[LARTC] Clock Source Kernel settings in 2.6.22

[Mario Antonio Garcia]

I used to get an average of  18900kbit.
My hope was that these new patches would bring better accuracy.
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.


Regards,

Mario Antonio

----- Original Message ----- 
From: "Patrick McHardy" <kaber at trash.net>
To: "Mario Antonio Garcia" <dino at webjogger.net>
Cc: <lartc at mailman.ds9a.nl>
Sent: Friday, August 31, 2007 5:43 AM
Subject: Re: [LARTC] Clock Source Kernel settings in 2.6.22


> On Wed, 29 Aug 2007, Mario Antonio Garcia wrote:
>
>> I wonder if somebody has got good results (accurate shaping) using 
>> 2.6.22?
>>
>> I am testing with 2.6.22.1, and I haven't been able to get accurate 
>> shaping.
>> For instance, I tried:
>>       $TC qdisc  add  dev  eth0 root handle 1: htb default 1
>>       $TC class  add  dev  eth0        parent 1:  classid  1:1        htb 
>> rate 100000kbit ceil 100000kbit burst 24k cburst 24k
>>       $TC class  add  dev  eth0        parent 1:1 classid 1:10        htb 
>> rate 20000kbit ceil 20000kbit burst 24k cburst 24k
>>
>> and class 1:10 shapes the traffic to 19900kbit instead of 20000kbit 
>> (bandwidth tests made with ftp and iperf)
>
>
> That seems pretty close. What values do you get with older kernels?
>
>
>
>