NetBSD Problem Report #35961

From www@NetBSD.org  Fri Mar  9 13:57:37 2007
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Date: Fri,  9 Mar 2007 13:57:37 +0000 (UTC)
From: blair.sadewitz@gmail.com
Reply-To: blair.sadewitz@gmail.com
To: gnats-bugs@NetBSD.org
Subject: azalia_mappage() is unimplemented, applications requiring mmap() access do not work, a lot of audio drop-outs or excessive latency, etc.
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>Number:         35961
>Category:       kern
>Synopsis:       azalia_mappage() is unimplemented, applications requiring mmap() access do not work, a lot of audio drop-outs or excessive latency, etc.
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 09 14:00:00 +0000 2007
>Closed-Date:    Tue Oct 14 15:59:04 +0000 2014
>Last-Modified:  Tue Oct 14 15:59:04 +0000 2014
>Originator:     Blair Sadewitz
>Release:        4.99.13
>Organization:
>Environment:
NetBSD dexamyl 4.99.13 NetBSD 4.99.13 (DEXAMYL) #0: Fri Mar  9 02:01:15 EST 2007  blair@dexamyl:/usr/src/sys/arch/amd64/compile/DEXAMYL amd64
>Description:
azalia(4) seems to be one of the only audio drivers that do not support mmap() of the DMA buffer.  This results in poor audio performance even under moderate system load.  I have a Pentium D 3GHz processor with 1GB of RAM, and using both cores--even running processes with pri +20--will result in a buffer underrun and/or other errors that lead to the stream stuttering indefinitely until the stream is restarted.

Also, some audio applications need this functionality to work properly.

>How-To-Repeat:
Try using audio/jack or playing audio under moderate-heavy system load or during disk I/O.
>Fix:
Implement azalia_mappage().  What is different about azalia(4) that makes this difficult?  I wouldn't mind if there were only one standard mmap sample rate.  It would be nice if the mmap-related ioctl()s (buffer position, etc) were available, though.

Thank you for your attention to this, it is appreciated.  Not a high priority, but IMHO it is important.

>Release-Note:

>Audit-Trail:

State-Changed-From-To: open->feedback
State-Changed-By: dholland@NetBSD.org
State-Changed-When: Mon, 07 Sep 2009 18:58:54 +0000
State-Changed-Why:
please try the new hdaudio(4) in current :-)


State-Changed-From-To: feedback->suspended
State-Changed-By: jmcneill@NetBSD.org
State-Changed-When: Mon, 07 Sep 2009 22:47:00 +0000
State-Changed-Why:
The hdaudio(4) driver has code in place to support this, but AUDIO_PROP_MMAP
capability is not reported as it will not work until port-i386/42010 is
resolved.


From: "Jonathan A. Kollasch" <jakllsch@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/35961 CVS commit: src/sys/dev/pci/hdaudio
Date: Fri, 9 May 2014 20:10:49 +0000

 Module Name:	src
 Committed By:	jakllsch
 Date:		Fri May  9 20:10:49 UTC 2014

 Modified Files:
 	src/sys/dev/pci/hdaudio: hdafg.c

 Log Message:
 Enable AUDIO_PROP_MMAP in hdafg(4).

 Addresses PR#48792 and PR#35961.


 To generate a diff of this commit:
 cvs rdiff -u -r1.19 -r1.20 src/sys/dev/pci/hdaudio/hdafg.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

State-Changed-From-To: suspended->feedback
State-Changed-By: jakllsch@NetBSD.org
State-Changed-When: Fri, 09 May 2014 20:19:06 +0000
State-Changed-Why:
azalia(4) is deprecated, and the replacement hdafg(4) driver should now support mmap


From: Nat Sloss <nathanialsloss@yahoo.com.au>
To: "gnats-bugs" <gnats-bugs@netbsd.org>
Cc: 
Subject: Re: kern/35961
Date: Sun, 21 Sep 2014 22:01:45 +1000

 Hi,

 I have a hdafg supported hdaudio controller.

 When using a recent kernel from NetBSD-current kernel from 201409 and 
 I've found that pulseaudio-5.0 from pkgsrc prefers to use memory mapped 
 audio.

 However I had to disable this in the pulseaudio configuration as the sound
 would just loop over the same small samples of the audio I was playing.

 So I can say that the mmap changes don't work for me.

 Regards,

 Nat.

State-Changed-From-To: feedback->open
State-Changed-By: dholland@NetBSD.org
State-Changed-When: Tue, 14 Oct 2014 15:55:32 +0000
State-Changed-Why:
feedback received


State-Changed-From-To: open->closed
State-Changed-By: dholland@NetBSD.org
State-Changed-When: Tue, 14 Oct 2014 15:59:04 +0000
State-Changed-Why:
however, at this point I think this has become a duplicate of 48792.


>Unformatted:

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