Jeremy Higdon wrote: [] > I'll put it even more strongly. My experience is that disabling write > cache plus disabling barriers is often much faster than enabling both > barriers and write cache enabled, when doing metadata intensive > operations, as long as you have a drive that is good at CTQ/NCQ.
Now, and it's VERY interesting at least for me (and is off-topic in this thread) -- which drive(s) are good at NCQ? I tried numerous SATA (NCQ is about sata, right? :) drives, but NCQ either does nothing in terms of performance or hurts. Yesterday we ordered another drive from Hitachi (their "raid edition" thing), -- will try it tomorrow, but I've no hope here as it's some 5th or 6th model/brand already. (Ol'good SCSI drives, even 10 years old, shows large difference when TCQ is enabled...) Thanks! -- 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/