Dear Wolfram Sang, > On Thu, Jan 24, 2013 at 01:56:21PM +0100, Marek Vasut wrote: > > Add support for the PIO mode and mixed PIO/DMA mode support. The mixed > > PIO/DMA is the default mode of operation. This shall leverage overhead > > that the driver creates due to setting up DMA descriptors even for very > > short transfers. > > > > The current boundary between PIO/DMA 8 bytes, transfers shorter than 8 > > bytes are transfered by PIO, longer transfers use DMA. The performance > > of write transfers remains unchanged, while there is a minor improvement > > of read performance. Reading 16KB EEPROM with DMA-only operations gives > > a read speed of 39.5KB/s, while with then new mixed-mode the speed is > > blazing 40.6KB/s. > > > > Signed-off-by: Marek Vasut <marex@xxxxxxx> > > Cc: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx> > > Cc: Shawn Guo <shawn.guo@xxxxxxxxxx> > > Cc: Wolfram Sang <w.sang@xxxxxxxxxxxxxx> > > OK, the polling can be argued. I shortened the comment about the > threshold a little, since bandwidth measurements depend on a lot of > other things and it is not really needed there. > > Applied to -next, thanks! Thank you very much! And good luck with the stuff up ahead ;-) Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
