From owner-svn-src-head@FreeBSD.ORG Mon Jun 3 13:00:33 2013 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 9B10CE87; Mon, 3 Jun 2013 13:00:33 +0000 (UTC) (envelope-from andre@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) by mx1.freebsd.org (Postfix) with ESMTP id 8E25B1BBC; Mon, 3 Jun 2013 13:00:33 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.7/8.14.7) with ESMTP id r53D0XNW092179; Mon, 3 Jun 2013 13:00:33 GMT (envelope-from andre@svn.freebsd.org) Received: (from andre@localhost) by svn.freebsd.org (8.14.7/8.14.5/Submit) id r53D0XUx092178; Mon, 3 Jun 2013 13:00:33 GMT (envelope-from andre@svn.freebsd.org) Message-Id: <201306031300.r53D0XUx092178@svn.freebsd.org> From: Andre Oppermann Date: Mon, 3 Jun 2013 13:00:33 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r251297 - head/sys/dev/xen/netfront X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Jun 2013 13:00:33 -0000 Author: andre Date: Mon Jun 3 13:00:33 2013 New Revision: 251297 URL: http://svnweb.freebsd.org/changeset/base/251297 Log: Specify a maximum TSO length limiting the segment chain to what the Xen host side can handle after defragmentation. This prevents the driver from throwing away too long TSO chains and improves the performance on Amazon AWS instances with 10GigE virtual interfaces to the normally expected throughput. Submitted by: cperciva (earlier version) Reviewed by: cperciva Tested by: cperciva MFC after: 1 week Modified: head/sys/dev/xen/netfront/netfront.c Modified: head/sys/dev/xen/netfront/netfront.c ============================================================================== --- head/sys/dev/xen/netfront/netfront.c Mon Jun 3 12:55:13 2013 (r251296) +++ head/sys/dev/xen/netfront/netfront.c Mon Jun 3 13:00:33 2013 (r251297) @@ -134,6 +134,7 @@ static const int MODPARM_rx_flip = 0; * to mirror the Linux MAX_SKB_FRAGS constant. */ #define MAX_TX_REQ_FRAGS (65536 / PAGE_SIZE + 2) +#define NF_TSO_MAXBURST ((IP_MAXPACKET / PAGE_SIZE) * MCLBYTES) #define RX_COPY_THRESHOLD 256 @@ -2122,6 +2123,7 @@ create_netdev(device_t dev) ifp->if_hwassist = XN_CSUM_FEATURES; ifp->if_capabilities = IFCAP_HWCSUM; + ifp->if_hw_tsomax = NF_TSO_MAXBURST; ether_ifattach(ifp, np->mac); callout_init(&np->xn_stat_ch, CALLOUT_MPSAFE);