All right, so priorizing ACK packets is one of the solutions. Then, do
you use 1:20 class for ACK packets? Or just by setting the parameters
'quantum 1514', 'prio #' and 'burst #k' is enough to do it inside
whatever traffic runs through 1:20?.
In case you assign one whole htb class for ACK packets,if i am not
using priority bands (just ensuring VoIP´s QoS) is it so simple as
asignate them a low bandwidth (1Kb) and higher priority?
Thanks a lot.
-Diego
gypsy escribió:
Diego Cabrero wrote:
Hello everyone:
As it is known, when you limit uplink bandwidth it usually gets downlink
bandwidth to a lower value.
I just want to know what is the optimal configuration for eth1 and imq0
according to some variables of tc(HTB), txqueuelen, mtu, etc. to make
these packet flows less independent on an ethernet based network.
Thank you in advance.
-Diego
Diego,
Since nobody else answered this, I'll give it a try.
I accelerate all small packets on the egress side because this sends the
ACK packets ASAP. Doing this improves download speed.
I use 'quantum 1514', 'prio #' and 'burst #k' in my 'tc class add'
lines. E.G.:
tc class add dev eth1 parent 1:1 classid 1:20 htb rate $RATE ceil \
$CEIL burst 16k quantum 1514 prio 2
Make sure the sum of the rates is <= the parent rate. Some say it is
better to patch htb to deque one packet at a time rather than 2. I
don't.
Be sure you change your linux kernel source
vi ~linux/include/net/pkt_sched.h
so it uses PSCHED_CPU because JIFFIES just does not cut the mustard.
I am just now implementing IMQ. What a pain getting it to compile (bad
linux 2.4 patch)! I can't say yet if this is the right approach, but I
intend to accelerate SSH and put everything else into a default bulk
class, adding an esfq qdisc:
~'parent 1:20 handle 20: esfq limit 64 depth 64 divisor 10 \
hash dst perturb 20'
and then filter SSH by source and dest port 22 into accelerated 1:10. I
want to shape the incoming flows by where the packets come from - but I
might change my mind after I try this :o
I looked at documentation on the DSL sites about tweaking, then at Oskar
Andreasson's tutorial to understand the /proc settings, but I can't find
my notes about what I changed. I did increase buffer sizes, but I can't
recall anything further right now... IIRC, most things were correct so
I did not change much.
--
gypsy
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