Date: Thu, 16 Jun 2005 01:18:23 +0200 From: Jeremie Le Hen <jeremie@le-hen.org> To: freebsd-current@FreeBSD.org Subject: incorrect ping(8) interval with powerd(8) Message-ID: <20050615231823.GB2239@obiwan.tataz.chchile.org>
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Hi list,
as the subjects state, when powerd(8) is running and has set a lower
frequency than the processor's natural one, interval between each
packets are too long. When my laptop is plugged, I told powerd(8) to
run the processor at maximum speed (-a max).
Let's have a look at this :
%%%
jarjarbinks:root# sysctl hw.acpi.acline
hw.acpi.acline: 1
jarjarbinks:root# sysctl dev.cpu.0.freq
dev.cpu.0.freq: 1735
jarjarbinks:root# time ping -qc 2 192.168.1.1
PING 192.168.1.1 (192.168.1.1): 56 data bytes
--- 192.168.1.1 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.266/0.269/0.271/0.002 ms
real 0m1.003s
user 0m0.001s
sys 0m0.001s
jarjarbinks:root# sysctl hw.acpi.acline
hw.acpi.acline: 0
jarjarbinks:root# sysctl dev.cpu.0.freq
dev.cpu.0.freq: 216
jarjarbinks:root# time ping -qc 2 192.168.1.1
PING 192.168.1.1 (192.168.1.1): 56 data bytes
--- 192.168.1.1 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.637/0.814/0.991/0.177 ms
real 0m2.252s
user 0m0.004s
sys 0m0.021s
%%%
I check ping(8) source code and it appears it uses select(8) to wait
the desired amount of time. I don't think this is the intended
behaviour. Where does this bug (feature?) come from ?
Regards,
--
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >
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