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ALSA XRUN happen when playback or capture on each platform #231
Description
ALSA XRUN will random happen when playback or capture on APL, BYT, CNL.
This issue will be reproduce with high possibility with BUFFER_SIZE/PERIOD_SIZE=2
But audio functions are not affected by this issue.
This issue need developer to comment.
@xiulipan
Activity
lgirdwood commentedon Aug 17, 2018
@SinianYang we are missing a whole lot of details here. Logs, commit IDs, command line used in test etc.
xiulipan commentedon Aug 17, 2018
@lgirdwood
This is a normal case not specific to a simple commit.
This ALSA XRUN may not be our firmware bug or driver BUG,
Just a tracker for later dig in in ALSA.
lgirdwood commentedon Aug 17, 2018
@xiulipan I need to rule out if this is FS related as eMMC has high latency. i.e. does playing /dev/zero work ? or capturing to /dev/null ?
xiulipan commentedon Aug 17, 2018
@lgirdwood
This issue is here to track later findings.
I think we did not do this test now. Will update the result here later.
ZhendanYang commentedon Aug 21, 2018
@lgirdwood
There is no xrun when playing /dev/zero or capturing to /dev/null. But if I play /dev/zero and capture /dev/null at the same time, both overrun and underrun occur.
mengdonglin commentedon Sep 17, 2018
Remove branch label br-glk because all generic fixes on glk-003 branch have been merged by master. So testing with master branch will be okay for mature platforms. glk release branch does not focus on compatibility across platforms.
mengdonglin commentedon Sep 30, 2018
@ZhendanYang @bardliao Let's also check this issue after APL RVP or WHL RVP is set up
lgirdwood commentedon Oct 1, 2018
@ZhendanYang this is a test of the Linux scheduler, we have 2 ping pong buffers and we race to fill/empty them. Can you try mmap mode. 2 periods is rare in read()/write() io mode for this very reason.