On Mon, 8 Jul 2002, Dmitriy wrote: > Can anybody tell me: is there any way(module, qdisc) which is possible to > make a packet wait for a fixed time then dequeue? It is needed for me to > get a fixed RTT. Using htb,tbf... I can get only total speed limitations > but then a queue is empty rtt of small ICMP packets is smth like 200-300 > usec. Will be thankful for any info.(Note: I`d like to make this thing > using only Linux tc). Just a random thought but dont know if this is doable. If it is possible to do a range check on the length field of a packet using some filters (u32 filter??) then you could Q them in different Qs and then control when they can be sent (>= SOME FIXED TIME) say using tbf. but I am not sure if u32 can do these kinda range check. Any comments? > > > Example: > (speed is limited to 33.6 Kbit/sec using tbf as leaf node of one CBQ class) > > [root@rack1 root]# time scp root@10.10.10.65:/boot/vmlinuz-netli /tmp > root@10.10.10.65's password: > vmlinuz 100% |*************************************************| 907 KB 03:09 > > real 4m1.375s > user 0m0.003s > sys 0m0.012s > > > [root@rack1 root]# ping 10.10.10.65 > PING 10.10.10.65 (10.10.10.65) from 10.10.10.64 : 56(84) bytes of data. > 64 bytes from 10.10.10.65: icmp_seq=0 ttl=254 time=354 usec > 64 bytes from 10.10.10.65: icmp_seq=1 ttl=254 time=229 usec > > --- 10.10.10.65 ping statistics --- > 2 packets transmitted, 2 packets received, 0% packet loss > round-trip min/avg/max/mdev = 0.229/0.291/0.354/0.064 ms > [root@rack1 root]# > > _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
