https://bugs.freedesktop.org/show_bug.cgi?id=87395
Bug ID: 87395
Summary: tsched disabled when I use module-alsa-sink with
'mmap=0 tsched=1' parameters.
Product: PulseAudio
Version: unspecified
Hardware: All
OS: Linux (All)
Status: NEW
Severity: major
Priority: medium
Component: modules
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected]
Dear developers,
I had posted a question to mailing-list before:
http://lists.freedesktop.org/archives/pulseaudio-discuss/2014-December/022822.html
When I tried to load 'module-alsa-sink' with 'mmap=0 tsched=1' parameters,
tsched(timer-based scheduling) becomes disabled by default.
Currently, it seems tsched is allowed only mmap supported ALSA devices. But, I
found able to use tsched with 'mmap=0' option.
For instance, unix_write() function is for non-mmap driven function that was
written and regarded to tsched mode together.
Please refer below test patch for supporting tsched mode on non-mmap driven
ALSA configuration.
Thanks in advance,
KimJeongYeon
==========
diff -uNr ./a/alsa-sink.c ./b/alsa-sink.c
--- ./a/alsa-sink.c 2014-12-11 21:41:13.680373375 +0900
+++ ./b/alsa-sink.c 2014-12-11 21:45:50.032371336 +0900
@@ -2210,11 +2210,6 @@
u->use_mmap = use_mmap = false;
}
- if (use_tsched && (!b || !d)) {
- pa_log_info("Cannot enable timer-based scheduling, falling back to
sound IRQ scheduling.");
- u->use_tsched = use_tsched = false;
- }
-
if (u->use_mmap)
pa_log_info("Successfully enabled mmap() mode.");
diff -uNr ./a/alsa-util.c ./b/alsa-util.c
--- ./a/alsa-util.c 2014-12-11 21:41:13.680373375 +0900
+++ ./b/alsa-util.c 2014-12-11 21:46:46.228370922 +0900
@@ -240,9 +240,6 @@
goto finish;
}
- if (!_use_mmap)
- _use_tsched = false;
-
if (!pa_alsa_pcm_is_hw(pcm_handle))
_use_tsched = false;
==========
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