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On Sun, May 29 2005, Michael Thonke wrote: > >Nothing, unfortunately NCQ doesn't provided any way of doing ordered > >tags. The only tunable is the queue_depth, you can set that anywhere > >between 1 and 30. > > > > > > > So way my drive got default 30 as queue_depth on AHCI as you mentoined > in the next mail > 2-4 should be suitable and enough/normal? Yes, 30 will be default for basically anyone as ahci now advertises a max depth of 30 and the drives typically all support a depth of 32. The minimum value of those two is used. Whether 2-4 is 'enough' depends on your workload. But usually 2-4 is enough to get a nice speedup on heavier io, while still getting you good latencies on the individual io. -- Jens Axboe - 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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