Re: [LARTC] Shaping incoming VoIP traffic fails
On 11/15/06, Daniel Musketa [EMAIL PROTECTED] wrote: On Wednesday 15 November 2006 12:07, Daniel Musketa wrote: Could I setup HTB better than below? Should I reduce eth1's queue length (now 1000)? If yes, how? The txqueuelen can be changed by ip link set eth1 txqlen len I tried values of 100 and 3 but can't hear an improvement. I can watch traffic coming in on ppp0 with `iftop` and it never exeeds 900kbit. Why could a 2000kbit headroom be not enough for clean receiving of 80kbit VoIP data? Because you are not on the controlling side. The router upstream of you doesn't have the concept of priority of the voip traffic so what comes first, goes out first. Also if the download side can send at a higher rate than you line can handle, there will be a queue of packets at the router handling the bandwidth limititation. ___ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
Re: [LARTC] Shaping incoming VoIP traffic fails
Am Donnerstag, 16. November 2006 17:37 schrieb Larry Brigman: On 11/15/06, Daniel Musketa [EMAIL PROTECTED] wrote: I can watch traffic coming in on ppp0 with `iftop` and it never exeeds 900kbit. Why could a 2000kbit headroom be not enough for clean receiving of 80kbit VoIP data? Because [...] what comes first, goes out first. Also if the download side can send at a higher rate than you line can handle, there will be a queue of packets at the router handling the bandwidth limititation. `iftop` shows me a rate of 800kbit for packets going out to the LAN on eth1. This is the ceil value for egress shaping from router to LAN. But I also can watch the download rate of packets coming in from ppp0. And it's never more than 900kbit, so TCP's mechanism of lowering TX speed after delayed/missing ACKs seems to work. To me it looks as if there wasn't a filled queue on the ISP's side of the line. `tc -s ...` shows me a backlog of about 20p in the download class. I still can't understand why more than 2 Mbit free bandwith and an empty queue can cause drop outs ... mmh ... Daniel ___ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
Re: [LARTC] Shaping incoming VoIP traffic fails
On Wednesday 15 November 2006 12:07, Daniel Musketa wrote: Could I setup HTB better than below? Should I reduce eth1's queue length (now 1000)? If yes, how? The txqueuelen can be changed by ip link set eth1 txqlen len I tried values of 100 and 3 but can't hear an improvement. I can watch traffic coming in on ppp0 with `iftop` and it never exeeds 900kbit. Why could a 2000kbit headroom be not enough for clean receiving of 80kbit VoIP data? Daniel ___ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
