Is this read or write speed? Can you isolate and find different speed? Can you also check the read/write command code coming to the driver? I remember of an issue where single block commands being sent from MMC core resulting in low performance.
Thanks and regards, ~Vipin From: [email protected] [mailto:[email protected]] On Behalf Of zuowenping Sent: Monday, August 03, 2009 5:02 PM To: Steve Chen Cc: davinci-linux-open-source Subject: Re: Re: why is the sd/mmc so slowly in writing about dm355? thansk Steve Chen a lot! I am testing with a sd card(ScanDisk 1.0G)! 2009-08-03 ________________________________________ zuowenping ________________________________________ 发件人： Steve Chen 发送时间： 2009-08-03 19:21:12 收件人： zuowenping 抄送： davinci-linux-open-source 主题： Re: why is the sd/mmc so slowly in writing about dm355? On Mon, 2009-08-03 at 19:08 +0800, zuowenping wrote: > I am testing the speed of sd/mmc in dm355 which using kernel 2.6.18. > > bash-3.00# mount /dev/mmcblk0p1 /mnt -o sync > bash-3.00# time cp /tmp/ramdisk.img.gz /mnt/ > > real 0m19.996s > user 0m0.000s > sys 0m0.960s > > bash-3.00# ls -l /tmp/ramdisk.img.gz > -rwxr--r-- 1 root root 3476678 Jan 1 > 00:01 /tmp/ramdisk.img.gz > > > > so，the speed about mmc is about 170 kb/s,but i want speeds about > sd/mmc above 1.5M/s,how can i optimize the driver ? > Is the slow speed for MMC, SD, or both? Even though both card type plug into the same slot, but they take very different code patch. Regards, Steve _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
