Dear developers,
I have question something about selecting logic between timer-based and IRQ
scheduling.
When I tried to load 'module-alsa-sink' with 'mmap=0 tsched=1' parameters,
tsched(timer-based scheduling) becomes disabled by below codes.
It seems tsched is allowed only mmap supported ALSA devices. Why tsched
disabled while use non-mmap driven ALSA?
So, I found able to use tsched with 'mmap=0' option with below workaround
code.
I think it seems possible to use 'mmap=0 tsched=1' together. There are any
reasons for that?
==========
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;
==========
Thanks in advance,
KimJeongYeon
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