Messages in this thread | | | Date | Sun, 28 Mar 2004 12:24:06 -0500 | From | Jeff Garzik <> | Subject | Re: [PATCH] speed up SATA |
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Jamie Lokier wrote: > Jeff Garzik wrote: > >>TCQ-on-write for ATA disks is yummy because you don't really know what >>the heck the ATA disk is writing at the present time. By the time the >>Linux disk scheduler gets around to deciding it has a nicely merged and >>scheduled set of requests, it may be totally wrong for the disk's IO >>scheduler. TCQ gives the disk a lot more power when the disk integrates >>writes into its internal IO scheduling. > > > Does TCQ-on-write allow you to do ordered write commits, as with barriers, > but without needing full cache flushes, and still get good performance?
Nope, TCQ is just a bunch of commands rather than one. There are no special barrier indicators you can pass down with a command.
Jeff
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