Messages in this thread | | | Date | Sat, 27 Mar 2004 19:06:06 -0500 | From | Jeff Garzik <> | Subject | Re: [PATCH] speed up SATA |
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Jeff Garzik wrote: > It's up to the sysadmin to choose a disk scheduling policy they like, > which implies that a _scheduler_, not each individual driver, should > place policy limitations on max_sectors.
<tangent>
The block layer / scheduler guys should also think about a general (not SCSI specific) way to tune TCQ tag depth. That's IMO another policy decision.
I'm about to add a raft of SATA-2 hardware, all of which are queued. The standard depth is 32, but one board supports a whopping depth of 256.
Given past discussion on the topic, you probably don't want to queue 256 requests at a time to hardware :) But the sysadmin should be allowed to, if they wish...
Jeff
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