From owner-svn-src-all@FreeBSD.ORG Fri Jun 11 18:54:07 2010 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 97B261065675; Fri, 11 Jun 2010 18:54:07 +0000 (UTC) (envelope-from pyunyh@gmail.com) Received: from mail-pw0-f54.google.com (mail-pw0-f54.google.com [209.85.160.54]) by mx1.freebsd.org (Postfix) with ESMTP id 4B5588FC1B; Fri, 11 Jun 2010 18:54:07 +0000 (UTC) Received: by pwj1 with SMTP id 1so998773pwj.13 for ; Fri, 11 Jun 2010 11:54:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:received:from:date:to:cc :subject:message-id:reply-to:references:mime-version:content-type :content-disposition:in-reply-to:user-agent; bh=0qi6xuEgjTInUejR2ChjcWy6HSTEan/QNfnH92TVI1I=; b=DP8Y2J/XZ8QxWQWuhfJRJkO632Uu9VPc/Re6squGanw7fKpqUmPSOWGuhGEG5k7ADG nLuYB9iT039SH6FE/mFKcqgmsc1byNy0NxxqxM3SgrXkZerf/4DCeKancbxEiw7RhZ89 pl1S4jQHf3nI2s69uc4ptVdP1aEWmpnpGAP4s= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:date:to:cc:subject:message-id:reply-to:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=iulmqlk50+I1M4XRME+cNV1Q1fyvFhsTl6c3U8dL2aPmg0yLLRppO/uKQBuaqRmedD skQjiG2t+qyHcAvu6IiFAscGrW8faYuuwbHwY286gAONxCv6IGppYf6KvAdCTJd2K980 CNwAEATRiTjNkUROZpk7oCqi2nZFBpLv5Jx54= Received: by 10.141.108.21 with SMTP id k21mr1715007rvm.170.1276282446828; Fri, 11 Jun 2010 11:54:06 -0700 (PDT) Received: from pyunyh@gmail.com ([174.35.1.224]) by mx.google.com with ESMTPS id r23sm1486238rvq.0.2010.06.11.11.54.05 (version=TLSv1/SSLv3 cipher=RC4-MD5); Fri, 11 Jun 2010 11:54:06 -0700 (PDT) Received: by pyunyh@gmail.com (sSMTP sendmail emulation); Fri, 11 Jun 2010 11:52:45 -0700 From: Pyun YongHyeon Date: Fri, 11 Jun 2010 11:52:45 -0700 To: Marcel Moolenaar Message-ID: <20100611185245.GK13776@michelle.cdnetworks.com> References: <19B0DF11-5998-40F5-8095-8D2521B1C597@mac.com> <291D17F7-F387-4A13-8ED9-2898A9F7E018@mac.com> <028BA7D4-90C8-4D2D-B9A5-C1C3CF9B6D7D@samsco.org> <20100611174137.GC13776@michelle.cdnetworks.com> <9F065122-7D91-42E9-A251-5AF4AAF0B4E5@samsco.org> <20100611175016.GD13776@michelle.cdnetworks.com> <59E450BB-1E79-440E-AF82-B78E1E8FE334@mac.com> <20100611180824.GG13776@michelle.cdnetworks.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i Cc: svn-src-head@freebsd.org, Scott Long , src-committers@freebsd.org, svn-src-all@freebsd.org, John Baldwin Subject: Re: svn commit: r209026 - in head/sys/ia64: ia64 include X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: pyunyh@gmail.com List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Jun 2010 18:54:07 -0000 On Fri, Jun 11, 2010 at 11:49:14AM -0700, Marcel Moolenaar wrote: > > On Jun 11, 2010, at 11:08 AM, Pyun YongHyeon wrote: > > > On Fri, Jun 11, 2010 at 11:06:06AM -0700, Marcel Moolenaar wrote: > >> > >> On Jun 11, 2010, at 10:50 AM, Pyun YongHyeon wrote: > >> > >>>>>> > >>>>>> I'm not clear why you even need bounce buffers for RX. The chip supports 64bit addresses with no boundary or alignment restrictions. > >>>>>> > >>>>> > >>>>> Some controllers have 4G boundary bug so bge(4) restricts dma > >>>>> address space. > >>>> > >>>> That limitation should be reflected in the boundary attribute of the tag, not the lowaddr/highaddr attributes. > >>>> > >>> > >>> Yes, but that needed more code. And I don't have these buggy > >>> controllers so I chose more simple way that would work even though > >>> it may be inefficient. > >> > >> Do you happen to know if one or both of the hardware I have access to > >> is the "buggy" hardware? > >> > > > > Yes, both devices below can not handle 4GB boundary crossing in DMA > > state machine. > > Thanks. I'll keep that in mind. If I have a few cycles I'll patch the > kernel to allow 64-bit DMA addresses with a 4G boundary restriction > and run that through stress2. > I'll let you know when I have a patch to try on your box. I'm not sure when that could be done though. > -- > Marcel Moolenaar > xcllnt@mac.com > > >