Andrei Warkentin wrote: > 2011/9/26 Seungwon Jeon <tgih....@samsung.com>: > > Andrei Warkentin wrote: > >> Hi Seungwon, > >> > >> ----- Original Message ----- > >> > From: "Seungwon Jeon" <tgih....@samsung.com> > >> > To: linux-mmc@vger.kernel.org > >> > Cc: "Chris Ball" <c...@laptop.org>, linux-samsung-...@vger.kernel.org, > >> "kgene kim" <kgene....@samsung.com>, "dh han" > >> > <dh....@samsung.com>, "Seungwon Jeon" <tgih....@samsung.com> > >> > 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....@samsung.com> > >> > >> 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.
I had already tested this patch with IOZONE, but I found no difference. Maybe a result depends on eMMC device. As your recommend, I applied above benchmark tool. Predefined transfer seems like a little better, but there is no difference. Thanks. Seungwon Jeon. > > A > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majord...@vger.kernel.org > 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
