svn commit: r187661 - head/share/man/man7
kostikbel at gmail.com
Sat Jan 24 06:25:33 PST 2009
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
> Add a comment on kern.ipc.maxpipekva.
> PR: 105997
> Reviewed by: keramida
> 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
> .Sh NAME
> @@ -402,6 +402,16 @@ In this document we will only cover the
> on the system.
> +.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
> .Va kern.ipc.shm_use_phys
> sysctl defaults to 0 (off) and may be set to 0 (off) or 1 (on).
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