Date: Sat, 27 Apr 2002 23:26:00 -0700 From: Luigi Rizzo <rizzo@icir.org> To: Marcelo Carvalho <marcelomcarvalho@yahoo.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Clock granularity, dummynet & netperf Message-ID: <20020427232600.E63189@iguana.icir.org> In-Reply-To: <20020427224315.64485.qmail@web14402.mail.yahoo.com> References: <20020427224315.64485.qmail@web14402.mail.yahoo.com>
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On Sat, Apr 27, 2002 at 03:43:15PM -0700, Marcelo Carvalho wrote: ... > According to my first results (even a simple ping > shows it), the delays are not properly set by > dummynet. Ok, the HZ option is set initially to 100. actually you should give a more detailed description of what goes wrong or it is impossible to comment what you are seeing. same for netperf. cheers luigi > Following Luigi's recommendations, I've increased HZ > to 1000. It turns out that I'm now getting > segmentation faults when I run netperf! > > I've tried to play around with the quantum clock as > well without success... I've increased it and the > measurements get really wild, totally inconsistent. > > I've read Luigi's previous message about the impact > on select() behavior on softwares that are not aware > of this. So, considering that so many people have > played around with the HZ option and could perform > measurements without no problem, is there a patch to > netperf that overcomes this problem or a better > software for performance evaluation as good (or > better) than netperf??? > > In case not, is anybody here familiar with this > problem and has fixed it in the past? I would really > appreciate any help, comments, etc. > > Thanks, > Marcelo. > > > > > > __________________________________________________ > Do You Yahoo!? > Yahoo! Health - your guide to health and wellness > http://health.yahoo.com > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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