Jeff Garzik wrote:
Chuck Ebbert wrote:
Tejun Heo wrote:
FWIW several distros have turned off MSI by default and added
a "pci=msi" option to enable it.
Yeah, it seem to cause a lot of problems on certain chips but I think
the correct path is to add PCI quirks for those. Most MSI problems I've
seen are on these ATI chips. Do you happen to know any other?
We had devices that didn't do MSI right, e.g. forcedeth and others I
can't recall now.
AFAIK that's a broken diagnosis. It's the system, not the device, that
is problematic.
In the case of the Attansic L1 ethernet driver, here's what we see:
chipset kernel arch MSI functionality
=============== =========== =================
Intel 945G/ICH7 x86_64 yes
Intel 945G/ICH7 i386 yes
Via K8T890 x86_64 yes
Via K8T890 i386 no
I still don't know why, but we get a flood of APIC errors after starting the
atl1 driver on a Via K8T890 board (Asus M2V, for example) under a 32-bit kernel,
and *only* under a 32-bit kernel.
http://lkml.org/lkml/2007/4/8/68
Supporting files and such at ftp://ftp.hogchain.net/pub/linux/m2v/apic-problem
Any hints heartily welcomed...
Jay
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