Hi Simon,
i'm using Rowley CrossStudio for ARM, but i've found a new buffer which
consumes most of the increased memory:
/** RX buffer size: this may be configured smaller! */
#ifndef PPPOS_RX_BUFSIZE
#define PPPOS_RX_BUFSIZE (PPP_MRU + PPP_HDRLEN)
#endif
This is around 1.5k and was not there in 1.3.2 ... however, there is no
advice in the code how "small" it can be defined to be still useful (and
what this buffer does).
Marco
Am 02.05.2012 22:46, schrieb [email protected]:
Marco Jakobs wrote:
updating a project from LwIP 1.3.2 to 1.4.0 without the use of PPP did a
minor increase of the used RAM of a few hundret bytes, which is no
problem on my limited microcontroller environment.
But a project which is using PPP (PPPoS) with LwIP did a jump up of
around 3kByte and more by the update from LwIP 1.4.0 to 1.3.2. This
really killed my free memory.
Which compiler are you using? Can you provide some kind of map file
for the 4 compiled versions (1.3.2 vs. 1.4.0; PPP vs. no PPP) so I can
compare them? That would be the fastest way to see why RAM usage
increased and what we can do about it.
Just to confirm Paul: I'm not aware of any major increase in RAM
usage, too. But then again, in the targets where RAM is an issue, I
only compile a very small subset of the complete code. Plus my MAP
analyser for MSVC (which is what I use to develop/test lwIP) is not
too good...
What are the changes which uses this huge amount of memory in LwIP 1.4.0
while using PPP?
This seems to be unknown, but I'm willing to dig into this and work on
it to reduce RAM usage, if there's no downside.
Simon
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