Hi Marek,
I test your patch with a loop-back test between usart3 and uart7 on
STM32MP157C-DK2. It
shows a speed transfer diminution (about -1,5%), some locks during
transfer, RT throttling etc...
(I use lszrz tool).
But finally, I think your patch is the best solution that we have.
Other solutions always throws an RT exception on a spin_lock.
Thanks,
Valentin
On 12/8/22 14:19, Marek Vasut wrote:
On 12/8/22 11:18, Valentin CARON wrote:
Hi Marek,
Hi,
I've got a patch in the same spirit in downstream.
The test campaign reveals performance issues with this patch.
In fact, hard IRQ have been introduced in stm32-usart driver to solve
performance issues due to short FIFO size (16 bytes).
We are currently testing another patch, similar as your RFC
proposition, for RT context.
But results are not ready yet. We can wait them before merging this
big change into driver ?
Can you post your patch as an RFC so others can test as well ?
