Re: [U-Boot] usb_test_unit_ready called every block read - performance

Dear Jim Shimer,

While tuning ext2load, we found that usb_test_unit_ready was being called every block read. We compared the usb block storage to the scsi block storage cmd_scsi.c, and found that the scsi device was only calling its scsi_setup_test_unit_ready() during scsi_can. It appears that usb_test_unit_ready() really only needs to be called once during usb_stor_scan(), via usb_stor_get_info(). Is there a particular reason usb_test_unit_ready is called for every block read, or do you think its ok to only call during usb_stor_scan()? We're finding this speeds up ext2load quite a bit.

Jim, did we get anywhere on this one ? Can you try with the new ext4 code in Wolfgangs' u-boot-master/ext4 branch?

Regards, Jim

Best regards, Marek Vasut