> -----Original Message----- > From: linux-omap-owner@xxxxxxxxxxxxxxx > [mailto:linux-omap-owner@xxxxxxxxxxxxxxx] On Behalf Of Koen Kooi > Sent: Tuesday, February 03, 2009 5:05 PM > To: Remith Ravi > Cc: linux-omap@xxxxxxxxxxxxxxx > Subject: Re: USB and SD performance issue > > > Op 3 feb 2009, om 12:16 heeft Remith Ravi het volgende geschreven: > > > Hello, > > > > Recently I have done a performance comparison of OMAP3 'USB > OTG Host' > > and 'SD' drivers on different Linux Kernels. > > The performance of latest git kernel is less comparing to > 2.6.22 TI > > kernel. > > Could some one please explain me what cause this performance > > difference? > > > > The performance is calculated by doing data transfer between RAM and > > the storage device (using 'time' command). > > > > The performance details are given below. > > > > 1) 2.6.29-rc2 kernel > > USB OTG (Host) Read (4.2 MB/s) Write > (2.6 MB/s) > > SD Card Read (3.88 MB/s) > Write (3.1 MB/s) > > > > 2) 2.6.28 kernel > > USB OTG (Host) error error > > SD Card Read (4.2 MB/s) > Write (3.27 MB/s) > > > > 3) 2.6.22 TI kernel > > USB OTG (Host) Read (5.4MB/s) Write > (6.14MB/s) > > SD Card Read (6.7MB/s) Write (6.43MB/s) > > I get this with 2.6.28: > > root@omap3evm:~# hdparm -t /dev/mmcblk0 > /dev/mmcblk0: > Timing buffered disk reads: 42 MB in 3.10 seconds = 13.53 MB/sec > > root@beagleboard:~# hdparm -t /dev/mmcblk0 > /dev/mmcblk0: > Timing buffered disk reads: 44 MB in 3.13 seconds = 14.04 MB/sec > > regards, > > Koen > What does `hdparm -tT /dev/mmcblk0` give? - Anand -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
