On Thu, 24 May 2007 22:19:09 -0600 [email protected] (Eric W. Biederman) wrote:
> Currently we blacklist known bad msi configurations which means we
> keep getting MSI enabled on chipsets that either do not support MSI,
> or MSI is implemented improperly. Since the normal IRQ routing
> mechanism seems to works even when MSI does not, this is a bad default
> and causes non-functioning systems for no good reason.
>
> So this patch inverts the sense of the MSI bus flag to only enable
> MSI on known good systems. I am seeding that list with the set of
> chipsets with an enabled hypertransport MSI mapping capability. Which
> is as close as I can come to an generic MSI enable. So for actually
> using MSI this patch is a regression, but for just having MSI enabled
> in the kernel by default things should just work with this patch
> applied.
>
> People can still enable MSI on a per bus level for testing by writing
> to sysfs so discovering chipsets that actually work (assuming we are
> using modular drivers) should be pretty straight forward.
Yup.
Do we have a feel for how much performace we're losing on those
systems which _could_ do MSI, but which will end up defaulting
to not using it?
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