On Sun, Oct 27, 2013 at 06:56:08PM +0100, Andreas Werner wrote:
> Transmit Buffers WC (only write to that buffer)
> i have PICe bursts on my tracer.
For that you can do ioremap_wc().
> Receive Buffers WT (only read to that buffer). I use
> clflush_cache_range before reading from that adresses and i have PCIe
> bursts on my tracer.
That one I don't understand - why would you need a WT buffer? It only
caches reads but you will read from it only once after it has been
received. Why pollute the cache?
IOW, you probably could use a WC buffer here too, as it would combine
the writes coming from the FPGA.
Btw, there's also mtrr_add(..., MTRR_TYPE_WRTHROUGH, ) if you must use a
WT thing. Have you tried that?
> With UC memory there are no PCIe bursts and my bandwidth is very slow.
Right.
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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