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Removed paragraph about "new experimental feature" the hw.ata.tags
which sysctl -a knows nothing about.
Fix typos while I'm here.

PR:	docs/66493
Submitted by:	Julien Gabel <jpeg@thilelli.net>
This commit is contained in:
Jens Schweikhardt 2004-06-06 12:30:21 +00:00
parent d8beb0fd3b
commit b2043d225e
1 changed files with 4 additions and 16 deletions
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20
share/man/man7/tuning.7
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@ -12,7 +12,7 @@
.Nd performance tuning under FreeBSD
.Sh SYSTEM SETUP - DISKLABEL, NEWFS, TUNEFS, SWAP
When using
.Xr disklabel 8
.Xr bsdlabel 8
or
.Xr sysinstall 8
to lay out your file systems on a hard disk it is important to remember
@ -442,7 +442,7 @@ Note that setting too high a value
bad clustering performance.
Do not set this value arbitrarily high!
Also,
higher write queueing values may add latency to reads occuring at the same
higher write queueing values may add latency to reads occurring at the same
time.
.Pp
There are various other buffer-cache and VM page cache related sysctls.
@ -857,18 +857,6 @@ loader tunable to 1.
More information on tuning the ATA driver system may be found in the
.Xr ata 4
man page.
.Pp
There is a new experimental feature for IDE hard drives called
.Va hw.ata.tags
(you also set this in the boot loader) which allows write caching to be safely
turned on.
This brings SCSI tagging features to IDE drives.
As of this
writing only IBM DPTA and DTLA drives support the feature.
Warning!
These
drives apparently have quality control problems and I do not recommend
purchasing them at this time.
If you need performance, go with SCSI.
.Sh CPU, MEMORY, DISK, NETWORK
The type of tuning you do depends heavily on where your system begins to
@ -898,7 +886,7 @@ The first line of defense for
improving network performance is to make sure you are using switches instead
of hubs, especially these days where switches are almost as cheap.
Hubs
have severe problems under heavy loads due to collision backoff and one bad
have severe problems under heavy loads due to collision back-off and one bad
host can severely degrade the entire LAN.
Second, optimize the network path
as much as possible.
@ -932,9 +920,9 @@ over services you export from your box (web services, email).
.Xr hier 7 ,
.Xr ports 7 ,
.Xr boot 8 ,
.Xr bsdlabel 8 ,
.Xr ccdconfig 8 ,
.Xr config 8 ,
.Xr disklabel 8 ,
.Xr fsck 8 ,
.Xr ifconfig 8 ,
.Xr ipfw 8 ,