Re: [PATCH] speed up SATA

Jeff Garzik
2004-03-28T00:06:39Z

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