From owner-freebsd-current Fri Mar 24 1:46:30 2000 Delivered-To: freebsd-current@freebsd.org Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.40.131]) by hub.freebsd.org (Postfix) with ESMTP id 4FE5037B54F for ; Fri, 24 Mar 2000 01:46:25 -0800 (PST) (envelope-from phk@critter.freebsd.dk) Received: from critter.freebsd.dk (localhost.freebsd.dk [127.0.0.1]) by critter.freebsd.dk (8.9.3/8.9.3) with ESMTP id KAA02236; Fri, 24 Mar 2000 10:45:55 +0100 (CET) (envelope-from phk@critter.freebsd.dk) To: Greg Lehey Cc: Alfred Perlstein , Matthew Dillon , current@FreeBSD.ORG Subject: Re: patches for test / review In-reply-to: Your message of "Thu, 23 Mar 2000 15:28:10 PST." <20000323152810.D9318@mojave.worldwide.lemis.com> Date: Fri, 24 Mar 2000 10:45:55 +0100 Message-ID: <2234.953891155@critter.freebsd.dk> From: Poul-Henning Kamp Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <20000323152810.D9318@mojave.worldwide.lemis.com>, Greg Lehey writes : >> Hmm, try to keep vinum/RAID5 in the picture when you look at this >> code, it complicated matters a lot. > >I don't think it's that relevant, in fact. Yes it is, because the CPU needs to read the buffers to calculate the parity, it cannot just DMA the data out into hardware like a scsi controller can do. -- Poul-Henning Kamp FreeBSD coreteam member phk@FreeBSD.ORG "Real hackers run -current on their laptop." FreeBSD -- It will take a long time before progress goes too far! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message