Date: Mon, 20 Mar 2000 21:33:13 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Alfred Perlstein <bright@wintelcom.net> Cc: Matthew Dillon <dillon@apollo.backplane.com>, current@FreeBSD.ORG, bde@FreeBSD.ORG Subject: Re: I/O clustering, Re: patches for test / review Message-ID: <20471.953584393@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 20 Mar 2000 12:53:17 PST." <20000320125317.E14789@fw.wintelcom.net>
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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
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