Hi, On Wed, Nov 07 2012, Kyoungil Kim wrote: > On Tue, Oct 30 2012, Chris Ball wrote: >> Hi, >> >> On Mon, Oct 22 2012, Kyoungil Kim wrote: >> > We used only single sg entry for SDIO transfer. >> > This chagne is to use multiple sg entry. >> > In case of dwmci, it support only up to 4KB size per single sg entry. >> > So if we want to transfer more than 4KB, we should send more than >> > 1 command. >> > This makes performance degradation for large data transfer. >> > >> > Signed-off-by: Kyoungil Kim <ki0351.kim@xxxxxxxxxxx> >> >> Can you share the before/after benchmark on your controller, please? > > When we test before apply this patch, it takes around 335 us for > 5K(5120) bytes transfer with dwmci controller. > But when we test after apply this patch, it takes 242 us for 5K bytes. > So this patch makes around 38% performance improvement for 5K bytes transfer. > If the transfer size is bigger, then the performance improvement ratio > will be increased. Thanks, pushed to mmc-next for 3.8. - 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
