From: Walter Hafner <hafner@informatik.tu-muenchen.de> To: Joe Abley <jabley@clear.co.nz> Cc: freebsd-hackers@freebsd.org, hafner@informatik.tu-muenchen.de Subject: Re: IP Type of service (FTP proxy in German c`t) Message-ID: <srj3e2cfph4.fsf@hprbg5.informatik.tu-muenchen.de> In-Reply-To: Joe Abley's message of "Wed, 7 Apr 1999 23:34:46 %2B1200" References: <srj6778g2kb.fsf@hprbg5.informatik.tu-muenchen.de> <19990407233446.A24511@clear.co.nz>
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First of all: A couple of people mailed me directly and told me, that I'm probably the victim of an April fools joke of the c't (The article was in the April's issue). I had the suspection myself, therefore I tested the program before I posted. As you can see below, I really got speed improvements. If this is just coincidence, well, go on, laugh at me. :-) (Ok. You can stop now.) If not, then I see a problem. Joe Abley <jabley@clear.co.nz> writes: > If the intention is to accelerate downloads, then I don't think this > proxy is going to do much. It might promote the treatment of packets outbound > from the client if the rfc1349 precedence is set to 7, but it can have > no control over the return packets -- and that's where all the data is > on a download (which is what most people do). I had a look on 1349, as soon as I read the article. The article states, that "normally" all TOS and precedence settings from incoming packets are simply copied to the outgoing packets (which makes sense). That's the reason I checked the RFC. Unfortunately I didn't find it mentioned. RCF1195 doesn't say much about it either. I can't verify the assumption in detail (I´m no expert), but in a few quick tests I watched this or a similar behaviour: tcsh > ./FTPBooster-linux -Modem:128 -Priority:5 FTPBooster 1.0 1999 c't/Matthias Withopf Bitte geben Sie das Kennwort fuer Stufe 5 - Priority 4 ein. Wie lautet in c't 5/94 das 5. Wort in der vorletzten Zeile der 1. Spalte auf Seite 170? Kennwort: Gestartet auf 127.0.0.1:1414, Uebertragung 128 KBit/s, Stufe 5 - Priority 4... tcsh > setenv ftp_proxy localhost:1414 tcsh > wget -Y off ftp://ftp.distributed.net/pub/rc5-64/current-client/rc5des-freebsd3-x86-elf-nomt.tar.gz ... Connecting to ftp.distributed.net:21... connected! ... 13:28:26 (5.73 KB/s) - `rc5des-freebsd3-x86-elf-nomt.tar.gz' saved [206076] tcsh > wget -Y on ftp://ftp.distributed.net/pub/rc5-64/current-client/rc5des-freebsd3-x86-elf-nomt.tar.gz ... Connecting to localhost:1414... connected! ... 13:30:08 (14.11 KB/s) - `rc5des-freebsd3-x86-elf-nomt.tar.gz.1' saved [206076/206076] From 5 to 14 KB/s ... and that's reproducable, not only for this specific host. I experienced a speedup for some hosts I tested. e.g. ftp.xig.com 4.5 KB/s --> 14 KB/s ftp.sendmail.org 1.9 - 2.3 KB/s --> 2 - 14 KB/s ftp.vix.com 1.5 - 2.8 KB/s --> 5 - 14 KB/s Yes, I downloaded several times (using wget) to get a representative value. I didn't test different providers, router hardware, ftp software etc. The above is really only a quick snapshot. So, the proxy does _something_ and isn't a pure April fools joke. :-) Please don't ask me, why this works, unless you accept the above explanation. > In networks which _do_ support aggregate treatment of packets based on > the rfc1349 precedence or diffserv bits, the usual strategy is to enforce the > setting of these bits on ingress to the provider's network from the customer. > No sane network provider operates on the principle that their customers are > (a) skilled enough or (b) honest enough to set the bits correctly themselves. Unfortunately, I don't think so. Most of the providers are too lazy to configure their routers correctly ("never touch a running system") or simply don't know what they need to to. > Having said that, I don't believe that many significant networks do anything > at all with the rfc1349/diffserv bits further than cisco's alleged special > treatment of precedence-7 traffic which is used for routing protocols. > Concert Internet Plus is a notable exception, but they do ingress policing > and shaping. > > Just my $0.02. I'm not worried about _our_ network :) Well, download the proxy and test for yourself. It runs on FreeBSD 3.1. I _am_ worried. -Walter -- Walter Hafner__________________________________ hafner@in.tum.de <A href=http://www.tum.de/~hafner/>*CLICK*</A>; "Multiple exclamation marks," he went on, shaking his head, "are a sure sign of a diseased mind." (Terry Pratchett, "Eric") To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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