Re: Athlon 64 X2 cpuinfo oddities

[Brandon Low <lostlogic@lostlogicx.com>]

Did the patch that fixes the out of sync cpufreq messages make it into
2.6.15 stable series?  I just acquired an athlon 64 x2 system, and was
having this:

Feb 12 15:33:33 [kernel] powernow-k8: error - out of sync, fix 0xa 0x2,
vid 0xa 0xa
Feb 12 15:33:59 [kernel] init_special_inode: bogus i_mode (300)
Feb 12 15:33:59 [kernel] ReiserFS: hda8: warning: vs-13075:
reiserfs_read_locked_inode: dead inode read from disk [283239 150550 0x0
SD]. This is likely to be race with knfsd. Ignore

Some filesystem corruptions have occurred as a result.  I'm testing
2.6.16-rc2 under the exact same conditions currently, and so far, no
errors.

Thanks,

Brandon Low


On Tue, 01/10/06 at 02:49:13 +0100, Andi Kleen wrote:
> Jesper Juhl <jesper.juhl@gmail.com> writes:
> > 
> > Well, first of all you'll notice that the second core shows a
> > "physical id" of 127 while the first core shows an id of 0.  Shouldn't
> > the second core be id 1, just like the "core id" fields are 0 & 1?
> 
> In theory it could be an uninitialized phys_proc_id (0xff >> 1), 
> but it could be also the BIOS just setting the local APIC of CPU 1
> to 0xff for some reason.
> 
> If you add a printk("PHYSCPU %d %x\n", smp_processor_id(), phys_proc_id[smp_processor_id()])
> at the end of arch/x86_64/kernel/setup.c:early_identify_cpu() what does
> dmesg | grep PHYSCPU output?
> 
> > 
> > Second thing I find slightly odd is the lack of "sse3" in the "flags" list.
> > I was under the impression that all AMD Athlon 64 X2 CPU's featured SSE3?
> > Is it a case of:
> >  a) Me being wrong, not all Athlon 64 X2's feature SSE3?
> >  b) The CPU actually featuring SSE3 but Linux not taking advantage of it?
> >  c) The CPU features SSE3 and it's being utilized, but /proc/cpuinfo
> > doesn't show that fact?
> >  d) Something else?
> 
> It's called pni (prescott new instructions) for historical reasons. We added
> the bit too early before Intel's marketing department could make up its
> mind fully, so Linux is stuck with the old codename.
> 
> -Andi
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