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Re: Alpha SMP status

On Tue, 2006-12-12 at 10:23 +0900, James Andrewartha wrote:
> Hi all,
> Some of you may be aware that SMP has been broken on Alpha for most of 
> 2.6. As of linux-image-2.6.18-3-smp, I'm pleased to report that it boots 
> and runs acceptably because scsi_mod is compiled in (bug 369517). However, 
> things like ip_conntrack and ipv6 are still broken - inserting them gives 
> errors like "Could not allocate 8 bytes percpu data". This explains why 
> all the scsi drivers were broken - scsi_mod also couldn't allocate percpu 
> data and so wasn't loaded. As with scsi, you can work around this by 
> compiling them (ipv6 etc.) in to the kernel rather than as modules.
> Anyway, this points to the core of the problem as being something to do 
> with percpu data. Hopefully this narrows it down enough for someone 
> familiar with the kernel to have a go at finding and fixing the problem.

May be it is running out of space for per cpu area. You can try by
increasing the PERCPU_ENOUGH_ROOM in include/linux/percpu.h and see if
get pass. I looked other 64 bit archs x86_64 and ia64 and they both have
different value. May be alpha also needs a different value.


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