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Date:      Wed, 11 Feb 2009 15:26:35 -0800
From:      Mark Atkinson <atkin901@yahoo.com>
To:        freebsd-current@freebsd.org
Subject:   Re: memory alignment problems with -current on amd64? [Found Cause]
Message-ID:  <gmvmrb$hg2$1@ger.gmane.org>
References:  <gl7hu4$q7k$1@ger.gmane.org> <gmqbv1$jhe$1@ger.gmane.org> <gmsnin$qg9$1@ger.gmane.org> <ca3526250902110900r6e3703c2gf4f63678949a2e33@mail.gmail.com>

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Alan Cox wrote:

> On Tue, Feb 10, 2009 at 2:20 PM, Mark Atkinson <atkin901@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@yahoo.com
(!wired)?(coffee++):(wired);




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