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
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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