Re: [lwip-users] Why does enabling Debug fix this tcp_sndbuf()

[address@hidden]

Am 25.03.2021 um 12:44 schrieb Trampas Stern:
> Rather than flushing cache you can create a non-cached section of RAM in
> the linker script and put buffers there.

But be aware that using non-cached buffers might be slow. While putting
the DMA descriptors into uncached memory is a good solution (you'll
normally only access a descriptor once unless its contents change),
putting data there will make the whole TX/RX frame processing in lwIP
slower and the flush/invalidate operations are orobably faster (except
for rare cases).

Being like that, it's a pity this problem still exists in vendor
drivers. I already rewrote the drivers for STM32 and ATSAM because of
that myself a wile ago (sadly, the result is not open source).

Regards,
Simon