Get correct maxio from the controller and drop the tunable.

The default (64K) is too pessimistic for "new comm" hardware.
Also, this is bad because multiple controllers get limited by
the global tunable.

Reviewed by:	scottl
Approved by:	re (kensmith)

1 files changed, 2 insertions, 22 deletions

diff --git a/share/man/man4/aac.4 b/share/man/man4/aac.4
index 6ad88c2..d0f3701 100644
--- a/share/man/man4/aac.4
+++ b/share/man/man4/aac.4
@@ -23,7 +23,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\" $FreeBSD$
-.Dd June 27, 2008
+.Dd July 10, 2009
 .Dt AAC 4
 .Os
 .Sh NAME
@@ -86,24 +86,6 @@ Linux-compatible
 .Xr ioctl 2
 interface for the management device will be enabled and will allow
 Linux-based management applications to control the card.
-.Ss Tuning
-The read-only sysctl
-.Va hw.aac.iosize_max
-defaults to 65536 and may be set at boot time to another value via
-.Xr loader 8 .
-This value determines the maximum data transfer size allowed
-to/from an array.
-Setting it higher will result in better performance,
-especially for large sequential access patterns.
-.Em Beware :
-internal limitations
-of the card limit this value to 64K for arrays with many members.
-While it may be safe to raise this value, this is done
-.Em at the operator's own risk .
-Note also that
-performance peaks at a value of 96K,
-and drops off dramatically at 128K,
-due to other limitations of the card.
 .Sh HARDWARE
 Controllers supported by the
 .Nm
@@ -300,9 +282,7 @@ and are also queued for retrieval by a management application.
 .Xr kld 4 ,
 .Xr linux 4 ,
 .Xr scsi 4 ,
-.Xr kldload 8 ,
-.Xr loader 8 ,
-.Xr sysctl 8
+.Xr kldload 8
 .Sh HISTORY
 The
 .Nm