RE: Lot of jitters occur during Video streaming through HostAP

From: Manjunathan PY (
Date: 2002-08-13 05:21:40 UTC

On Mon, Aug 12, 2002 at 08:12:29PM +0530, Manjunathan PY wrote:

> Can anyone tell me why there is a lot of jitters during video streaming
> through D-Link DWL 650 PCMCIA card which acting as a Access Point.
> In fact the video is displayed frame by frame on the mobile station.

>Is the video displayed on the AP running Host AP driver or in the
>station associated to the AP (running Host AP driver)? Which version of
>Host AP driver you used?

 In the station assocated to the AP running Host AP driver.    Version used is Prism2-2002-05-19.tar.gz

>Prism2 cards use quite CPU consuming method for frame copying between
>the card and host CPU. Current version of the driver does this copying
>in the interrupt handler for RX and with interrupts disabled for TX
>(this should be changed to operate without disabling interrupts if
>possible). This might well cause problems to applications needed exact
>timing and small latencies like video playback.

How do I configure the HostAP driver?, such that I get maximum performance out of it ( even if it is CPU intensive operation on AP ).

Thanks for the prompt reply!
Manjunathan PY

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