Messages in this thread | | | Subject | RE: stupid SATA questions | Date | Tue, 7 Jun 2005 15:28:51 -0700 | From | "Aleksey Gorelov" <> |
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>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 > > > >- >To unsubscribe from this list: send the line "unsubscribe >linux-kernel" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html >Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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