Hello.
In short Linux Advanced Routing & Traffic Control HOWTO''s chapter
15.4. Prioritizing interactive traffic does not help me at all.
I have an asymmetric ADSL connection nominal 64Kbit in / 16Kbit out,
real (based on bulk transfers measures) 256Kbit/26Kbit. First thing I
would like to improve is to keep interactive (ssh) connection fast
even if uplink is full. The test I make for this measuring full ssh
connection time (with command ''time ssh <remote host>
</dev/null'')
while having a remote host downloading from me something at the
highest rate.
For simpliest tc configurations I get the following results (if both
up/down link are free ssh establishes connection in about 4s):
1. pfifo ~4m30s
2. pfifo_fast ~4m
3. sqf ~4m30s
4. prio ~4m30s
The configurations are:
pfifo:
tc qdisc add dev eth0 root pfifo
pfifo_fast:
no qdisc,
iptables -A POSTROUTING -t mangle -o eth0 -p tcp --dport ssh -j TOS --set-tos
Minimize-Delay
iptables -A POSTROUTING -t mangle -o eth0 -p tcp --sport ftp-data -j TOS
--set-tos Maximize-Throughput
sqf:
tc qdisc add dev eth0 root sfq perturb 10
prio:
tc qdisc add dev eth0 root handle 1: prio
tc filter add dev eth0 protocol ip parent 1: prio 1 u32 match ip dport 22 0xffff
flowid 1:1
tc filter add dev eth0 protocol ip parent 1: prio 1 u32 match ip sport 20 0xffff
flowid 1:3
tc filter add dev eth0 protocol ip parent 1: prio 2 u32 match ip src <my ip
address> flowid 1:2
BTW I have a couple of questions about prio qdisc:
1. What if I add it with
tc qdisc add dev eth0 root handle 1: prio
? how do I put filters on it''s classes?
2. Is there a simple way to write a filter which matches all packets?
Thanks,
--
Alexander Kotelnikov
Saint-Petersburg, Russia
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