On 10 May 12:24 AM, Arnd Bergmann wrote: > On Friday 09 May 2014 19:09:15 Ezequiel Garcia wrote: > > # time nanddump /dev/mtd5 -f /dev/null -q > > real 0m 5.82s > > user 0m 0.20s > > sys 0m 5.60s > > > > Jason: Care to submit a proper patch? > > > > On 08 May 04:56 PM, Arnd Bergmann wrote: > > > Ok, that is a noticeable difference. For scale, what is the size of that > > > partition? > > > > The board is Openblocks A6, running mainline. > > > > # cat /proc/mtd > > dev: size erasesize name > > mtd0: 00090000 00004000 "uboot" > > mtd1: 00044000 00004000 "env" > > mtd2: 00024000 00004000 "test" > > mtd3: 00400000 00004000 "conf" > > mtd4: 01d20000 00004000 "linux" > > mtd5: 01dec000 00004000 "user" > > Ok, so it takes 5.6 seconds in kernel mode to access 31MB, which comes down > to 5.60MB/s. That isn't very fast compared to the time the CPU should take > for those instructions, so I'm surprised it actually makes any difference > at all. > > There isn't a usable slave DMA engine in Armada XP by chance? >
The Openblocks A6 is a Kirkwood, not Armada XP. -- Ezequiel García, Free Electrons Embedded Linux, Kernel and Android Engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
