Re: [Lksctp-developers] Duplicate SCTP payload sent on both primary and secondary paths of multi-homed

[Vlad Y. <vla...@hp...>]

Son Le wrote:
> Can you tell me what happen when we set the spp_sackdelay=0 in
> PEER-ADDR-PARAMETER. Does this mean that lksctp will be using the
> default (as 200 ms) ? 
> 

I can't really tell you without seeing your kernel code since from
what I remember you are running a custom kernel.

For a while the implementation has been that a value of 0 doesn't change
the current value.  This is probably what happens in your case.

> I assume that the unit is in million seconds (ms).

Yes.

-vlad

> 
> Thanks,
> Son
> 
> -----Original Message-----
> From: Le, Son (CAR:SI52) 
> Sent: Thursday, April 26, 2007 10:34 AM
> To: 'Vlad Yasevich'
> Cc: Michael Tuexen; lks...@li...
> Subject: RE: [Lksctp-developers] Duplicate SCTP payload sent on both
> primary and secondary paths of multi-homed
> 
> You are correct. Did not know the SACK delay was 200ms. I think we will
> make the SACK delay provisionable. 
> 
> Thanks,
> Son
> 
> -----Original Message-----
> From: Vlad Yasevich [mailto:vla...@hp...]
> Sent: Thursday, April 26, 2007 9:46 AM
> To: Le, Son (CAR:SI52)
> Cc: Michael Tuexen; lks...@li...
> Subject: Re: [Lksctp-developers] Duplicate SCTP payload sent on both
> primary and secondary paths of multi-homed
> 
> Michael Tuexen wrote:
>> Hi Son Le,
>>
>> could it be that the sender uses an RTO.Min (or RTO.Max) of 200 ms and
> 
>> that the receiver delays SACKs for up to 200 ms? That does not work.
>>
>> If you lower RTO.min and/or RTO.max you must lower the SACK.delay 
>> accordingly.
>> Just a guess.
>>
> 
> Certainly looks this way by from the capture shown.  What is RTO.Min set
> to? 
> 
> Do you see the same problem if you send more then 1 data packet?
> 
> -vlad
> 
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