Re: Congestion control as a hot topic in IETF
Jon Crowcroft <[email protected]>
| Newsgroups | gmane.network.end2end |
|---|---|
| Message-ID | <[email protected]> |
hunh? a wire is just a channel no different from free space except for interference and possibly slower than speed of light RF propagation, and, depending on technology, lower interference and lower path loss the channel is irrelevant to this discusson, except that a wireless channel may be shared so you can see contention for the receive antennae (some people talk about contention for the media too, but that's a figment of the technology of choice for MAC)... so i have no idea where you think packets are stored except in senders' and receivers' NICs' buffers.... you need to haev a REALLY long haul link to get a lot of packets in transit (propagation) - these are unusual cases (satellites) basically (comms #101) - you have the packet serialisation time (s=clock speed*packet length) and you have the packet propagation time (p=link geodistance / c) so the case of packets in transit is plural, is when p/s > 1 which is not too many cases... anyhow that's not what congestion or contention are about In missive <[email protected]>, Detlef Bosau typed: >>Am 07.03.2013 23:02, schrieb Jon Crowcroft: >>> >>> What has the wireless link got to do with it? The same is true of a >>> wire. The contention is for shared media, or shared buffer. >>Hm. Does a wired link always keep only one packet or less? ;-) >>This is the difference here: The capacity. not really. >> >>-- >>------------------------------------------------------------------ >>Detlef Bosau >>Galileistraße 30 >>70565 Stuttgart Tel.: +49 711 5208031 >> mobile: +49 172 6819937 >> skype: detlef.bosau >> ICQ: 566129673 >>[email protected] http://www.detlef-bosau.de >> >> >>--------------070804030003020405080909 >>Content-Type: text/html; charset=ISO-8859-1 >>Content-Transfer-Encoding: 7bit >> >><html> >> <head> >> <meta content="text/html; charset=ISO-8859-1" >> http-equiv="Content-Type"> >> </head> >> <body bgcolor="#FFFFFF" text="#000000"> >> <div class="moz-cite-prefix">Am 07.03.2013 23:02, schrieb Jon >> Crowcroft:<br> >> </div> >> <blockquote >>cite="mid:CAEeTejKADW=djTrj=H3hGEfYo62B2R3KvHgCM_m3W9JeaPSGhw@mail.gmail.com" >> type="cite"> >> <meta http-equiv="Context-Type" content="text/html; >> charset=ISO-8859-1"> >> <p>What has the wireless link got to do with it? The same is true >> of a wire. The contention is for shared media, or shared buffer.</p> >> </blockquote> >> <br> >> Hm. Does a wired link always keep only one packet or less? <span >> class="moz-smiley-s3"><span> ;-) </span></span><br> >> <br> >> This is the difference here: The capacity.<br> >> <pre class="moz-signature" cols="72">-- >>------------------------------------------------------------------ >>Detlef Bosau >>Galileistraße 30 >>70565 Stuttgart Tel.: +49 711 5208031 >> mobile: +49 172 6819937 >> skype: detlef.bosau >> ICQ: 566129673 >><a class="moz-txt-link-abbreviated" href="mailto:[email protected]">[email protected]</a> <a class="moz-txt-link-freetext" href="http://www.detlef-bosau.de">http://www.detlef-bosau.de</a> >> >></pre> >> </body> >></html> >> >>--------------070804030003020405080909-- cheers jon