From: Mark Lord <liml@rtr.ca>
To: Gentoopower <gentoopower@yahoo.de>
Cc: "linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>
Subject: Re: NCQ general question
Date: Wed, 01 Mar 2006 13:34:38 -0500 [thread overview]
Message-ID: <4405E93E.3010307@rtr.ca> (raw)
In-Reply-To: <4405D040.8000700@yahoo.de>
Gentoopower wrote:
> Jens Axboe wrote:
>> On Wed, Mar 01 2006, Gentoopower wrote:
..
>>> I can defintely feel the speed difference between the two drives.
>>>
>> Well that can't be because of NCQ, since it isn't active :-)
>
> Got ya:-)
>
> Who said this box is running only linux?
You did, by posting to the *Linux-IDE* kernel mailing list.
All bets are off for other OSs, especially those that really
*need* NCQ for half-decent performance.
Linux doesn't, but it's definitely nice to wish for.
I've implemented host-queuing support for NCQ and TCQ on
several controllers (for Linux), and it almost always produces
only a tiny *measureable* effect on desktop systems.
Busy servers, with lots of teensy random read requests,
benefit most from it, as do benchmark programs that do a lot of seeking.
But normal system use -- running OO.org, rebuilding kernels,
etc.. no significant measurable difference. Maybe by fiddling
with the IO scheduler code (which defeats NCQ/TCQ to a degree)..
But I'd happily enable it on my own systems anyway!
Cheers
prev parent reply other threads:[~2006-03-01 18:34 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-01 7:04 NCQ general question Raz Ben-Jehuda(caro)
2006-03-01 8:56 ` Gentoopower
2006-03-01 13:49 ` Mark Lord
2006-03-01 13:55 ` Jens Axboe
2006-03-03 21:55 ` Steve Byan
2006-03-03 22:19 ` Jeff Garzik
2006-03-04 18:56 ` Steve Byan
2006-03-04 19:10 ` Jeff Garzik
2006-03-04 20:23 ` Steve Byan
2006-03-04 23:56 ` Eric D. Mudama
2006-03-05 7:19 ` Raz Ben-Jehuda(caro)
2006-03-05 7:29 ` Jeff Garzik
2006-03-01 15:56 ` Gentoopower
2006-03-01 16:05 ` Jens Axboe
2006-03-01 16:20 ` Jeff Garzik
2006-03-01 18:53 ` Jens Axboe
2006-03-02 8:14 ` Raz Ben-Jehuda(caro)
2006-03-02 8:18 ` Jens Axboe
2006-03-02 11:20 ` Jeff Garzik
2006-03-02 13:34 ` Raz Ben-Jehuda(caro)
2006-03-02 13:37 ` Jeff Garzik
2006-03-02 8:18 ` Rafal Krzewski
2006-03-02 11:35 ` Jeff Garzik
2006-03-02 14:29 ` Rafal Krzewski
2006-03-01 16:48 ` Gentoopower
2006-03-01 18:34 ` Mark Lord [this message]
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