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Old 7th December 2008
thundur thundur is offline
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Default ral wireless card slow when acting as hostap

Hi all

I have a server with a ralink rt2651 as wireless network device and I have configured the system to be running in access point mode (hostap) with wpa2 security.
Basically it works, but when I want to stream audio from a connected laptop to a connected apple airport express, the sound 'stutters' due to what I think are network throughput issues.

The same thing with a regular wireless router works with the sound never stuttering.

Has anyone an idea what is causing the problem?
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Old 7th December 2008
J65nko J65nko is offline
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Does the netstat -in output show errors or collisions?
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Old 8th December 2008
thundur thundur is offline
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Code:
# netstat -in
Name    Mtu Network       Address              Ipkts Ierrs    Opkts Oerrs  Coll
ral0   2290 <Link#1>      00:0c:f6:xx:xx:xx   989916     0   979643  2145     0
[...]
#
The Oerrs for this network device increase really slowly (+/- 2 on a 76MB upload from my laptop to the server). While streaming, they Oerrs increase at a higher rate (+/- 1 per 2 seconds)

Last edited by thundur; 8th December 2008 at 07:59 PM.
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Old 8th December 2008
J65nko J65nko is offline
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So the ouput errors increase, while streaming.

I am a quite old-fashioned guy, who still uses CD players and UTP cabling for networking, and I have no idea which TCP/IP protocol you use for streaming.
You can see protocol statistics, including errors, with netstat -s or netstat -ss. See netstat(1).

You could try to give a higher priority (negative number) to the streaming process by using renice(8). Use top to see the resource usage. You also can use top to alter the scheduling priorities.
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Last edited by J65nko; 9th December 2008 at 12:50 AM. Reason: fixed typo
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Old 8th December 2008
thundur thundur is offline
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The streaming uses the RAOP protocol, which is based on RTP (Real-time Transport Protocol) which uses UDP.
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