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Rob Funk
2004-02-20, 14:50
I may have started to figure out my performance problems. Besides killing
off some stray processes, I just did a tcpdump on my server machine, and
discovered a flood of packets going back and forth between the (Linux)
server and my slimp3.

My first thought was to reset the power on the slimp3, after which the
network traffic went back to normal. Only after that did I think to use
the tcpdump switches that show the content of the packets.

But here's a small sample of the flood I saw:

16:37:55.941103 marvin.local.funknet.net.3483 >
slimp3.local.funknet.net.3483: udp 194 (DF)
16:37:55.965089 marvin.local.funknet.net.3483 >
slimp3.local.funknet.net.3483: udp 18 (DF)
16:37:55.968048 slimp3.local.funknet.net.3483 >
marvin.local.funknet.net.3483: udp 18
16:37:56.025067 marvin.local.funknet.net.3483 >
slimp3.local.funknet.net.3483: udp 18 (DF)
16:37:56.027778 slimp3.local.funknet.net.3483 >
marvin.local.funknet.net.3483: udp 18
16:37:56.085063 marvin.local.funknet.net.3483 >
slimp3.local.funknet.net.3483: udp 18 (DF)
16:37:56.087982 slimp3.local.funknet.net.3483 >
marvin.local.funknet.net.3483: udp 18
16:37:56.145057 marvin.local.funknet.net.3483 >
slimp3.local.funknet.net.3483: udp 18 (DF)
16:37:56.147914 slimp3.local.funknet.net.3483 >
marvin.local.funknet.net.3483: udp 18
16:37:56.205061 marvin.local.funknet.net.3483 >
slimp3.local.funknet.net.3483: udp 18 (DF)
16:37:56.207687 slimp3.local.funknet.net.3483 >
marvin.local.funknet.net.3483: udp 18
16:37:56.265152 marvin.local.funknet.net.3483 >
slimp3.local.funknet.net.3483: udp 18 (DF)
16:37:56.268030 slimp3.local.funknet.net.3483 >
marvin.local.funknet.net.3483: udp 18
16:37:56.325060 marvin.local.funknet.net.3483 >
slimp3.local.funknet.net.3483: udp 18 (DF)
16:37:56.327819 slimp3.local.funknet.net.3483 >
marvin.local.funknet.net.3483: udp 18

Note how close together the time stamps are. This sample all happened in
less than half a second.

Slimp3 is running firmware 2.2, server is version 5.1.

Another possible data point is that we tend to disconnect the power to the
slimp3 fairly often, since it causes RF interference problems with radio
and TV.

--
==============================| "A slice of life isn't the whole cake
Rob Funk <rfunk (AT) funknet (DOT) net> | One tooth will never make a full grin"
http://www.funknet.net/rfunk | -- Chris Mars, "Stuck in Rewind"

Rob Funk
2004-02-20, 16:40
I wrote:
> I may have started to figure out my performance problems. Besides killing
> off some stray processes, I just did a tcpdump on my server machine, and
> discovered a flood of packets going back and forth between the (Linux)
> server and my slimp3.

Hmm. I just noticed that on my network switch the lights corresponding to
that machine occasionally go out for a second or so. So I'm starting to
think that my network interface may be dying. Dunno if that could have
anything to do with the flooding or not.

--
==============================| "A slice of life isn't the whole cake
Rob Funk <rfunk (AT) funknet (DOT) net> | One tooth will never make a full grin"
http://www.funknet.net/rfunk | -- Chris Mars, "Stuck in Rewind"