[RFC] JS20 IDE perf patch

Doug Maxey dwm at austin.ibm.com
Wed Dec 17 03:19:19 EST 2003


  Thanks for the info.  Have not spent as much time with the 8111 spec
  as I probably should(:

  I was extrapolating the ATA_PCIMHZ_MAX for future systems that might
  have the maxed out PCIX bus.  You never know what HW throws at you

  For this particular instance, the 100 would be good. I need to
  rework the amd74xx.c changes for that one.


On Tue, 16 Dec 2003 15:54:26 +0100, Segher Boessenkool wrote:
>On 15-dec-03, at 18:06, Doug Maxey wrote:
>>   Please review these changes.  Comments are welcome.
>+#define ATA_PCIMHZ_MIN 20
>+#define ATA_PCIMHZ_MAX 512
>+#endif /* CONFIG_PPC_PSERIES */
>The 8111 HT is an 8-bit link at 200MHz, i.e. 800MB/s total or 400MB/s
>each way;
>that would translate into a 200MHz or a 100MHz PCI bus equivalent,
>value you like better (and they're both somewhat bogus anyway), but 512
>a bit high.  Anything I'm missing here?

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