Hi, On Wednesday 20 June 2007, Thanos Kyritsis wrote: > On Monday 18 June 2007, Mark Lord wrote: > > Thanos Kyritsis wrote: > [snip] > > > /etc/rc.d/rc.local contains the following: > > > /usr/sbin/hdparm -q -d1 -q -u1 -q -c1 -q -k1 /dev/hda > > > /usr/sbin/hdparm -q -d1 -q -u1 -q -c1 -q -k1 /dev/hdb > [snip] > > > Sounds like a (kernel) timing issue. > > The "-q" option gets rid of some intermediary printf's, > > and nothing else. So with -q, the ioctl() calls happen > > much closer together in time. Without -q, the intermediary > > printf's likely cause a resched, giving the kernel more time > > to complete anything left over from the earlier call. It could be that some assumptions that I've taken when fixing DMA tuning locking were wrong... > > ???? > > > > Any difference with a modern version of hdparm? > > The same issue happens when using hdparm 7.4 as well as 7.5. Adding a couple of printk-s to ide.c::set_using_dma() and ide.c::ide_spin_wait_hwgroup() will for sure help in debugging it further. Also could you try running UP kernel without PREEMPT and see if it makes difference? Thanks, Bart - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
