Re: memory alignment problems with -current on amd64? [Found Cause]

Do you know why NX is disabled on this processor?  If possible, could you
re-enable it and vm.pmap.pg_ps_enabled, and see if you still have the same
problem.

On Wed, Feb 11, 2009 at 5:26 PM, Mark Atkinson <atkin901_at_yahoo.com> wrote:

> Alan Cox wrote:
>
> > On Tue, Feb 10, 2009 at 2:20 PM, Mark Atkinson <atkin901_at_yahoo.com>
> wrote:
> > [snip]
> >>
> >>
> >>
> >> Well, taking the information I knew -- OCT 15th == good, Mid DEC == BAD,
> >> I trolled every commit logged between.   Eventually I found this one:
> >>
> >> http://svn.freebsd.org/viewvc/base?view=revision&revision=185715
> >>
> >> http://docs.freebsd.org/cgi/mid.cgi?200812061937.mB6JbqAI003273
> >>
> >> I set vm.pmap.pg_ps_enabled="0" in /boot/loader.conf, and
> >> was able to complete buildworld and -j16 buildworld and -j8 buildkernel
> >> no problem.
> >>
> >> It appears superpage mapping causes alignment problems on this box.
> >
> >
> > Can you please provide more detailed information about this machine, in
> > particular, the processor including the revision?  It would also be
> > helpful to see what gdb says about a couple of these crashes,
> > specifically, the machine registers at the time of the exception.
>
> Is there something specifically preventing cores during buildworld?  I
> can't
> find one after a bus error.   I'll try to find something to dump the
> revision for me.  Here's the verbose boot for the processor.
>
> CPU: Quad-Core AMD Opteron(tm) Processor 2352 (2100.09-MHz K8-class CPU)
>  Origin = "AuthenticAMD"  Id = 0x100f23  Stepping = 3
>
>
> Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
>  Features2=0x802009<SSE3,MON,CX16,POPCNT>
>  AMD Features=0xee400800<SYSCALL,MMX+,FFXSR,Page1GB,RDTSCP,LM,3DNow
> +,3DNow!>
>  AMD
> Features2=0x7ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS>
>  TSC: P-state invariant
>  Cores per package: 4
> L1 2MB data TLB: 48 entries, fully associative
> L1 2MB instruction TLB: 16 entries, fully associative
> L1 4KB data TLB: 48 entries, fully associative
> L1 4KB instruction TLB: 32 entries, fully associative
> L1 data cache: 64 kbytes, 64 bytes/line, 1 lines/tag, 2-way associative
> L1 instruction cache: 64 kbytes, 64 bytes/line, 1 lines/tag, 2-way
> associative
> L2 2MB data TLB: 128 entries, 2-way associative
> L2 2MB instruction TLB: 0 entries, 2-way associative
> L2 4KB data TLB: 512 entries, 4-way associative
> L2 4KB instruction TLB: 512 entries, 4-way associative
> L2 unified cache: 512 kbytes, 64 bytes/line, 1 lines/tag, 16-way
> associative
> usable memory = 10720198656 (10223 MB)
> Physical memory chunk(s):
> 0x0000000000001000 - 0x000000000009bfff, 634880 bytes (155 pages)
> 0x0000000000f55000 - 0x00000000cfe4dfff, 3471806464 bytes (847609 pages)
> 0x00000000cfe56000 - 0x00000000cfe56fff, 4096 bytes (1 pages)
> 0x0000000100000000 - 0x000000029d212fff, 6931165184 bytes (1692179 pages)
>
>
> --
> Mark Atkinson
> atkin901_at_yahoo.com
> (!wired)?(coffee++):(wired);
>
> _______________________________________________
> freebsd-current_at_freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-current
> To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org"
>