How do I measue latency?

How do I measue latency?

[Johnathan Hicks]

ASUS was lazy when crafting the ACPI tables for my A7M266-D motherboard, and 
set the C2 and C3 latency values to 101 and 1001 respectivley to disable them. 
I know that ACPI doesn't do C2/C3 on SMP yet, but I would like to be be able 
to measure some real values to insert in the FADT(FACP?) for when it can be 
used. Both measuring and inserting into that table are possible right?
As a side note, they goofed on the _S3_ object and wrote S_3_ instead in the DSDT.

--John



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Re: How do I measue latency?

[Alan Cox]

On Thu, 2002-08-01 at 05:10, Johnathan Hicks wrote:
> ASUS was lazy when crafting the ACPI tables for my A7M266-D motherboard, and 
> set the C2 and C3 latency values to 101 and 1001 respectivley to disable them. 
> I know that ACPI doesn't do C2/C3 on SMP yet, but I would like to be be able 
> to measure some real values to insert in the FADT(FACP?) for when it can be 
> used. Both measuring and inserting into that table are possible right?
> As a side note, they goofed on the _S3_ object and wrote S_3_ instead in the DSDT.

The current -ac tree has a non ACPI power management module that works
on this board, if that helps. Its not perfect but -ac6 will have the
updated one



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Re: How do I measue latency?

[Alan Cox]

On Thu, 2002-08-01 at 05:10, Johnathan Hicks wrote:
> ASUS was lazy when crafting the ACPI tables for my A7M266-D motherboard, and 
> set the C2 and C3 latency values to 101 and 1001 respectivley to disable them. 
> I know that ACPI doesn't do C2/C3 on SMP yet, but I would like to be be able 
> to measure some real values to insert in the FADT(FACP?) for when it can be 
> used. Both measuring and inserting into that table are possible right?
> As a side note, they goofed on the _S3_ object and wrote S_3_ instead in the DSDT.

Doh and I just realised of course that you also worked on that so you
knew there was a native one - sorry



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Re: How do I measue latency?

[Johnathan Hicks]

Alan Cox wrote:
> Doh and I just realised of course that you also worked on that so you
> knew there was a native one - sorry

No problem. :-)

--John




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