svn commit: r43470 - head/en_US.ISO8859-1/htdocs/news/status
Gabor Pali
pgj at FreeBSD.org
Sat Jan 11 10:29:53 UTC 2014
Author: pgj
Date: Sat Jan 11 10:29:52 2014
New Revision: 43470
URL: http://svnweb.freebsd.org/changeset/doc/43470
Log:
- Add 2013Q4 report on cam(4) and geom(4) improvements
Submitted by: mav
Modified:
head/en_US.ISO8859-1/htdocs/news/status/report-2013-10-2013-12.xml
Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2013-10-2013-12.xml
==============================================================================
--- head/en_US.ISO8859-1/htdocs/news/status/report-2013-10-2013-12.xml Sat Jan 11 00:01:03 2014 (r43469)
+++ head/en_US.ISO8859-1/htdocs/news/status/report-2013-10-2013-12.xml Sat Jan 11 10:29:52 2014 (r43470)
@@ -19,7 +19,7 @@
<!-- XXX: Keep updating the number of entries -->
<p>Thanks to all the reporters for the excellent work! This report
- contains 10 entries and we hope you enjoy reading it.</p>
+ contains 11 entries and we hope you enjoy reading it.</p>
<p>The deadline for submissions covering between January and
March 2014 is April 7th, 2014.</p>
@@ -559,4 +559,53 @@
further.</task>
</help>
</project>
+
+ <project cat='kern'>
+ <title>GEOM Direct Dispatch and Fine-Grained CAM Locking</title>
+
+ <contact>
+ <person>
+ <name>
+ <given>Alexander</given>
+ <common>Motin</common>
+ </name>
+ <email>mav at FreeBSD.org</email>
+ </person>
+ </contact>
+
+ <links>
+ <url href="http://people.freebsd.org/~mav/disk.pdf">Slides from EuroBSDCon 2013, also describing this project</url>
+ <url href="http://svnweb.freebsd.org/changeset/base/260387">CAM improvements in the stable/10 branch</url>
+ <url href="http://svnweb.freebsd.org/changeset/base/260385">GEOM improvements in the stable/10 branch</url>
+ </links>
+
+ <body>
+ <p>The CAM and GEOM multi-processor scalability improvement
+ project has completed. The corresponding code has been committed
+ to &os; <tt>head</tt> and recently merged to the
+ <tt>stable/10</tt> branch, it shall appear in
+ <tt>10.1-RELEASE</tt>.</p>
+
+ <p>As part of this project, <tt>cam(4)</tt> (ATA/SCSI subsystem)
+ has received more fine-grained locking for better utilization of
+ multi-core systems. In addition, locking in <tt>geom(4)</tt>
+ (block storage subsystem) has been also polished, and a new
+ direct dispatch functionality was implemented to spread the load
+ between multiple threads and processors, and reduce the number
+ of context switches.</p>
+
+ <p>Thanks to these <tt>cam(4)</tt> and <tt>geom(4)</tt> changes,
+ the peak I/O rate has doubled on comptemporary hardware, reaching
+ up to 1,000,000 IOPS!</p>
+
+ <p>The project was sponsored by iXsystems, Inc.</p>
+ </body>
+
+ <help>
+ <task>Some CAM controller drivers (SIMs) could be also optimized
+ to get more benefits from this project, utilizing the new locking
+ models and direct command completions from multiple interrupt
+ threads.</task>
+ </help>
+ </project>
</report>
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