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Date:      Fri, 1 Feb 2002 00:23:39 -0800
From:      Luigi Rizzo <rizzo@icir.org>
To:        Terry Lambert <tlambert2@mindspring.com>
Cc:        Mike Silbersack <silby@silby.com>, Storms of Perfection <gary@outloud.org>, thierry@herbelot.com, replicator@ngs.ru, hackers@FreeBSD.org
Subject:   Re: Clock Granularity (kernel option HZ)
Message-ID:  <20020201002339.C48439@iguana.icir.org>
In-Reply-To: <3C59E873.4E8A82B5@mindspring.com>
References:  <20020131172729.X38382-100000@patrocles.silby.com> <3C59E873.4E8A82B5@mindspring.com>

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On Thu, Jan 31, 2002 at 04:59:31PM -0800, Terry Lambert wrote:
> 
> You will get a factor of 6 (approximately) improvement in
> throughput vs. overhead if you process packets to completion
> at interrupt, and process writes to completion at write time
> from the process.

this does not match my numbers. e.g. using "fastforwarding"
(which bypasses netisrs's) improves peak throughput
by a factor between 1.2 and 2 on our test boxes.

	cheers
	luigi

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