Date: Fri, 01 Feb 2002 01:47:01 +0100 From: Marko Zec <zec@tel.fer.hr> To: Storms of Perfection <gary@outloud.org> Cc: mjm@michaelmeltzer.com, silby@silby.com, thierry@herbelot.com, replicator@ngs.ru, hackers@FreeBSD.ORG Subject: Re: Clock Granularity (kernel option HZ) Message-ID: <3C59E584.1F320CF8@tel.fer.hr> References: <005b01c1aaaf$e38ecd70$34f820c0@ix1x1000> <3503.208.141.46.249.1012522251.squirrel@test.outloud.org>
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Storms of Perfection wrote: > Ok. Since I have a limited hardware/software set at my finger tips. I can > generate an attack on my machine (such as a synflood or something) to see > what type of reponses I can get by setting it up and down. I think this may > apply to this feature, to help the machine withstand attacks (and possibly > have performance related gains/decreases) Under no circumstances can increasing HZ make the machine less vulnerable to high packet-rate traffic. In fact, it will performe even slightly worse. Try using interrupt coalescing instead (on cards that support it), or even better, try Luigi's polling code. Marko To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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