From: Jeff Garzik <jgarzik@pobox.com>
To: Kumar Gala <kumar.gala@freescale.com>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: stupid SATA questions
Date: Tue, 07 Jun 2005 14:00:31 -0400 [thread overview]
Message-ID: <42A5E0BF.8000103@pobox.com> (raw)
In-Reply-To: <10d4b7cd189d7b661a84e765ab8cce93@freescale.com>
Kumar Gala wrote:
> These questions were posed to me and I was hoping someone would have
> better knowledge about the works and usage of SATA then I do. All of
> these questions are around understanding how important the performance
> of PIO mode is.
>
> How often would one run in PIO mode? Why would one run in PIO mode?
Never. No idea. :)
Unless you have a broken device, or a command that cannot work with DMA
(such as IDENTIFY DEVICE), PIO mode is quite pointless. It is emulated
under SATA, turned into FIS's on the SATA bus.
Jeff
next prev parent reply other threads:[~2005-06-07 18:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-07 14:43 stupid SATA questions Kumar Gala
2005-06-07 18:00 ` Jeff Garzik [this message]
2005-06-08 15:42 ` Robert White
2005-06-08 17:43 ` Jeff Garzik
2005-06-10 18:51 ` Robert White
2005-06-11 18:47 ` jgarzik
2005-06-12 13:56 ` Abhijit Bhopatkar
-- strict thread matches above, loose matches on Subject: below --
2005-06-07 22:28 Aleksey Gorelov
2005-06-07 22:31 ` Jeff Garzik
2005-06-07 22:36 Aleksey Gorelov
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