On Tue, 5 Jul 2011 23:35:32 +0200 Per Forlin wrote:
+MMC block driver +================
+The issue_rw_rq() in the MMC block driver is made non-blocking. +The increase in throughput is proportional to the time it takes to +prepare (major part of preparations are dma_map_sg and dma_unmap_sg) +a request and how fast the memory is. The faster the MMC/SD is +the more significant the prepare request time becomes. Roughly the expected +performance gain is 5% for large writes and 10% on large reads on a L2 cache +platform. In power save mode, when clocks run on a lower frequency, the DMA +preparation may cost even more. As long as these slower preparations are run +in parallel with the transfer performance wont be affected.
won't
Acked-by: Randy Dunlap rdunlap@xenotime.net
thanks. --- ~Randy *** Remember to use Documentation/SubmitChecklist when testing your code ***