[En-Nut-Discussion] Fear not, good Sir... TCP might still be saved...

[Michael Jones]

Hi,

I've looked at your solution - yet, as this can solve the symptoms it does
not solve the problem.

I have done further research and can say that the actual NutEventPostFromIrq
is not the problem. It's a general problem with e.g. One Shot Timers and the
use (abusage) of the heap. Also there seems to be a problem with the expired
timer cleanup. In the case of the SMSC chip simply setting the timeout to 0
solves the problem to but that's not the real solution to the real problem.

But anyway, thanks for your input!

Cu,
Michael


-----Original Message-----
From: en-nut-discussion-bounces at egnite.de
[mailto:en-nut-discussion-bounces at egnite.de] On Behalf Of Marek Pavlu
Sent: Wednesday, June 21, 2006 10:46 AM
To: 'Ethernut User Chat (English)'
Subject: RE: [En-Nut-Discussion] Fear not,good Sir... TCP might still be
saved...

Hi, 

My opinion is that cause of this problem is excessive exposed
NutEventPostFromIrq. I mean that evil is in event management:).

In case NutEventWait with timeoute you prove that, Michael. 
In case NutEventWait with infinite timeoutem it is still question. 

Maybe I have an idea, how it quickly solve ;). 
One way is modification Nut/OS semaphore for post from irq and do them more
safety(critical section and overload). In this case many call irq is only
one call NutEventPostFromIrq and its mean that in case of irq call:

1. rxi5 is waiting  => only one call NutEventPostFromIrq for multiple irq 2.
rxi5 is working => NutEventPostFromIrq is not call! 

This way conserve system resource's and avoid problem in event management...



For RTL8019(I have only this chip) and 4.0.2.1 ethernut version. 
I test this modifications and so far is good:), but more test is required...


Files is here http://www.hw-group.com/download/supp/ethernut/rxi5.zip 






Regards, 
                Marek Pavlu 




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