Florin Andrei wrote:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=62295What is the reason why IO-APIC is disabled in the RH kernels? I have a desktop system, optimized for heavy multimedia work, which has quite a few PCI controllers in it (IEEE1394, analog video capture, etc.) besides the usual stuff (network, video). The normal IRQ space is quite tight. Here's a sample of /proc/interrupts: Due to IRQ overlaps, the performance of the system is quite suboptimal, especially when devices using the same IRQ are working at the same time. Enabling IO-APIC makes room above IRQ 15, potentially eliminating those nasty interrupt overlaps. I've noticed that when using a vanilla 2.4.20 kernel with IO-APIC enabled. The system has an AthlonXP proc, and an nForce1 motherboard.
I'm not sure if this is related, but "local apic" seems to cause problems for just about every mobile Athlon as well as several other Athlon machines.
When I enable APIC on 2.4.x and 2.5.x kernels on these machines it causes this kind of behavior, or sometimes worse (kernel panics).
Warren Togami
warren@togaim.com
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