svn commit: r43458 - head/en_US.ISO8859-1/htdocs/news/status

Thu Jan 9 19:08:07 UTC 2014

Author: pgj
Date: Thu Jan  9 19:08:06 2014
New Revision: 43458
URL: http://svnweb.freebsd.org/changeset/doc/43458

Log:
  - Add a 2013Q4 report entry on ZFS/NFS 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	Thu Jan  9 16:51:55 2014	(r43457)
+++ head/en_US.ISO8859-1/htdocs/news/status/report-2013-10-2013-12.xml	Thu Jan  9 19:08:06 2014	(r43458)
@@ -19,7 +19,7 @@
 
     <!-- XXX: Keep updating the number of entries -->
     <p>Thanks to all the reporters for the excellent work!  This report
-      contains 9 entries and we hope you enjoy reading it.</p>
+      contains 10 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>
@@ -38,6 +38,12 @@
   </category>
 
   <category>
+    <name>kern</name>
+
+    <description>Kernel</description>
+  </category>
+
+  <category>
     <name>arch</name>
 
     <description>Architectures</description>
@@ -498,4 +504,59 @@
 	reports!</task>
     </help>
   </project>
+
+  <project cat='kern'>
+    <title>UMA/ZFS and RPC/NFS Performance Improvements</title>
+
+    <contact>
+      <person>
+	<name>
+	  <given>Alexander</given>
+	  <common>Motin</common>
+	</name>
+	<email>mav at FreeBSD.org</email>
+      </person>
+    </contact>
+
+    <links>
+      <url href="http://docs.freebsd.org/cgi/mid.cgi?52894C92.60905">Discussion of the ZFS/UMA changes</url>
+    </links>
+
+    <body>
+      <p>The performance of ZFS and NFS was suboptimal in &os;, so we
+	have recently investigated some possible improvement paths.  The
+	<tt>uma(9)</tt> memory allocator caching code was improved to
+	adapt better to system memory constraints.  Combined with other
+	virtual memory subsystem improvements done in the previous
+	years, it should be safe to actively use <tt>uma(9)</tt> caches
+	now.  It may be enabled for ZFS to use them for ZIO/ARC via the
+	<tt>vfs.zfs.zio.use_uma</tt> <tt>loader(8)</tt> tunable, which
+	is now the default for amd64, where it is recommended.  Use of
+	<tt>uma(9)</tt> caches for LZ4 compression buffers is
+	unconditionally enabled on all architectures as it is has no
+	serious drawbacks.  On systems with many CPUs, these changes
+	doubled the performance in the benchmarks.</p>
+
+      <p>Several areas of the NFS server stack (RPC, FHA, DRC) got
+	number of fixes and performance optimizations that significantly
+	improves the performance and reduces the CPU usage in number of
+	tests.  Together with the ZFS memory allocator changes mentioned
+	above, it was possible to reach 200K NFS block read IOPS and 55K
+	SPEC NFS IOPS.</p>
+
+      <p>The code was committed to <tt>head</tt>.  The <tt>uma(9)</tt>
+	ZFS commits have been already merged to <tt>stable/10</tt>, and
+	the remainder will be done soon as well.</p>
+
+      <p>The project is sponsored by iXsystems, Inc.</p>
+    </body>
+
+    <help>
+      <task>The SPEC NFS test hits lock congestion on several global
+	locks in the file system layer when a quite intensive
+	<tt>READDIRPLUS</tt> NFS request is received.  Fixing this
+	problem could improve the performance on large systems even
+	further.</task>
+    </help>
+  </project>
 </report>
