On 6 February 2012 10:56, Jaehoon Chung <jh80.chung@xxxxxxxxxxx> wrote: > On 02/06/2012 02:13 PM, Saugata Das wrote: > >> On 5 February 2012 08:15, Chris Ball <cjb@xxxxxxxxxx> wrote: >>> Hi, >>> >>> On Wed, Feb 01 2012, Saugata Das wrote: >>>> From: Saugata Das <saugata.das@xxxxxxxxxx> >>>> >>>> This patch groups the read or write transfers to eMMC in different contexts >>>> based on the block number. Transfers to consecutive blocks are grouped to a >>>> common context. So several small transfers combine to give performance like >>>> a large multi block transfer. >>>> >>>> The patch creates a context of 1MB multiple in non-large unit mode. Reliable >>>> mode is enabled in the context based on whether reliable write is enabled. >>> >>> Do you see any performance changes with this patchset? If so, can you >>> give details? >> >> I do not see any performance impact (positive or negative) on the >> sample eMMC-4.5 device which I have. This could be due to the slow >> bridge which I use (1-bit mode at 25MHz) to connect the eMMC-4.5 >> device on micro-SD slot of 8500 platform. > > I think that should be increased the performance by how we select the context. > I also didn't see any performance benefit..8-bit mode at 50Mhz. > But i have interest for this feature > Thanks for the info. Perhaps the initial MMC-4.5 device samples do not implement this command well. Yes, this feature is good to have in the kernel. I shall wait for some more comments on the proposed implementation before submitting the patch. > Best Regards, > Jaehoon Chung > >> >>> >>> Thanks, >>> >>> - Chris. >>> -- >>> Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/> >>> One Laptop Per Child >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
