Thank you for explaining how it works. Have resigned to living with 1.5G. A reason exists to run the ES.2s at their full sequential 100 Mbytes/sec (800 Mbits/sec), and I had hoped that lowering the latency on the link might squeeze a bit more performance. But 1.5 is good enough. At 14:18 11/24/2008 +0900, Tejun Heo wrote: >starlight@xxxxxxxxxxx wrote: >> Is it possible for the BIOS to tell the chip to not negogiate >> above 1.5 Gbps? I'm wondering if HP might have done this to >> prevent the bug below from happening. If so it would be >> nice for the driver to put it back to 3 Gbps. > >The standard way to put that limit is to use SControl but it isn't doing >that, as far as ahci is concerned, it's free to negotiate any speed but >is negotiating 1.5Gbps. Maybe they capped using some hidden register to >workaround the erratum. At any rate, it doesn't really matter unless >you're gonna hang multiple devices to a single port using PMP. > >Thanks. > >-- >tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
