svn commit: r187661 - head/share/man/man7

[Kostik Belousov]

On Sat, Jan 24, 2009 at 01:46:46AM +0000, Tom Rhodes wrote:
> Author: trhodes
> Date: Sat Jan 24 01:46:46 2009
> New Revision: 187661
> URL: http://svn.freebsd.org/changeset/base/187661
> 
> Log:
>   Add a comment on kern.ipc.maxpipekva.
>   
>   PR:		105997
>   Reviewed by:	keramida
> 
> Modified:
>   head/share/man/man7/tuning.7
> 
> Modified: head/share/man/man7/tuning.7
> ==============================================================================
> --- head/share/man/man7/tuning.7	Sat Jan 24 01:34:22 2009	(r187660)
> +++ head/share/man/man7/tuning.7	Sat Jan 24 01:46:46 2009	(r187661)
> @@ -23,7 +23,7 @@
>  .\"
>  .\" $FreeBSD$
>  .\"
> -.Dd November 19, 2007
> +.Dd January 23, 2009
>  .Dt TUNING 7
>  .Os
>  .Sh NAME
> @@ -402,6 +402,16 @@ In this document we will only cover the 
>  on the system.
>  .Pp
>  The
> +.Va kern.ipc.maxpipekva
> +loader tunable is used to set a hard limit on the amount of pageable
> +address space available.
The formulation is very misleading. This is *the* KVA for pipe buffers
mappings, not *a* pageable KVA.
> +This value is auto tuned by the system, but may require manual tuning
> +in a few rare cases.
> +Increasing this value to a higher setting, such as `25165824' might
> +improve performance on systems where pageable address space is
> +quickly exhausted.
Again, the space for mapping of the pipe buffers. Also, you should note
that exhausting of the space is not fatal, and cause pipes to fall back
to double-copy.

> +.Pp
> +The
>  .Va kern.ipc.shm_use_phys
>  sysctl defaults to 0 (off) and may be set to 0 (off) or 1 (on).
>  Setting
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