From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 2 Feb 2005 13:31:42 -0800 (PST) From: Christoph Lameter Subject: Re: A scrub daemon (prezeroing) In-Reply-To: <20050202163110.GB23132@logos.cnet> Message-ID: References: <1106828124.19262.45.camel@hades.cambridge.redhat.com> <20050202153256.GA19615@logos.cnet> <20050202163110.GB23132@logos.cnet> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Marcelo Tosatti Cc: David Woodhouse , linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@osdl.org List-ID: On Wed, 2 Feb 2005, Marcelo Tosatti wrote: > > Nope the BTE is a block transfer engine. Its an inter numa node DMA thing > > that is being abused to zero blocks. > Ah, OK. > Is there a driver for normal BTE operation or is not kernel-controlled ? There is a function bte_copy in the ia64 arch. See arch/ia64/sn/kernel/bte.c > I wonder what has to be done to have active DMA engines be abused for zeroing > when idle and what are the implications of that. Some kind of notification mechanism > is necessary to inform idleness ? > > Someone should try implementing the zeroing driver for a fast x86 PCI device. :) Sure but I am on ia64 not i386. Find your own means to abuse your own chips ... ;-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: aart@kvack.org