From owner-svn-doc-head@freebsd.org Sun Oct 18 22:06:14 2015 Return-Path: Delivered-To: svn-doc-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2B5B5A18477; Sun, 18 Oct 2015 22:06:14 +0000 (UTC) (envelope-from bjk@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id D0AEAD9B; Sun, 18 Oct 2015 22:06:13 +0000 (UTC) (envelope-from bjk@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id t9IM6CWg026006; Sun, 18 Oct 2015 22:06:12 GMT (envelope-from bjk@FreeBSD.org) Received: (from bjk@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id t9IM6CYK026005; Sun, 18 Oct 2015 22:06:12 GMT (envelope-from bjk@FreeBSD.org) Message-Id: <201510182206.t9IM6CYK026005@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: bjk set sender to bjk@FreeBSD.org using -f From: Benjamin Kaduk Date: Sun, 18 Oct 2015 22:06:12 +0000 (UTC) To: doc-committers@freebsd.org, svn-doc-all@freebsd.org, svn-doc-head@freebsd.org Subject: svn commit: r47621 - 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-head@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: SVN commit messages for the doc tree for head List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 18 Oct 2015 22:06:14 -0000 Author: bjk Date: Sun Oct 18 22:06:12 2015 New Revision: 47621 URL: https://svnweb.freebsd.org/changeset/doc/47621 Log: Add automtud report from jmg Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml ============================================================================== --- head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml Sun Oct 18 21:54:09 2015 (r47620) +++ head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml Sun Oct 18 22:06:12 2015 (r47621) @@ -3186,4 +3186,59 @@ + + automtud: Better Jumbo Frame Support + + + + + John-Mark + Gurney + + jmg@FreeBSD.org + + + + + jmgurney/automtud + on github + + + +

The automtud script will allow a &os; machine to send + jumbo frames to machines that support them, while using + normal-sized frames for other machines.

+ +

There are various advantages to using jumbo frames, + such as reduced protocol overhead. It also means that TCP streams + will not be segmented as much (though TSO helps mitigate the + disadvantages of such segmentation) and in cases where LRO does + not work well, fewer packets will be received.

+ +

The script currently does not restore the system to its + original state when it exits. This means that you will have to + manually change the interface MTU and manually delete host routes + after stopping the script. +

+ + + + +

Fix up various ethernet drivers to better support jumbo frames. + Most ethernet drivers, though they support scatter/gather, use a + physically contiguous zone to do so, which can cause resource + shortages.

+ + + +

More testing is needed to ensure that things behave as + expected. This means that when running the script, communication + to all machines functions normanlly, without slowdown or + connectivity issues. Check `vmstat -z | grep mbuf' to ensure that + such issues are not due to running out of jumbo_9k or jumbo_16k + buffers due to ethernet driver issue.

+ + + +