Date: Tue, 26 Oct 1999 17:35:24 -0700 From: jayanth <jayanth@yahoo-inc.com> To: Alex Rousskov <rousskov@ircache.net> Cc: freebsd-net@FreeBSD.ORG Subject: Re: TCP throughput vs number of aliases Message-ID: <381648CC.B57E06BF@yahoo-inc.com> References: <Pine.BSF.4.05.9910261734440.48725-100000@pail.ircache.net>
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Alex Rousskov wrote: > Hi there, > > We use FreeBSD 3.1 to benchmark Web caching proxies. We want to > use a [very] large number of IP addresses for simulated clients and > servers in the benchmark setup. However, we are limited by the number of > machines we can dedicate to the tests. Naturally, we are using interface > aliases to create IP addresses. > > With the number of aliases above 600+ we are monitoring a sudden > and significant drop in TCP throughput (measured using simple netperf > tests). The graph and some details of the setup are at > > http://www.ircache.net/~wessels/Junk/aliases/ > > We would like to use more than 600 aliases; probably 2,000-5,000 aliases > per box without the loss of performance. > > Can anybody recommend a solution? > > Thank you, > > Alex. > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message The code in ip_input.c seems to step through the list of all ip addresses for that interface. It is probably stepping thro' all the alias addresses I wonder if that is the problem. jayanth To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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