Reply 40 of 41, by archsan
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wrote:wrote:@idspispopd: do you know about PIO through DMA feature on some PCI SATA controllers like the Silicon Image mentioned here? The feature is listed as "Virtual DMA in PCI with serial link in legacy PIO mode". I'm trying to find a good reference on it.
Only experience: Windows XP on a C2D notebook using SATA in legacy IDE mode instead native AHCI (onboard Intel controller). Because of a bug XP sometimes falls back to PIO mode. Very slow performance, boot time > 15 minutes. Can be fixed through the registry.
Of course, but I'm sure onboard intel controllers don't have this "virtual dma" feature. I've found a reference from SiliconImage describing that in this mode, the communication from the controller to system/RAM runs in DMA mode even though the device is set to PIO.
"Any sufficiently advanced technology is indistinguishable from magic."—Arthur C. Clarke
"No way. Installing the drivers on these things always gives me a headache."—Guybrush Threepwood (on cutting-edge voodoo technology)
