Messages in this thread | | | Date | Wed, 31 May 2006 08:55:23 -0400 | From | Mark Lord <> | Subject | Re: [rfc][patch] remove racy sync_page? |
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Jens Axboe wrote: > > NCQ helps us with something we can never fix in software - the > rotational latency. Ordering is only a small part of the picture.
Yup. And it also helps reduce the command-to-command latencies.
I'm all for it, and have implemented tagged queuing for a variety of device drivers over the past five years (TCQ & NCQ). In every case people say.. wow, I expected more of a difference than that, while still noting the end result was faster under Linux than MS$.
Of course with artificial benchmarks, and the right firmware in the right drives, it's easier to create and see a difference. But I'm talking more life-like loads than just a multi-threaded random seek generator.
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