Bug 92071

Summary:	USB audio latency is (unnecessarily) high
Product:	PulseAudio	Reporter:	Arun Raghavan <arun>
Component:	alsa	Assignee:	pulseaudio-bugs
Status:	RESOLVED FIXED	QA Contact:	pulseaudio-bugs
Severity:	normal
Priority:	medium	CC:	lennart, nirbheek.chauhan
Version:	unspecified
Hardware:	All
OS:	All
Whiteboard:
i915 platform:		i915 features:
Bug Depends on:
Bug Blocks:	91504

Description Arun Raghavan 2015-09-22 09:10:53 UTC

Since we started respecting the BATCH flag, USB audio device latency has been fixed at 100ms in our default config.

The BATCH flag is probably not what we want here, so we need to have finer grained reporting from ALSA, which we can use to configure rewind safeguards for tsched mode (instead of always disabling it).

Faililng this, I'd like to at least have workaround for USB until this is fixed preoprly.

Comment 1 Arun Raghavan 2015-12-29 06:06:50 UTC

Pushed a workaround for this where we ignore the BATCH flag on USB devices. Closing for now, though the long term solution is to have the batch size reported by the ALSA driver and API so we can adapt appropriately rather than blindly disable timer-based scheduling.

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