[Xenomai-core] Socket Buffer overflow

[Xenomai-core] Socket Buffer overflow

[Robin Walser]

Hello,

I must write on my socket(rt_dev_sendmsg()) verry fast. Often I have 
then a memory overflow. Is it possible?
How can I examine whether sufficient memory is available?

Thanks.

Re: [Xenomai-core] Socket Buffer overflow

[Wolfgang Grandegger]

Hello,

Robin Walser wrote:
> Hello,
> 
> I must write on my socket(rt_dev_sendmsg()) verry fast. Often I have 
> then a memory overflow. Is it possible?
> How can I examine whether sufficient memory is available?

Are you using RT-Socket-CAN? Could you please provide more detailed 
information like what is the returned error code and are there kernel 
log messages (visible with $ dmsg)?

Wolfgang.

Re: [Xenomai-core] Socket Buffer overflow

[Robin Walser]

> Are you using RT-Socket-CAN? Could you please provide more detailed 
> information like what is the returned error code and are there kernel 
> log messages (visible with $ dmsg)?
>
> Wolfgang.
My programm based on frag-ip: 
http://www.rts.uni-hannover.de/rtnet/lxr/source//examples/xenomai/native/frag-ip.c
I use RTnet. The returned error code is always -115 and I have no kernel 
log messages.
I think, I'm only need a buffer status report. Is this available?

Robin

Re: [Xenomai-core] Socket Buffer overflow

[Jan Kiszka]

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Robin Walser wrote:
> 
>> Are you using RT-Socket-CAN? Could you please provide more detailed
>> information like what is the returned error code and are there kernel
>> log messages (visible with $ dmsg)?
>>
>> Wolfgang.
> My programm based on frag-ip:
> http://www.rts.uni-hannover.de/rtnet/lxr/source//examples/xenomai/native/frag-ip.c

[Hmm, might be tricky to tell apart, but this is now an example for a
RTnet-specific question => rtnet-user list. If it wasn't, xenomai-help
would have been the preferred place for support requests.]

> 
> I use RTnet. The returned error code is always -115 and I have no kernel
> log messages.
> I think, I'm only need a buffer status report. Is this available?

Are you sure it's 115? Anyway, buffer overflows can happen if you sent
out frames at a higher rate than hardware can handle. Throttle your
transmission, at least once that error pops up.

But what is your desired transmission rate after all? Why not set up a
periodic transmission task, either waiting for timer events or on the
RTmac/TDMA cycle (if you use TDMA with RTnet)?

Jan


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