Il sab, 2000-11-18 alle 07:15, Dan Maas ha scritto: > I run a small Linux webserver and NAT router from my cable modem at home. > Whenever someone starts an http download, all other traffic from my LAN is > starved. Bandwidth is not really an issue, but latency is particularly > horrible -- pings that usually come back in 20ms can take up to 600ms while > the web server is active! > > I set up QoS (netfilter+iproute2) on the NAT machine in an attempt to give > priority to non-web traffic. At first I tried the "prio" packet scheduler, > which maintains three outgoing queues. I put everything but web traffic in > queue zero, and the http packets in queue two (the scheduler will only > transmit packets from a queue if the lower queues are empty, thus giving > precedence to the lower-numbered queues). I verified using printk's in the > kernel modules that packets were indeed being prioritized and queued in the > manner I describe. > > HOWEVER, this QoS setup does not reduce my latency problems at all!! Despite > the packet prioritization, pings still shoot up into the 500ms range and UDP > round-trip latency still becomes awful during a long http upload. > > Was I wrong in assuming that priority-band scheduling would fix my problem? > I looked at using full CBQ, but I have no idea what options would be correct > for my setup. Does anyone else have experience with solving problems like > this? I just wish I could see the same 20ms pings even during a modest > amount of web traffic... > > Many thanks, > Dan > > I have just read this message (of 2 years ago...) and I have the same problem: I have a similar setup (I have used prio and htb) and when link is full latency of classes with high priority raise from 200 to 2000ms. In htb tutorial it show that latency of classes with prio 0 goes down. Using prio does not work. Is there something missing? -- Mario Giammarco Via Calamandrei,5-48022 Lugo (RA) ITALY tel: +39054522965 cell: +39(0)3284146845 mgiammarco@galactica.it mgiammarco@libero.it giammarc@cs.unibo.it - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
