From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Boreham Date: Tue, 29 Nov 2005 19:07:54 +0000 Subject: Re: [LARTC] Optimizing linux for the routing of realtime video Message-Id: <438CA70A.8030908@boreham.org> MIME-Version: 1 Content-Type: multipart/mixed; boundary="===============2004828865==" List-Id: References: <01f001c5f517$826cf9c0$c901a8c0@jtwin> In-Reply-To: <01f001c5f517$826cf9c0$c901a8c0@jtwin> To: lartc@vger.kernel.org This is a multi-part message in MIME format. --===============2004828865== Content-Type: multipart/alternative; boundary="------------050808090903070108090501" This is a multi-part message in MIME format. --------------050808090903070108090501 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Justin Todd wrote: > I'm currently trying to optimize a linux machine which acts as a Layer 3 > router of RTP H.263 video. Occassionally I'll get delays related to > layer 2 > wireless retries, thus rendering the video on the recieving end > stale/useless. Maintaining QoS over wireless links, especially in the presence of interference is tricky, perhaps impossible. My gut feel is that your problems are likely all wireless-related and the solution will lie there too. Perhaps the radios are queuing subsequent packets behind the one they attempt to re-transmit ? Often there are tweakable parameters in the radios that you can try to play with (enable RTS for example). Good luck ! --------------050808090903070108090501 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Justin Todd wrote:

I'm currently trying to optimize a linux machine which acts as a Layer 3
router of RTP H.263 video. Occassionally I'll get delays related to layer 2
wireless retries, thus rendering the video on the recieving end
stale/useless.

Maintaining QoS over wireless links, especially in the presence of interference
is tricky, perhaps impossible. My gut feel is that your problems are likely all
wireless-related and the solution will lie there too. Perhaps the radios are
queuing subsequent packets behind the one they attempt to re-transmit ?
Often there are tweakable parameters in the radios that you can try to play
with (enable RTS for example).

Good luck !

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