Date: Tue, 21 Feb 2006 06:57:10 -0800 (PST) From: Donald Baud <donaldbaud@yahoo.com> To: Luigi Rizzo <rizzo@icir.org> Cc: freebsd-ipfw@freebsd.org Subject: Re: Patch to add burst to dummynet ? Message-ID: <20060221145710.66863.qmail@web37406.mail.mud.yahoo.com> In-Reply-To: <20060221063533.A63214@xorpc.icir.org>
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--- Luigi Rizzo <rizzo@icir.org> wrote: > 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 I ran two tests with the following ipfw rules: ipfw pipe 10 config bw 10kbit/s ipfw add 5 pipe 10 ip from 10.0.0.1 to me == with: if (len_scaled > q->numbytes) == wget --progress=dot some_file 0K .......... .......... 0% 1.13 KB/s 50K .......... .......... 1% 1.14 KB/s 100K .......... .......... 2% 1.14 KB/s 150K .......... .......... 3% 1.14 KB/s == with: if (len_scaled > q->numbytes + 100000 ) wget --progress=dot some_file 0K .......... .......... 0% 1.13 KB/s 50K .......... .......... 1% 1.14 KB/s 100K .......... .......... 2% 1.14 KB/s 150K .......... .......... 3% 1.14 KB/s __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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