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I though that NCQ was intended to increase performance ??
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My Raptor drive WDC WD740ADFD-00 Rev: 20.0 performs worse with NCQ than with NCQ, Alan Cox has added it to a blacklist but I dont think that is in the mainline kernel yet. Search the list archives for my previous postings about it, including some hdparm -tT results. Andy
Raptors have "server style" firmware in them. When NCQ is turned on, they self-optimize for random seeks rather than for sequential read-ahead. My hdparm test is a sequential read-ahead test, so it will naturally perform worse on a Raptor when NCQ is on. That doesn't mean NCQ is bad on all Raptors; it just means it's not good for large sequential reads. Cheers - 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
