Date: Wed, 8 May 2013 18:59:01 +1000 From: Peter Jeremy <peter@rulingia.com> To: freebsd-arm@freebsd.org Subject: Sawtooth ping RTT on RPi Message-ID: <20130508085901.GA90732@server.rulingia.com>
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--VbJkn9YxBvnuCH5J Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable I've noticed a sawtooth-shaped cyclic pattern in ping RTTs to my RPi (running r249590M): 64 bytes from 192.168.123.231: icmp_seq=3D22 ttl=3D64 time=3D1.321 ms 64 bytes from 192.168.123.231: icmp_seq=3D23 ttl=3D64 time=3D10.312 ms 64 bytes from 192.168.123.231: icmp_seq=3D24 ttl=3D64 time=3D9.328 ms 64 bytes from 192.168.123.231: icmp_seq=3D25 ttl=3D64 time=3D8.335 ms 64 bytes from 192.168.123.231: icmp_seq=3D26 ttl=3D64 time=3D7.411 ms 64 bytes from 192.168.123.231: icmp_seq=3D27 ttl=3D64 time=3D6.448 ms 64 bytes from 192.168.123.231: icmp_seq=3D28 ttl=3D64 time=3D5.497 ms 64 bytes from 192.168.123.231: icmp_seq=3D29 ttl=3D64 time=3D4.508 ms 64 bytes from 192.168.123.231: icmp_seq=3D30 ttl=3D64 time=3D3.540 ms 64 bytes from 192.168.123.231: icmp_seq=3D31 ttl=3D64 time=3D2.588 ms 64 bytes from 192.168.123.231: icmp_seq=3D32 ttl=3D64 time=3D1.635 ms 64 bytes from 192.168.123.231: icmp_seq=3D33 ttl=3D64 time=3D0.738 ms 64 bytes from 192.168.123.231: icmp_seq=3D34 ttl=3D64 time=3D9.770 ms 64 bytes from 192.168.123.231: icmp_seq=3D35 ttl=3D64 time=3D8.805 ms 64 bytes from 192.168.123.231: icmp_seq=3D36 ttl=3D64 time=3D7.833 ms 64 bytes from 192.168.123.231: icmp_seq=3D37 ttl=3D64 time=3D6.843 ms 64 bytes from 192.168.123.231: icmp_seq=3D38 ttl=3D64 time=3D5.869 ms This doesn't appear with Linux (which has a RTT of 0.42ms with very little variance). What is causing the RTT pattern on FreeBSD? Haw does Linux manage to respond so much faster? --=20 Peter Jeremy --VbJkn9YxBvnuCH5J Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAlGKE9UACgkQ/opHv/APuIfvZQCgg62OWwxeBZwSPXeSvSVJz5Yb 53UAoILLTeYfxPSIo7dUR4PqDQhfYIU9 =Zqk+ -----END PGP SIGNATURE----- --VbJkn9YxBvnuCH5J--
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