2011/9/26 Seungwon Jeon <tgih.jun@xxxxxxxxxxx>: > Andrei Warkentin wrote: >> Hi Seungwon, >> >> ----- Original Message ----- >> > From: "Seungwon Jeon" <tgih.jun@xxxxxxxxxxx> >> > To: linux-mmc@xxxxxxxxxxxxxxx >> > Cc: "Chris Ball" <cjb@xxxxxxxxxx>, linux-samsung-soc@xxxxxxxxxxxxxxx, >> "kgene kim" <kgene.kim@xxxxxxxxxxx>, "dh han" >> > <dh.han@xxxxxxxxxxx>, "Seungwon Jeon" <tgih.jun@xxxxxxxxxxx> >> > Sent: Monday, September 26, 2011 7:46:59 AM >> > Subject: [PATCH] mmc: dw_mmc: Support predefined multiple block >> transfers. >> > >> > This patch adds the support for predefined multiple block read/write. >> > >> > Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx> >> >> Without knowing much about dw_mmc host, your logic otherwise looks ok, >> given what >> I've previously done for SDHCI as far as CMD23/Auto-CMD23 enhancement. >> Just curious, what eMMC cards did you test this on, and what improvement >> did you see? > > Thank you for review. > As you done, predefined transfer is required for reliable writes and eMMC4.5 feature. > Sadly, I didn't gain an improvement in my case. > (I don't know whether I can clarify the tested eMMC card, just one sample.) > So far I've seen some Sandisk cards have a noticeable real-life improvement (30%) over open-ended transfers. You might wish to try out https://github.com/andreiw/superalign to be certain. A -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
 |