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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!


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