Messages in this thread | | | Date | Sun, 28 Mar 2004 19:35:08 +0200 | From | Jens Axboe <> | Subject | Re: [PATCH] speed up SATA |
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On Sun, Mar 28 2004, Jeff Garzik wrote: > Jens Axboe wrote: > >On Sat, Mar 27 2004, Jeff Garzik wrote: > > > >>I also wouldn't want to lock out any users who wanted to use SATA at > >>full speed ;-) > > > > > >And full speed requires 32MB requests? > > > Full speed is the SATA driver supporting the hardware maximum. The
Come on Jeff, don't be such a slave to the hardware specifications. Just because it's possible to send down 32MB requests doesn't necessarily mean it's a super thing to do, nor that it automagically makes 'things go faster'. The claim is that back-to-back 1MB requests are every bit as fast as a 32MB request (especially if you have a small queue depth, in that case there truly should be zero benefit to doing the bigger ones). The cut-off point is likely even lower than 1MB, I'm just using that figure as a value that is 'pretty big' yet doesn't incur too large latencies just because of its size.
-- Jens Axboe
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