Re: patch fr1-2.17 does not work with kernel 2.4.30

"Also sprach Peter T. Breuer:"
> limiting the speed.  Try changing the throttle numbers in
> /proc/sys/dev/raid.

If that doesn't help, you might try commenting this if-block in md.c:


                if (md_need_resched(current)) {
                        /* PTB this seems not to progress when over loop dev */
                        
                        current->state = TASK_INTERRUPTIBLE;
                        md_schedule_timeout(1);
                }

The placement of this "swap yourself out for one jiffy" has always
seemed to me to be unfortunate - just before the timing calculation,
but after the data for the calculation has already been collected.

On a heavily SMP machine, I don't see why you should even care if one
thread takes the cpu more or less continuousy for a while - if it is
doing i/o it will sleep intermittently anyway, waiting on i/o, and if
it is not doing i/o, then it's just counting fast and letting it count
will let it finish fastest while you have other cpus to do i/o with.
Plus if you have preemption on, the counting thread will be switched in
and out anyway.

Indeed, the block serves to limit i/o, but I don't think it does it
very well.

Peter