Kiruthika Selvamani wrote:
Hi Andy, Thanks for the suggestion. I changed the MTU to 1500 and it started working. Is this because HTB shapes traffic based on packet rate rather than bit rate? How does it use the rate lookup tables?
It's not based on packet rate as such, the lookup tables are for the time delay for different packet lengths at the different rates. There is one for each rate and ceil pre calculated for efficiency.
Each table has 256 slots so the mtu is needed to fill it efficiently, with normal mtu each slot is 8 bytes apart. If you had told htb the mtu of lo (16436) then each slot would have been calculated to cover a bigger range of bytes.
I suppose the giants counter is a warning that these packets are not being shaped properly as they are too big. I suppose devik decided to do this in preference to calculating the delay for every giant so it didn't slow things down too much.
Personally I am glad he didn't just use the interface mtu, as my dsl ppp0 gets one of 32k - it never sees a packet bigger than 1500 though, so if htb used 32k the shaping of small packets would be too innacurate.
Andy. _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
