On Monday 11 February 2008, Zik Saleeba wrote: > While we're on the subject of the pxa2xx_spi driver, I've found that > it has incredibly slow throughput. The problem appears to be related to > the use of a tasklet in pumping messages. The initial setup and > transfer is quick but then the tasklet is started and a context switch > causes terrible latency. It takes around a millisecond for the tasklet > to get control at which point the chip select is released and the SPI > bus is available for the next transfer. This means that running as > hard as it can the bus is idle 99% of the time. I've experimented with > removing the tasklet from the driver and it does improve the situation > markedly.
Got patch? :) - Dave ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
