On Mon, 2016-04-11 at 18:51 +0300, Andy Shevchenko wrote: > On Mon, Apr 11, 2016 at 6:33 PM, Bryan O'Donoghue > <[email protected]> wrote: > > On Thu, 2016-04-07 at 23:37 +0300, Andy Shevchenko wrote: > > > > Preface. I tried this on Galileo and it appears to work. I'll do > > some > > throughput testing to verify but, initially the results are > > positive :) > > I submitted (and pushed into my branch) a bit changed version (see my > v2). > > > > + lpss->dma_maxburst = 8; > > > > Are these dwords ? If those are bytes then the maxburst value looks > > small. In the BSP the max burst is 32 bytes. > > max_burst is in items of given size (here is 32 bytes for memory and > 8
I haven't read your V2 yet but on this, I'd suggest raising the burst size to 32 bytes for UART (no higher) we found during bringup that larger sizes "fall-over and die" but, anything up to 32 bytes is OK - and therefore you should be able to reduce the number of bursts/interrupts etc. --- bod
