[pulseaudio-tickets] [Bug 87395] New: tsched disabled when I use module-alsa-sink with 'mmap=0 tsched=1' parameters.

[bugzilla-daemon at freedesktop.org]

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: pulseaudio-bugs at lists.freedesktop.org
          Reporter: see2002 at gmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

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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