Hi,
I am currently debugging a performance issue in qemu-img convert. I think I have found the cause and will send a patch later. But is there any reason why BDRV_REQUEST_MAX_SECTORS is not at least aligned down to 8 (4k sectors)? Any operation that is not able to determinate an optimal or maximum request size from a driver will likely use this value and might generate unaligned requests (as qemu-img convert does) as soon as the first iteration of an operation is done. Peter
