On Thu, Nov 10, 2011 at 5:10 PM, Ulf Hansson <ulf.hansson@xxxxxxxxxxxxxx> wrote: > A significant increase (10-20%) in performance throughput for > USB mass storage is the reason for incrementing the value. > By some reason the USB driver allocates buffers which requires > a scattergather list to contain a lot more than 16 elements to > get optimal performance. This change sets the maximum elements > to 128. > > Tests with large reads and large writes (100 MiB) show that the > throughput increase is significant for write (10% for this test) > but not for read. Tests are run on a Linux host with ext4 FS on > the gadget mass storage device. The sg-len still exceeds 16 for > the read tests but the performance gain is low or nothing. > > Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxxxxxx> > Signed-off-by: Per Forlin <per.forlin@xxxxxxxxxxxxxx> Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx> I will try to compile the lot of MMCI patches from Russells tracker and test on the PB1176 once it's there... BTW I had to do some fixup (trivial) when I applied all the patches from the patch tracker. Hopefully Russell can do the same, else we'll just create a pull request with all of them or something. Thanks, Linus Walleij -- 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
