Date: Tue, 21 Feb 2006 06:35:33 -0800 From: Luigi Rizzo <rizzo@icir.org> To: Donald Baud <donaldbaud@yahoo.com> Cc: freebsd-ipfw@freebsd.org Subject: Re: Patch to add burst to dummynet ? Message-ID: <20060221063533.A63214@xorpc.icir.org> In-Reply-To: <20060221141201.44390.qmail@web37406.mail.mud.yahoo.com>; from donaldbaud@yahoo.com on Tue, Feb 21, 2006 at 06:12:01AM -0800 References: <20060221141201.44390.qmail@web37406.mail.mud.yahoo.com>
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On Tue, Feb 21, 2006 at 06:12:01AM -0800, Donald Baud wrote: > Looking back in the mailing archives http://docs.freebsd.org/cgi/getmsg.cgi?fetch=62536+0+archive/2003/freebsd-ipfw/20030907.freebsd-ipfw , I found a message saying that it would be trivial to add burst support in dummynet. > In that message, it says to change in ip_dummynet.c : > > - if (len_scaled > q->numbytes ) > + if (len_scaled > q->numbytes + q->burst_size) > > I did that, even tried len_scaled = 0 > But I don't see any difference after recompiling, kldunload/kldload dummynet. > > I still get the same throughput with wget --progress=dot some_file of course you get the same throughput! the burst is just a constant in the time it takes to transfer data, and it is independent of the data size. irrespective of the file size you'll just finish (burst_size/bandwidth) seconds earlier. cheers luigi
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