Messages in this thread | | | Date | Sat, 27 Mar 2004 17:02:57 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] speed up SATA |
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Jeff Garzik <jgarzik@pobox.com> 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.
Slightly beneficial for throughput, disastrous for latency.
It appears the only way we'll ever get this gross misdesign fixed is to add a latency test to winbench.
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