Date: Thu, 9 Jul 2009 16:59:29 +0000 (UTC) From: Joel Dahl <joel@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r195503 - head/share/man/man4 Message-ID: <200907091659.n69GxTlO091362@svn.freebsd.org>
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Author: joel (doc committer) Date: Thu Jul 9 16:59:29 2009 New Revision: 195503 URL: http://svn.freebsd.org/changeset/base/195503 Log: Adjust the description of hw.snd.feeder_rate_polyphase_max and hw.snd.compat_linux_mmap a bit. Submitted by: ariff Approved by: re (blanket) Modified: head/share/man/man4/pcm.4 Modified: head/share/man/man4/pcm.4 ============================================================================== --- head/share/man/man4/pcm.4 Thu Jul 9 16:40:00 2009 (r195502) +++ head/share/man/man4/pcm.4 Thu Jul 9 16:59:29 2009 (r195503) @@ -25,7 +25,7 @@ .\" .\" $FreeBSD$ .\" -.Dd July 7, 2009 +.Dd July 9, 2009 .Dt SOUND 4 .Os .Sh NAME @@ -210,10 +210,22 @@ are global settings and are device specific. .Bl -tag -width indent .It Va hw.snd.compat_linux_mmap -Enable to allow PROT_EXEC page mappings. -All Linux applications using sound and +Linux .Xr mmap 2 -require this. +compability. +The following values are supported (default is 0): +.Bl -tag -width 2n +.It -1 +Force disabling/denying PROT_EXEC +.Xr mmap 2 +requests. +.It 0 +Auto detect proc/ABI type, allow +.Xr mmap 2 +for Linux applications, and deny for everything else. +.It 1 +Always allow PROT_EXEC page mappings. +.El .It Va hw.snd.default_auto Enable to automatically assign default sound unit to the most recent attached device. @@ -240,6 +252,8 @@ Minimum allowable sample rate. .It Va hw.snd.feeder_rate_polyphase_max Adjust to set the maximum number of allowed polyphase entries during the process of building resampling filters. +Disabling polyphase resampling has the benefit of reducing memory usage, at +the expense of slower and lower quality conversion. Only applicable when the SINC interpolator is used. Default value is 183040. Set to 0 to disable polyphase resampling.
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