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
Regards, Remith --To unsubscribe from this list: send the line "unsubscribe linux- omap" inthe body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
Attachment:
PGP.sig
Description: Dit deel van het bericht is digitaal ondertekend
