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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[-- Attachment #1 --] 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=22 ttl=64 time=1.321 ms 64 bytes from 192.168.123.231: icmp_seq=23 ttl=64 time=10.312 ms 64 bytes from 192.168.123.231: icmp_seq=24 ttl=64 time=9.328 ms 64 bytes from 192.168.123.231: icmp_seq=25 ttl=64 time=8.335 ms 64 bytes from 192.168.123.231: icmp_seq=26 ttl=64 time=7.411 ms 64 bytes from 192.168.123.231: icmp_seq=27 ttl=64 time=6.448 ms 64 bytes from 192.168.123.231: icmp_seq=28 ttl=64 time=5.497 ms 64 bytes from 192.168.123.231: icmp_seq=29 ttl=64 time=4.508 ms 64 bytes from 192.168.123.231: icmp_seq=30 ttl=64 time=3.540 ms 64 bytes from 192.168.123.231: icmp_seq=31 ttl=64 time=2.588 ms 64 bytes from 192.168.123.231: icmp_seq=32 ttl=64 time=1.635 ms 64 bytes from 192.168.123.231: icmp_seq=33 ttl=64 time=0.738 ms 64 bytes from 192.168.123.231: icmp_seq=34 ttl=64 time=9.770 ms 64 bytes from 192.168.123.231: icmp_seq=35 ttl=64 time=8.805 ms 64 bytes from 192.168.123.231: icmp_seq=36 ttl=64 time=7.833 ms 64 bytes from 192.168.123.231: icmp_seq=37 ttl=64 time=6.843 ms 64 bytes from 192.168.123.231: icmp_seq=38 ttl=64 time=5.869 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? -- Peter Jeremy [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAlGKE9UACgkQ/opHv/APuIfvZQCgg62OWwxeBZwSPXeSvSVJz5Yb 53UAoILLTeYfxPSIo7dUR4PqDQhfYIU9 =Zqk+ -----END PGP SIGNATURE-----home | help
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