Date: Sun, 6 Oct 2013 08:58:27 +0000 (UTC) From: Gabor Pali <pgj@FreeBSD.org> To: doc-committers@freebsd.org, svn-doc-all@freebsd.org, svn-doc-head@freebsd.org Subject: svn commit: r42864 - head/en_US.ISO8859-1/htdocs/news/status Message-ID: <201310060858.r968wRom016417@svn.freebsd.org>
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Author: pgj Date: Sun Oct 6 08:58:26 2013 New Revision: 42864 URL: http://svnweb.freebsd.org/changeset/doc/42864 Log: - Add Q3 report on ARM superpages Submitted by: zbb Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2013-07-2013-09.xml Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2013-07-2013-09.xml ============================================================================== --- head/en_US.ISO8859-1/htdocs/news/status/report-2013-07-2013-09.xml Sun Oct 6 08:41:37 2013 (r42863) +++ head/en_US.ISO8859-1/htdocs/news/status/report-2013-07-2013-09.xml Sun Oct 6 08:58:26 2013 (r42864) @@ -19,7 +19,7 @@ <!-- XXX: keep updating the number of entries --> <p>Thanks to all the reporters for the excellent work! This report - contains 13 entries and we hope you enjoy reading it.</p> + contains 14 entries and we hope you enjoy reading it.</p> <!-- XXX: set date for the next set of submissions --> <p>The deadline for submissions covering between October and @@ -666,4 +666,99 @@ </ul> </body> </project> + + <project cat='arch'> + <title>Superpages for ARMv7</title> + + <contact> + <person> + <name> + <given>Zbigniew</given> + <common>Bodek</common> + </name> + <email>zbb@semihalf.com</email> + </person> + + <person> + <name> + <given>Grzegorz</given> + <common>Bernacki</common> + </name> + <email>gjb@semihalf.com</email> + </person> + + <person> + <name> + <given>Rafał</given> + <common>Jaworowski</common> + </name> + <email>raj@semihalf.com</email> + </person> + </contact> + + <links> + <url href="http://static.usenix.org/events/osdi02/tech/full_papers/navarro/navarro.pdf" /> + <url href="http://wiki.freebsd.org/ARMSuperpages" /> + <url href="http://blogs.arm.com/software-enablement/1079-transparent-superpages-for-freebsd-on-arm" /> + <url href="https://wiki.freebsd.org/201309DevSummit?action=AttachFile&do=view&target=semihalf-superpages_armv7.pdf" /> + <url href="http://svnweb.freebsd.org/changeset/base/254918" /> + </links> + + <body> + <p>The ARM architecture is becoming more and more prevalent, with + increasing usage beyond the mobile and embedded space. Among the + more interesting industry trends emerging in the recent months, + there has been the concept of "ARM server". Some top-tier + companies, e.g. Dell and HP, have already started to develop + such systems.</p> + + <p>Key to success of &os; in these new areas is dealing with the + sophisticated features of the platform, for example adding + support for superpages.</p> + + <p>The objective of this project is to enable &os;/arm to utilize + superpages which would allow efficient use of TLB translations + (by enlarging TLB coverage), leading to improved performance in + many applications and scalability. This is intended to work on + ARMv7-based processors, however compatibility with ARMv6 will be + preserved.</p> + + <p>The following steps have been made since the last status + report:</p> + + <ul> + <li>The <tt>pmap</tt> module has been adjusted to fully utilize + superpages.</li> + + <li>Found and fixed minor bugs in superpage management.</li> + + <li>Implemented the <tt>pmap_advise()</tt> routine.</li> + + <li>Performed extensive testing and benchmarking: + + <ul> + <li>Giga Updates Per Second (GUPS) benchmark: 34% lower memory access + latency and 34% higher updates ratio.</li> + + <li>LMbench: 38% lower memory latency.</li> + + <li>Self-hosted <tt>buildworld</tt>: 20% shorter, using GCC.</li> + </ul></li> + + <li>Final integration into &os; <tt>head</tt>.</li> + </ul> + + <p>This project is jointly sponsored by The &os; Foundation and + Semihalf.</p> + </body> + + <help> + <task>Adjust <tt>pmap</tt> to resolve the demotion issue caused by + the continuous active queue scanning in VM.</task> + + <task>Support for 64KB page size.</task> + + <task>Move <tt>pv_flags</tt> to page table entry descriptors.</task> + </help> + </project> </report>
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