Re: [LARTC] HTB MPU

[Andy Furniss <andy.furniss@dsl.pipex.com>]

Jason Boxman wrote:
> On Friday 14 May 2004 05:55, Andy Furniss wrote:
> <snip>
> 
>>If you can get a cell count from your modem you can work it out with
>>ping. I don't know what your pppoe is.
> 
> 
> I can probably get my USB Stringray out of the closet and hook it up.  I think 
> the Windows diagnostic utility for it actually included some stuff about 
> frames and cell sizes.  The browser based diagnostics on my Westell don't 
> include anything interesting.
> 
> 
>>Your upstream worst case depends on your bitrate and your MTU. If it's
>>128k you add about 90ms, 256k 45ms for 1500b packets. What's yours?
> 
> 
> My upstream is supposedly 256Kbps.  I am running the ADSL modem in 
> pass-through mode, so it gives my Linux router the live IP.  When I did PPPoE 
> internally I had an MTU of 1492 and used the RP PPPoE daemon.

Could be this then -

You can make HTB more accurate by setting HTB_HYSTERESIS to 0 in
net/sched/sch_htb.c.

To save time - if you built HTB as a module, you can probably (well it
worked for me) get away with editing htb.c and do

make SUBDIRS=net/sched modules
and replacing /lib/modules/[kversion]/kernel/net/sched/htb.o with the
new htb.o from your source tree.

If you are doing it live stop shaping and check with lsmod that modprobe
-r gets rid (do it again if it's still there) of the old htb.o and
reload shaping scripts.

Andy.





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