[LARTC] Clock Source Kernel settings in 2.6.22

[Patrick McHardy]

[Please keep me in CC/To, I don't read lartc often]

Mario Antonio Garcia wrote:
> I used to get an average of  18900kbit.
> My hope was that these new patches would bring better accuracy.

Well, you're up from 94.5% to 99.95%, so they seem to do :)

> Notice the 24 cburst. I am just trying to compensate the inaccuracy 
> this way. If I remove the cburst, obviously the shape rate I get goes 
> down.
>
> Perhaps I am missing something. I am  just a novice trying to get 
> exact bandwidth shaping. I have tested all the clock source types with 
> no good results.

A couple of comments:

- The patches so far only improve things on x86

- Try to test using UDP (not sure if you did) or simply a ping flood,
  TCP is not ideal.

- iproute calculates burst values automatically. With the higher
  precision clock source you can use a smaller value (also done
  automatically if you don't specify them).

- HFSC is more precise than HTB (and not the least more complicated
  to configure if you use only linear service curves)