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aCOSwt
Bodhisattva
Joined: 19 Oct 2007
Posts: 2537
Location: Hilbert space
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 Posted: Sun Dec 06, 2009 12:55 pm Post subject: Broken chipset / Reroute for broken IRQs |
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Hello,
Trying to find my way in the configuration of a "low-latency" kernel, I found the X86_REROUTE_FOR_BROKEN_IRQS option flag activated by default. (in the Processor & Features section)
Taking into account that :
- the associated feature increases the latency I am trying to limit,
- this feature is needed only with specific "broken" chipsets,
I do not wish to set it if my hardware does not require it.
=> Where can I find a list of such "broken" chipsets in order to check mine against this list ? |
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turtles
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Joined: 31 Dec 2004
Posts: 1698
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| Posted: Sat Dec 12, 2009 5:26 pm Post subject: |
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I think that broken IRQ have to do with the bios and mother board design more than a specific chip.
You could disable the option and check the output of fo irq related errors and non working hard ware.
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aCOSwt
Bodhisattva
Joined: 19 Oct 2007
Posts: 2537
Location: Hilbert space
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| Posted: Sat Dec 12, 2009 5:49 pm Post subject: |
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| turtles wrote: | | I think that broken IRQ have to do with the bios and mother board design more than a specific chip. |
It had to do with the motherboard design including a specific Intel chip : The 825x APIC.
Modern design still include this "broken" chip but as part of the northbridge.
=> Broken IRQs have no longer to do with mobo's design but with the design of the northbridge.
=> Broken IRQ's still occuring in such an architecture imply a "broken" chipset.
I have built my kernel while playing with the LiveDVD 10.1 for which X86_REROUTE_FOR_BROKEN_IRQ appears not set when I zcat /proc/config.gz
And approximatly everything works apparently well.
From this, crossing my fingers, I infere that, for the time being, my Intel P43 is not "broken" 
Anyway ! Thank you for answering turtles. |
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