Re: [Lksctp-developers] CWND accounting

[Michael T. <Mic...@lu...>]

Hi Vlad,

thank you very much for your explanation. Now I understand the
traces I see.

Best regards
Michael

On Feb 16, 2006, at 8:40 PM, Vlad Yasevich wrote:

> On Thu, 2006-02-16 at 19:53 +0100, Michael Tuexen wrote:
>> Thank you.
>>
>> And another question. Is LKSCTP only bundling when it is  
>> retransmitting?
>> Or does not also bundle on transmission. I'm asking because I see  
>> some
>> behaviour at limited links which I want to understand.
>
> New chunks almost never get bundled.  The only possible time is when
> retransmitting flushed the retransmit queue and cwnd still allows more
> chunks.  It's the only time you may see new TSNs being bundled.
>
> -vlad
>
>>
>> Best regards
>> Michael
>>
>> On Feb 16, 2006, at 7:26 PM, Vlad Yasevich wrote:
>>
>>> Michael
>>>
>>> On Thu, 2006-02-16 at 19:05 +0100, Michael Tuexen wrote:
>>>> Dear all,
>>>> just a simple question. Assume that the LKSCTP stack sends out an
>>>> SCTP
>>>> packet with only one DATA chunk having 37 bytes of user data. So  
>>>> the
>>>> DATA
>>>> chunk length would be 37 + 16 = 53 plus 3 bytes padding. This means
>>>> the SCTP
>>>> packet would contain 12 + 53 + 3 = 68 bytes.
>>>>
>>>> The stack needs a variable which counts the outstanding bytes
>>>> and compares that value against the CWND to make the decision
>>>> wether the
>>>> CHUNK can be sent or not. My question is now, how many bytes to you
>>>> account for the above packet? Do you increment the outstanding  
>>>> bytes
>>>> variable by 37 or 53 or 56 or 68 or another value?
>>>
>>> 37.  lksctp uses the size of user data only.
>>>
>>> -vlad
>>>
>>>>
>>>> Best regards
>>>> Michael
>>>>
>>>>
>>>>
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>>>
>>>
>>
>
>