Patrick McHardy wrote:
Andy Furniss wrote:
What do you think about making HTB hysteresis 0 and possibly set HZ to
1000 when HTB is selected?
I'm not qualified to judge about HTB hysteresis, but we can't change HZ,
most people just enable everything which would mean basically everybody
would be using HZ=1000 again.
Fair enough - maybe a note about HZ and hysteresis in HTB help?
By default now I think jitter on htb is 8ms on 100mbit it's 1ms with the
tweaks (depending on there being 1 class).
Irrespective of Hz, at low speed - say 128kbit the default setting of
HYSTERSIS 1 means that bulk packets are sent in pairs unneccerily adding
90ms to jitter.
HTB default qlen is that of the device or 3 if it is less. Maybe it
should be increased 30? 3 is pretty useless for thoughput, but means
that people who don't specify/get default lengths on sub queues get a
half working setup.
That only affects the "direct queue" for unclassified packets, doesn't
it?
tc qdisc add dev ppp0 handle 1:0 root htb
tc class add dev ppp0 classid 1:1 htb rate 220kbit
tc filter add dev ppp0 protocol ip u32 match u32 0 0 classid 1:1
gives a 3 pkt queue I think each class gets 3 if there are more classes
Andy.
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