Re: DMA not working on SATA?

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To: Robert Hancock <hancockr@...>
Cc: LKML <linux-kernel@...>
Date: Thursday, March 27, 2008 - 6:00 am

On Wed, 2008-03-26 at 23:20 -0600, Robert Hancock wrote:

So if my loadavg shoots up at the same time (indicating more than one
task wanting to run) does that infer that most of my tasks are IO
starved and waiting for the disk to catch up with them?

The main problem is I'm not sure if my disk subsystem is running as fast
as it should be. What sort of data rates should I be seeing from a
modern SATA type setup?

As Alan pointed out (and I missed) the dmesg shows DMA is enabled, it's
just hdparam doesn't seem to be able to infer the fact (new IOTCLS for
newer disk systems?).

I could be I've already peaked in my performance and I'm just making
unrealistic demands on memory usage (I have been running cvsps after
all ;-).

-- 
Alex, homepage: http://www.bennee.com/~alex/
Debian is the Jedi operating system: "Always two there are, a master and
an apprentice". -- Simon Richter on debian-devel

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Messages in current thread:
Re: DMA not working on SATA?, Robert Hancock, (Thu Mar 27, 1:20 am)
Re: DMA not working on SATA?, Alex Bennee, (Thu Mar 27, 6:00 am)
Re: DMA not working on SATA?, Roger Heflin, (Thu Mar 27, 1:45 pm)