Re: Playing with SATA NCQ

[Jeff Garzik]

On Sun, May 29, 2005 at 09:04:21PM +0200, Jens Axboe wrote:
> On Sun, May 29 2005, Mark Lord wrote:
> > My basic hdparm timing test shouldn't show much of a difference
> > with NCQ tests, becase hdparm just does a single request at a time,
> > and waits for the results before issuing another.  Now, kernel read-ahead
> > may result in some command overlap and a slight throughput increase, but..
> > 
> > Something like dbench and/or bonnie++ are more appropriate here.
> 
> I don't like bonnie++ very much and dbench is very write intensive. I
> would suggest trying tiotest, find it on sf.net. It gets easily readable
> results and they are usually fairly consistent across runs if you limit
> the RAM to something sensible (eg 256MB and using a data set size of
> 768MB).

As an FYI...  download Stephen Tweedie's verify-data tool at
http://people.redhat.com/sct/src/verify-data/

Robin Miller's 'dt' is also nice to have.

	Jeff



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/