On Wed, May 14, 2014 at 2:57 AM, Łukasz Wójcik <[email protected]>wrote: > > I would appreciate any clues and suggestions on how to improve the latency > situation. >
I'm unfamiliar with BSD driver development but here are a couple things I might check: - Ensure the interrupts are being acknowledged properly by the driver. If interrupts were left un-acknowledged, it could produce this scenario. - Ensure all memory addresses are mapped properly regarding the descriptor ring. If memory addresses were incorrectly loaded to the card for the dring, it may cause similar issues. - Time the irq handler to find it's running time. Linux has a tracer for this, maybe BSD does as well. (I think this is least likely, unless some BSD quirk is hanging up in the middle of the irq routine) Also, could anyone explain what exactly 'rxident' is ? > rxident is just a counter that the driver uses to estimate how fast or slow the card is processing the audio. This is then used to set a new latency value during a missed interrupt event. -- Russ Meyerriecks Digium, Inc. | Linux Kernel Developer 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA direct: +1 256-428-6025 Check us out at: www.digium.com & www.asterisk.org
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