Am 11.10.2010 23:45, Gilles Chanteperdrix wrote: > Stefan Kisdaroczi wrote: >> Am Montag 11 Oktober 2010, 21:10:14 schrieb Gilles Chanteperdrix: >>> Peter Pastor wrote: >>>> Hey Gilles, >>>> >>>> Thanks for the hint. I "fixed" this problem by loading the nvidia driver >>>> (instead of nv) as default. Now the graphic cards uses IRQ 24 which does >>>> not collide with IRQ 11 of the CAN bus card (see attached lspci.txt). >>>> >>>> The only other device that uses IRQ 11 is >>>> # 00:00.0 Host bridge [0600]: Intel Corporation 5520 I/O Hub to ESI Port >>>> [8086:3406] (rev 13) >>>> >>>> But I guess that is ok, is it ? I checked the FAQs and went through the >>>> list but I feel I can't do much. I will try a few things and disable >>>> everything that is unneeded. The FAQ list also suggests to enable >>>> CONFIG_PCI_MSI which is disabled right now. What would now be a >>>> reasonable thing to do ? >>> Keep PCI_MSI disabled. The FAQ is wrong and should be fixed. >> >> Hi Gilles and Jan, >> >> what is wrong with PCI_MSI? In late june there was a discussion on this list >> about irq-sharing [1]. Jan's statement at the end of the discussion: >>> The better news is that modern hardware now more and more provides MSI, >>> and that's an inherently unshared IRQ source. >> >> We consider ordering custom built pcie boards (msi) to solve the irq-sharing >> problem i have with my pci board. Bad idea ? >> >> Stefan >> >> [1] https://mail.gna.org/public/xenomai-help/2010-06/msg00194.html > > The patch Adeos as-is does not support MSI. See the thread here: > https://mail.gna.org/public/adeos-main/2008-08/threads.html >
Provided the chipset allows fast PCI config access, this should still be fixable. Will see if I can find some cycles for this. Moreover, there is long-term hope: MSI-X does not suffer from that need to interact with shared resources - for a good reasons: the old way scales poorly. Jan
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