From owner-svn-doc-all@FreeBSD.ORG Sat Jan 11 10:29:53 2014 Return-Path: Delivered-To: svn-doc-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 404192FE; Sat, 11 Jan 2014 10:29:53 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 1C36215D2; Sat, 11 Jan 2014 10:29:53 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.7/8.14.7) with ESMTP id s0BATq54098096; Sat, 11 Jan 2014 10:29:52 GMT (envelope-from pgj@svn.freebsd.org) Received: (from pgj@localhost) by svn.freebsd.org (8.14.7/8.14.7/Submit) id s0BATqFk098095; Sat, 11 Jan 2014 10:29:52 GMT (envelope-from pgj@svn.freebsd.org) Message-Id: <201401111029.s0BATqFk098095@svn.freebsd.org> From: Gabor Pali Date: Sat, 11 Jan 2014 10:29:52 +0000 (UTC) To: doc-committers@freebsd.org, svn-doc-all@freebsd.org, svn-doc-head@freebsd.org Subject: svn commit: r43470 - head/en_US.ISO8859-1/htdocs/news/status X-SVN-Group: doc-head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-doc-all@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "SVN commit messages for the entire doc trees \(except for " user" , " projects" , and " translations" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 11 Jan 2014 10:29:53 -0000 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 @@

Thanks to all the reporters for the excellent work! This report - contains 10 entries and we hope you enjoy reading it.

+ contains 11 entries and we hope you enjoy reading it.

The deadline for submissions covering between January and March 2014 is April 7th, 2014.

@@ -559,4 +559,53 @@ further. + + + GEOM Direct Dispatch and Fine-Grained CAM Locking + + + + + Alexander + Motin + + mav@FreeBSD.org + + + + + Slides from EuroBSDCon 2013, also describing this project + CAM improvements in the stable/10 branch + GEOM improvements in the stable/10 branch + + + +

The CAM and GEOM multi-processor scalability improvement + project has completed. The corresponding code has been committed + to &os; head and recently merged to the + stable/10 branch, it shall appear in + 10.1-RELEASE.

+ +

As part of this project, cam(4) (ATA/SCSI subsystem) + has received more fine-grained locking for better utilization of + multi-core systems. In addition, locking in geom(4) + (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.

+ +

Thanks to these cam(4) and geom(4) changes, + the peak I/O rate has doubled on comptemporary hardware, reaching + up to 1,000,000 IOPS!

+ +

The project was sponsored by iXsystems, Inc.

+ + + + 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. + +