ms 64 bytes from 192.168.123.231: icmp_seq=3D109 ttl=3D64 time=3D2.561 ms 64 bytes from 192.168.123.231: icmp_seq=3D110 ttl=3D64 time=3D1.598 ms 64 bytes from 192.168.123.231: icmp_seq=3D111 ttl=3D64 time=3D10.610 ms 64 bytes from 192.168.123.231: icmp_seq=3D112 ttl=3D64 time=3D9.636 ms 64 bytes from 192.168.123.231: icmp_seq=3D113 ttl=3D64 time=3D8.659 ms 64 bytes from 192.168.123.231: icmp_seq=3D114 ttl=3D64 time=3D7.661 ms 64 bytes from 192.168.123.231: icmp_seq=3D115 ttl=3D64 time=3D6.762 ms 64 bytes from 192.168.123.231: icmp_seq=3D116 ttl=3D64 time=3D5.771 ms 64 bytes from 192.168.123.231: icmp_seq=3D117 ttl=3D64 time=3D4.816 ms 64 bytes from 192.168.123.231: icmp_seq=3D118 ttl=3D64 time=3D3.888 ms 64 bytes from 192.168.123.231: icmp_seq=3D119 ttl=3D64 time=3D2.909 ms 64 bytes from 192.168.123.231: icmp_seq=3D120 ttl=3D64 time=3D0.936 ms ^C --- rpi1.rulingia.com ping statistics --- 121 packets transmitted, 121 packets received, 0.0% packet loss round-trip min/avg/max/stddev =3D 0.758/5.921/19.996/3.362 ms --=20 Peter Jeremy --qcHopEYAB45HaUaB Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAlGKIMYACgkQ/opHv/APuIcj7gCgkv3brwwR1g0nUOgTz9rxrgN2 lYoAn13GyAs01qVxKJv4YgUlZyy08lLu =tGOf -----END PGP SIGNATURE----- --qcHopEYAB45HaUaB--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20130508095414.GB90732>