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BSD send() => BSD_ENOMEM

Hi,

I'm actually implementing a webserver with multiple threads and sockets listening to port 80.

The MDK is version 5.29.

Assuming the BSD send() can be called from different threads for different sockets, I don't understand the return value BSD_ENOMEM, which I sometimes get.

All these error return values are not really described in detail. "Not enough memory" for BSD_ENOMEM is not really helpful.

Which memory got low?
I tried to play with the Ethernet core memory (NET_MEM_POOL_SIZE), the heap and all involved stack sizes of the KEIL driver.
No luck. Can't get rid of this error.

It does not happen very often. Let's say 1 out of 5000 send() calls.

It happens in blocking & non-blocking mode.

Any help is appreciated.

Michael

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Franc Urbanc over 4 years ago +2 verified

" Not enough memory " means the available memory in the memory pool got low. There is only one memory pool used in the Network component. It is configured with NET_MEM_POOL_SIZE macro. Default value...

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0 Galuski over 4 years ago in reply to Franc Urbanc
Hi Frank!

First let me thank you for your complete and professional answer! I really appreciate it.

I forgot to mention that our webserver is from Segger.

I was assuming that the involved memory buffer is the net mem pool and I already played with the size.
But also increasing the buffer to 60k didn't solve the problem.
Instead I discovered a strange behavior of the enabled DHCP client: With some big values of the buffer size, the DHCP client didn't receive an IP address anymore (netDHCP_Notify() wasn't triggered anymore). But that is going to be subject of another post ;-)

I'm going to obey your tips with the task handling functions and give you feedback.

"Sending smaller blocks": Do you suggest sizing down the maximal TCP segment size or a manual segmentation on my side before I give the data to the send() function?

Again thanks for the help.

Michael
Pittsburgh, USA
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0 Galuski over 4 years ago in reply to Franc Urbanc
Hi Frank!

First let me thank you for your complete and professional answer! I really appreciate it.

I forgot to mention that our webserver is from Segger.

I was assuming that the involved memory buffer is the net mem pool and I already played with the size.
But also increasing the buffer to 60k didn't solve the problem.
Instead I discovered a strange behavior of the enabled DHCP client: With some big values of the buffer size, the DHCP client didn't receive an IP address anymore (netDHCP_Notify() wasn't triggered anymore). But that is going to be subject of another post ;-)

I'm going to obey your tips with the task handling functions and give you feedback.

"Sending smaller blocks": Do you suggest sizing down the maximal TCP segment size or a manual segmentation on my side before I give the data to the send() function?

Again thanks for the help.

Michael
Pittsburgh, USA
Cancel
Up 0 Down

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