Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 19 Oct 2001 17:24:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 19 Oct 2001 17:23:51 -0400 Received: from msgbas1x.cos.agilent.com ([192.25.240.36]:56564 "HELO msgbas1.cos.agilent.com") by vger.kernel.org with SMTP id ; Fri, 19 Oct 2001 17:23:43 -0400 Message-ID: <01A7DAF31F93D511AEE300D0B706ED9208E4A5@axcs13.cos.agilent.com> From: "MEHTA,HIREN (A-SanJose,ex1)" To: "'Ralf Baechle'" , "MEHTA,HIREN (A-SanJose,ex1)" Cc: "'linux-kernel@vger.kernel.org'" Subject: RE: pci_alloc_consistent question Date: Fri, 19 Oct 2001 15:24:14 -0600 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org so, what is the conservative number ? 1MB ? -hiren -----Original Message----- From: Ralf Baechle [mailto:ralf@uni-koblenz.de] Sent: Friday, October 19, 2001 1:58 PM To: MEHTA,HIREN (A-SanJose,ex1) Cc: 'linux-kernel@vger.kernel.org' Subject: Re: pci_alloc_consistent question On Fri, Oct 19, 2001 at 12:32:19PM -0600, MEHTA,HIREN (A-SanJose,ex1) wrote: > Is there any limitation on the amount of contiguous dmaable memory that > can be allocated using a single call to pci_alloc_consistent() ? Entirely platform dependant. On some systems the total available DMA memory for DMA may be as limited as 1mb, others have limits like 16mb yet other can support the entire 32-bit address space for DMA. So in case of doubt be conservative. Ralf - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/