Re: [PATCH] speed up SATA

From: Jeff Garzik
Date: Sat Mar 27 2004 - 19:09:10 EST

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.


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...


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