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Justin Piszcz wrote: > Without NCQ, performance is MUCH better on almost every operation, with > the exception of 2-3 items. Variables to take into account: * the drive (NCQ performance wildly varies) * the IO scheduler * the filesystem (if not measuring direct to blkdev) * application workload (or in your case, benchmark tool) * in particular, the threaded-ness of the apps For the overwhelming majority of combinations, NCQ should not /hurt/ performance. For the majority of combinations, NCQ helps (though it may not be often that you use more than 4-8 tags). In some cases, NCQ firmware may be broken. There is a Maxtor firmware id, and some Hitachi ids that people are leaning towards recommending be added to the libata 'horkage' list. Jeff - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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