Hi. Seungwon, Would you show improved performance measurement result(read/write,seq,ran) when using packed cmd ? Thanks. 2012/1/20 Kyungmin Park <kmpark@xxxxxxxxxxxxx>: > Hi, > > FYI: we get performance gain using packed command at write. however in > case of small size read, there are some performance drop since > protocol overhead. > In normal case, read command uses read operation only, but in case of > packed read. It sends the command to eMMC and read it. > Anyway it's good feature for eMMC v4.5. > > Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> > > On 1/20/12, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote: >> This patch-set adds support of packed command feature >> for eMMC4.5 devices. >> >> Changes in v3: >> - Add a variable member in mmc_host for minimum number of packed entries. >> This value can be overrided by host. >> - Fix a handling of error sequence. >> >> Changes in v2: >> - Fix the packed read sequence and error handling. >> - Apply checking the exception status for all cases with >> the comments from Maya Erez and Sahitya Tummala. >> - Fix preparing the packed list with the comment from Maya Erez and >> Venkatraman. >> >> >> Seungwon Jeon (2): >> mmc: core: Add packed command feature of eMMC4.5 >> mmc: core: Support packed command for eMMC4.5 device >> >> drivers/mmc/card/block.c | 469 >> +++++++++++++++++++++++++++++++++++++++++--- >> drivers/mmc/card/queue.c | 48 +++++- >> drivers/mmc/card/queue.h | 13 ++ >> drivers/mmc/core/host.c | 2 + >> drivers/mmc/core/mmc.c | 24 +++ >> drivers/mmc/core/mmc_ops.c | 1 + >> include/linux/mmc/card.h | 3 + >> include/linux/mmc/core.h | 3 + >> include/linux/mmc/host.h | 4 + >> include/linux/mmc/mmc.h | 15 ++ >> 10 files changed, 555 insertions(+), 27 deletions(-) >> >> Best regards, >> Seungwon Jeon. >> -- >> 1.7.2.3 >> >> >> -- >> 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-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- 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
