lists@xxxxxxxxxxxxx wrote:
Hello,
i have a linux box which is acting as a lan router towards the internet
doing traffic shaping.
My link is 10Mbit/s full duplex.
I have set some HTB classes with a rate of 20% (2Mbit/s) and a ceil of
95% (9.5Mbit/s). Is such an excursion of bandwidth in the HTB classes
feasible for HTB to control?
I would have thought it's OK, 9.5mbit may be a bit close to the limit
depending on what yout overheads on the link are.
What Timer frequency (kernel menuconfig) is the most suitable among 250,
300 and 1000Hz for HTB? Also, I really don't have any ideas on how the
frequency could affect the network adapter performance. Is a high
frequency going to have bad effects on interrupts handling? Has anybody
any suggestions about this issue?
I would say 1000 is best. An individual class needs a burst/cburst size
big enough to reach its rate/ceil so you can have smaller bursts on classes.
HTB was written when Hz=100 and unless you specify burst/quantum it will
choose them from the rates. If you do use 1000 it may be worth having a
look what it chose with tc -s -d class ls dev ....
I have some warnings about HTB quantums being too big, but as i
understand, those should only affect the precision of the shaping
without undermining the shaping completely.
Quantum affects the way excess bandwidth is shared - you can specify it
on each line that has a rate/ceil if you want - minimum should be 1514
on eth with mtu 1500. If you don't specify it HTB will use the rates to
set it, which may not be what you want.
Andy.
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