Mark Lord wrote: > Heh.. I haven't instrumented it yet, but I did discover a bit more about > it: > > The Power-Off_Retract_Count incrmenents *only* when there's data in the > on-drive write-cache. So if I haven't written anything significantly large > before suspending, then it often does NOT increment the retract counter. > > But if I copy a couple of multi-MB files around and then suspend (to RAM), > the retract count gets incremented. > > So I've now just stuck "hdparm -F /dev/sda" into my suspend script, > and that cures the problem completely for me. "-F" does a FLUSH_CACHE, > and requires a recent copy of hdparm. > > Perhaps libata should also do a FLUSH_CACHE before any STANDBYNOW command, > prior to entering STR, which is what my script is currently now doing.. > > I'll instrument libata and see what the current sequence is. Hmmmm.. libata should issue FLUSH CACHE on STR too. sd_suspend() and sd_shutdown() are pretty similar after all. -- tejun - 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
