svn commit: r48685 - head/en_US.ISO8859-1/htdocs/news/status

[Warren Block]

Author: wblock
Date: Wed Apr 20 14:23:55 2016
New Revision: 48685
URL: https://svnweb.freebsd.org/changeset/doc/48685

Log:
  Minor edits to the CAM report.

Modified:
  head/en_US.ISO8859-1/htdocs/news/status/report-2016-01-2016-03.xml

Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2016-01-2016-03.xml
==============================================================================
--- head/en_US.ISO8859-1/htdocs/news/status/report-2016-01-2016-03.xml	Wed Apr 20 13:25:07 2016	(r48684)
+++ head/en_US.ISO8859-1/htdocs/news/status/report-2016-01-2016-03.xml	Wed Apr 20 14:23:55 2016	(r48685)
@@ -2549,37 +2549,36 @@
       <p>An enhanced CAM I/O scheduler has been committed to the tree.
 	By default, this scheduler implements the old behavior.
 	In addition, an advanced adaptive scheduler is available.
-	Along with the scheduler, SATA disks can now used Queued Trims
+	Along with the scheduler, SATA disks can now use Queued Trims
 	with devices that support them. Details about the new
 	scheduler are available in the
 	<a href="https://people.freebsd.org/~imp/bsdcan2015/iosched-v3.pdf">I/O Scheduling in FreeBSD's CAM Subsystem article (PDF)</a>
 	or from
 	<a href="https://www.youtube.com/watch?v=3WqOLolj5EU">the BSDCan 2015 talk</a>.</p>
 
-      <p>In addition to the default scheduler, an advanced, adaptive I/O
-        scheduler is included. It is disabled by default, but can be enabled
-	with options CAM_ADAPTIVE_IOSCHED in your kernel config file. This
-	scheduler lets you favor reads over writes (or vice versa), control
-	the iops, bandwidth or concurrent operations (read, write, trim), and
-	lets you select static or dynamic control of these operations. In
+      <p>The adaptive I/O scheduler is disabled by default, but can be enabled
+	with options CAM_ADAPTIVE_IOSCHED in the kernel config file. This
+	scheduler allows favoring reads over writes (or vice versa), controlling
+	the IOPs, bandwidth, or concurrent operations (read, write, trim), and
+	permits the selection of static or dynamic control of these operations. In
 	addition, a number of statistics are collected for drive operations
 	that are published via sysctl. One advanced use for the adaptive I/O
 	scheduler is to compensate for deficiencies in some consumer-grade
-	SSDs. Some SSDs exhibit a performance cliff if you write too much data
+	SSDs. These SSDs exhibit a performance cliff if too much data is written
 	to them too quickly due to internal garbage collection. Without the
 	I/O scheduler, read and write performance drop substantially once
 	garbage collection kicks in. The adaptive I/O scheduler can be
 	configured to monitor read latency. As read latency climbs, the I/O
-	schedulers reduces the allowed write throughput, within limits, to
+	scheduler reduces the allowed write throughput, within limits, to
 	attempt to maximize read performance. A simple use of the adaptive I/O
-	scheduler would be to limit write bandwidth, iops or concurrent
+	scheduler would be to limit write bandwidth, IOPs or concurrent
         operations statically.</p>
 
       <p>Future work on the I/O scheduler will be coupled with
         improvements to the upper layers. The upper layers will be
         enhanced to communicate how urgent I/O requests are. The I/O
-        scheduler will communicate how full the I/O queues are to the
-        upper layers so less urgent I/O can be submitted to the lower
+        scheduler will inform the upper layers of how full the I/O queues are,
+        so less urgent I/O can be submitted to the lower
         layers as quickly as possible without overwhelming the lower
         layers or starving other devices of requests.</p>