From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: pv-ops domU not working with MSI interrupts on Nehalem Date: Thu, 14 Oct 2010 09:57:09 -0400 Message-ID: <20101014135709.GA2727@dumpdata.com> References: <20101001211111.GA18244@dumpdata.com> <20101011214605.GA18201@dumpdata.com> <20101013214613.GA7153@dumpdata.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Bruce Edge Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org > >> You can't use SG buffers? And chain them together and provide them > >> to the device? A lot of other drivers do this ... > > > > Perhaps. I don't know. I'm not the driver author. I think that it > > worked using 1 giant buffer before so there was no need to use SG > > buffers. > > Got some more info. It's a hardware requirement for the tachyon chip. > It uses a 2 MB block for the FC SEST index table. It's one place where > we can't use SG. OK, pci_alloc_consistent is the way. I think you can go up to 2MB with it. > It really not a matter of laziness.