Date: Wed, 04 Mar 2009 22:05:53 +0100 From: Sebastian Mellmann <sebastian.mellmann@net.t-labs.tu-berlin.de> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: freebsd-ipfw@freebsd.org Subject: Re: ipfw (dummynet) adds delay, but not configured to do so Message-ID: <49AEED31.8060801@net.t-labs.tu-berlin.de> In-Reply-To: <20090304210017.GA29615@onelab2.iet.unipi.it> References: <49AED3B1.1060209@net.t-labs.tu-berlin.de> <20090304210017.GA29615@onelab2.iet.unipi.it>
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> On Wed, Mar 04, 2009 at 08:17:05PM +0100, Sebastian Mellmann wrote: > >> Hi everyone! >> >> I hope this is the right place to ask. >> >> I've got a IPFW ruleset that looks like this: >> >> cmd=ipfw >> bottleneck_bandwidth=100Mbit/s >> in_if="em0" >> >> $cmd pipe 500 config bw $bottleneck_bandwidth >> $cmd add pipe 500 all from any to any via $in_if >> > > the delay that a packet experiences corresponds to len/bandwidth, > often rounded up to the next clock tick (1ms is the default). > You get one delay inbound, one delay outbound, so that's 2ms. > > Is there any chance to change this clock tick to a lower value? I think it's the 'HZ=' option in the kernel config isn't it? > cheers > luigi > Regards, Sebastian
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