On Sat, Feb 24 2007, V P wrote: > Hi, > > I'm trying to modify the ordering of I/O requests in Linux kernel, and > came across the barrier flags REQ_HARDBARRIER and REQ_SOFTBARRIER. > > One thing I noticed (which might be wrong) is that all the requests > have both these flags set. What is the significance of these flags? Is
Uhm? That's definitely not true. > it a must for a request to have this? Can I reorder two requests with > these flags set? How is SOFTBARRIER different from HARDBARRIER? Both imply a reordering barrier in the io scheduler, and the hard barrier further implies a barrier at the drive/driver side. So you may not reorder across a barrier. -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
