From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Furniss Date: Sat, 19 Mar 2005 11:53:37 +0000 Subject: Re: [LARTC] strange behaviour of qos Message-Id: <423C12C1.4050408@dsl.pipex.com> List-Id: References: <42319DC2.80500@post.pl> In-Reply-To: <42319DC2.80500@post.pl> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org Ratel wrote: > Ed Wildgoose wrote: > >> >>> >>> any idea what might be wrong ? >> >> >> >> >> Yep, something is queuing somewhere... >> >> Either your outbound setup allows too much outbound for the outbound >> connection (and if you use ADSL remember packets use more bandwidth >> than on ethernet). Or you aren't throttling your inbound connection >> enough and queuing is occuring on the ISP end of your link >> >> Ed W >> > No, I really don't think so. The link itself is a 100%-CIR SDSL (for > LANof 300+ machines). I've > set up ceil(up and down) to ~95% of real bandwidth. That may be OK as long as CIR is at ip level not atm/aal5 also if you use older tc k means 1024. In the case if ingress traffic - even if you set 95% and it really is 95% then you need to back off a bit as the traffic has already been shaped by the link and at 95% you are only going to queue 5 packets for every hundred that pass - which means tcp bursts can fill and maybe drop from the buffer at the other end - hurting latency and if dropping - your bandwidth allocation. > It seems that classes exceed maximum rates (ceils) defined for them. > For example : p2p class has ceil of 2.5 mbits > When p2p traffic is not allowed to pass through bandwidth usage varies > around 30%. > Afrer allowing p2p to pass bandwidth usage quickly rises to nearly 100%. > Is it possible to somehow isolate a class (as in cbq?) ?. In the > archives I've > found something like this (let's say): '[...] rate 2500kbit ceil > 2500kbit'. This should > produce something like isolated class , but for me it simply doesn't work. > I'd be very grateful for any suggestions / ideas ... > > Ratel > > _______________________________________________ > LARTC mailing list > LARTC@mailman.ds9a.nl > http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc > _______________________________________________ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc