From owner-freebsd-current Mon Mar 20 12:47:36 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 574D037C73D; Mon, 20 Mar 2000 12:33:37 -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 VAA20473; Mon, 20 Mar 2000 21:33:13 +0100 (CET) (envelope-from phk@critter.freebsd.dk) To: Alfred Perlstein Cc: Matthew Dillon , current@FreeBSD.ORG, bde@FreeBSD.ORG Subject: Re: I/O clustering, Re: patches for test / review In-reply-to: Your message of "Mon, 20 Mar 2000 12:53:17 PST." <20000320125317.E14789@fw.wintelcom.net> Date: Mon, 20 Mar 2000 21:33:13 +0100 Message-ID: <20471.953584393@critter.freebsd.dk> From: Poul-Henning Kamp Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <20000320125317.E14789@fw.wintelcom.net>, Alfred Perlstein writes: >> >> Before we redesign the clustering, I would like to know if we >> >> actually have any recent benchmarks which prove that clustering >> >> is overall beneficial ? >> > >> >Yes it is really benificial. >> >> I would like to see some numbers if you have them. > >No I don't have numbers. > >Committing a 64k block would require 8 times the overhead of bundling >up the RPC as well as transmission and reply, it may be possible >to pipeline these commits because you don't really need to wait >for one to complete before issueing another request, but it's still >8x the amount of traffic. I agree that it is obvious for NFS, but I don't see it as being obvious at all for (modern) disks, so for that case I would like to see numbers. If running without clustering is just as fast for modern disks, I think the clustering needs rethought. -- 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