RE: stupid SATA questions

["Aleksey Gorelov" <Aleksey_Gorelov@Phoenix.com>]

>From: linux-kernel-owner@vger.kernel.org 
>[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Jeff Garzik
>Sent: Tuesday, June 07, 2005 11:01 AM
>To: Kumar Gala
>Cc: Linux Kernel list
>Subject: Re: stupid SATA questions
>
>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.  :)

Some BIOSes/option ROMs do. Especially SATA RAID ones.
But unless you are using BIOS interrupts... 

Aleks

>
>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
>
>
>
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