Reduce default AUDIO_BLK_MS from 40msec to 10msec on all platform except m68k
(m68k uses 40msec default as before). And remove the option from GENERIC. - It's not good idea to set such parameter in individual GENERICs. - 4msec is (probably no problem for most modern real hardware but) too aggressive to be default. - 10msec is too severe for antique machines but it's hard to draw a line.
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isaki
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@ -1,4 +1,4 @@
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# $NetBSD: GENERIC,v 1.563 2020/02/17 06:32:46 nisimura Exp $
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# $NetBSD: GENERIC,v 1.564 2020/03/28 08:35:36 isaki Exp $
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#
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# GENERIC machine description file
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#
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@ -22,7 +22,7 @@ include "arch/amd64/conf/std.amd64"
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options INCLUDE_CONFIG_FILE # embed config file in kernel binary
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#ident "GENERIC-$Revision: 1.563 $"
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#ident "GENERIC-$Revision: 1.564 $"
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maxusers 64 # estimated number of users
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@ -55,9 +55,6 @@ maxusers 64 # estimated number of users
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options INSECURE # disable kernel security levels - X needs this
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options AUDIO_BLK_MS=4 # make software with low latency needs performant
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# no substantial CPU overhead on this platform
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options RTC_OFFSET=0 # hardware clock is this many mins. west of GMT
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options NTP # NTP phase/frequency locked loop
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@ -1,5 +1,5 @@
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#
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# $NetBSD: GENERIC,v 1.74 2020/03/15 13:54:28 skrll Exp $
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# $NetBSD: GENERIC,v 1.75 2020/03/28 08:35:36 isaki Exp $
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#
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# GENERIC ARM (aarch32) kernel
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#
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@ -622,7 +622,6 @@ sun8icodec* at fdt? # Audio codec (sun8i)
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sunxicodec* at fdt? # Allwinner audio codec
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sunxii2s* at fdt? # I2S/PCM
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audio* at audiobus?
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options AUDIO_BLK_MS=4
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spkr* at audio?
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# SDMMC
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@ -1,5 +1,5 @@
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#
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# $NetBSD: GENERIC64,v 1.147 2020/03/27 01:43:58 thorpej Exp $
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# $NetBSD: GENERIC64,v 1.148 2020/03/28 08:35:36 isaki Exp $
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#
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# GENERIC ARM (aarch64) kernel
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#
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@ -481,7 +481,6 @@ h3codec* at fdt? # Allwinner H3 audio codec (analog part)
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a64acodec* at fdt? # Allwinner A64 audio codec (analog part)
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sunxii2s* at fdt? # Allwinner I2S/PCM
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audio* at audiobus?
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options AUDIO_BLK_MS=4
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spkr* at audio? # PC speaker (synthesized)
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@ -1,4 +1,4 @@
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# $NetBSD: GENERIC,v 1.1226 2020/03/16 19:09:34 nia Exp $
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# $NetBSD: GENERIC,v 1.1227 2020/03/28 08:35:36 isaki Exp $
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#
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# GENERIC machine description file
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#
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@ -22,7 +22,7 @@ include "arch/i386/conf/std.i386"
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options INCLUDE_CONFIG_FILE # embed config file in kernel binary
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#ident "GENERIC-$Revision: 1.1226 $"
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#ident "GENERIC-$Revision: 1.1227 $"
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maxusers 64 # estimated number of users
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@ -77,9 +77,6 @@ options MULTIBOOT # Multiboot support (see multiboot(8))
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options INSECURE # disable kernel security levels - X needs this
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options AUDIO_BLK_MS=4 # make software with low latency needs performant
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# no substantial CPU overhead on this platform
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options RTC_OFFSET=0 # hardware clock is this many mins. west of GMT
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options NTP # NTP phase/frequency locked loop
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@ -1,4 +1,4 @@
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# $NetBSD: GENERIC,v 1.365 2020/03/16 19:09:34 nia Exp $
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# $NetBSD: GENERIC,v 1.366 2020/03/28 08:35:36 isaki Exp $
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#
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# GENERIC machine description file
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#
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@ -22,7 +22,7 @@ include "arch/macppc/conf/std.macppc"
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options INCLUDE_CONFIG_FILE # embed config file in kernel binary
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#ident "GENERIC-$Revision: 1.365 $"
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#ident "GENERIC-$Revision: 1.366 $"
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maxusers 32
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@ -31,9 +31,6 @@ options ALTIVEC # Include AltiVec support
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# Standard system options
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options INSECURE # disable kernel security levels
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options AUDIO_BLK_MS=4 # make software with low latency needs performant
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# no substantial CPU overhead on this platform
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options RTC_OFFSET=0 # hardware clock is this many mins. west of GMT
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options NTP # NTP phase/frequency locked loop
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options KTRACE # system call tracing via ktrace(1)
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@ -1,4 +1,4 @@
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# $NetBSD: GENERIC,v 1.225 2020/03/16 19:09:34 nia Exp $
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# $NetBSD: GENERIC,v 1.226 2020/03/28 08:35:36 isaki Exp $
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#
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# GENERIC machine description file
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#
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@ -22,7 +22,7 @@ include "arch/sparc64/conf/std.sparc64"
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options INCLUDE_CONFIG_FILE # embed config file in kernel binary
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#ident "GENERIC-$Revision: 1.225 $"
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#ident "GENERIC-$Revision: 1.226 $"
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maxusers 64
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@ -48,9 +48,6 @@ config netbsd root on ? type ?
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#options UVMHIST
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#options UVMHIST_PRINT # Loud!
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options AUDIO_BLK_MS=4 # make software with low latency needs performant
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# no substantial CPU overhead on this platform
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## System call tracing (see ktrace(1)).
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options KTRACE
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@ -1,4 +1,4 @@
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/* $NetBSD: audiodef.h,v 1.12 2020/03/05 15:18:55 riastradh Exp $ */
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/* $NetBSD: audiodef.h,v 1.13 2020/03/28 08:35:36 isaki Exp $ */
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/*
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* Copyright (C) 2017 Tetsuya Isaki. All rights reserved.
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@ -44,13 +44,21 @@
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/*
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* Hardware blocksize in msec.
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* We use 40 msec as default. (1 / 40ms) = 25 = 5^2.
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* We use 10 msec as default for most platforms. But it's too severe for
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* most m68k.
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*
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* 40 msec was initially choosen for the following reason:
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* (1 / 40ms) = 25 = 5^2. Thus, the frequency is factored by 5.
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* In this case, the number of frames in a block can be an integer
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* even if the frequency is a multiple of 100 (44100, 48000, etc),
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* or even if 15625Hz (vs(4)).
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*/
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#if !defined(AUDIO_BLK_MS)
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#define AUDIO_BLK_MS 40
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# if defined(__m68k__)
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# define AUDIO_BLK_MS 40
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# else
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# define AUDIO_BLK_MS 10
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# endif
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#endif
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/*
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