On Mon, Sep 1, 2014 at 7:13 PM, Jeff Epler <jepler@xxxxxxxxxxxxxx> wrote: > On Mon, Sep 01, 2014 at 05:41:30PM +0200, Philipp Lutz wrote: >> Have you looked into setting a RTPRIO for the SPI worker threads >> <snip> > Sort of. > > I was unaware of the "rt" property so I never tried setting it on the > kernel side. However, I did run into the idea of using "chrt" on the > kernel tasks [spi1] and [irq/99-spi-s3c6]. This improved things > somewhat, but this plus eliminating DMA acquistion still left me with > some 800+us latencies that I didn't want. chrt changes the rtprio, its the same thing. Prioritizing IRQ's and using chrt is discussed (with a focus on audio soundcards) [1]. Although the page is outdated, it is the best resource I'm aware of for practical advice / walktrough of using rtprio and such. [1] http://subversion.ffado.org/wiki/IrqPriorities Cheers, -Harry www.openavproductions.com -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
