Date: Mon, 14 Nov 2011 11:19:25 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: FreeBSD current <freebsd-current@FreeBSD.org>, Alan Cox <alc@FreeBSD.org> Subject: Re: problem with 1GB pages? Message-ID: <4EC0DD1D.9050704@FreeBSD.org> In-Reply-To: <4EBE4ECC.4060007@FreeBSD.org> References: <4EBE4ECC.4060007@FreeBSD.org>
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Please disregard my report. I've tracked the problem to one of the new modules being faulty. But memtest86* tools still don't detect any issues with it. Apparently FreeBSD is a much more thorough memory tester than the specialized tools :-) Apologies for the noise. on 12/11/2011 12:47 Andriy Gapon said the following: > > Introduction. > I have an AMD-based system with a Fam10h CPU (with 1GB pages support), the > system chipset contains an integrated graphics device (that uses a region of the > main memory as a graphics memory). The chipset supports memory hoisting to > compensate for the PCI memory window and the graphics aperture both of which are > located below 4GB. > The latest OS version installed on this system is 9-CURRENT from the middle of > September (r225560), architecture is amd64. > Until recently the system had 4GB of RAM installed and I had no problems with it > whatsoever. > > Recently though I have added another 4GB of RAM to the system. Before booting > to FreeBSD I tested the memory with multiple passes of memtest86 and > memetest86+, no errors were detected by those. > However with FreeBSD I immediately started getting "flaky memory" symptoms like > multiple internal compiler errors during compilation of non-trivially sized > projects (world, libreoffice). > I re-run memory tests which again revealed nothing and then started playing with > various VM subsystem and memory related knobs in FreeBSD. I recalled that a > long while ago there were some problems with 1GB pages and so their use used to > be disabled. On a hunch I disabled 1GB pages again: > @@ -471,7 +471,7 @@ create_pagetables(vm_paddr_t *firstaddr) > ndmpdp = 4; > DMPDPphys = allocpages(firstaddr, NDMPML4E); > ndm1g = 0; > - if ((amd_feature & AMDID_PAGE1GB) != 0) > + if (0 && (amd_feature & AMDID_PAGE1GB) != 0) > ndm1g = ptoa(Maxmem) >> PDPSHIFT; > if (ndm1g < ndmpdp) > DMPDphys = allocpages(firstaddr, ndmpdp - ndm1g); > > And the flakiness went away. > > Not sure what kind of useful information I should provide with this report. > Here's couple of things that I think could be of use. > > - memcontrol list output > http://people.freebsd.org/~avg/8gb%2b512mb.memcontrol.list.txt > > - BIOS memory map > SMAP type=01 base=0000000000000000 end=000000000009f800 len=000000000009f800 > SMAP type=02 base=00000000000f0000 end=0000000000100000 len=0000000000010000 > SMAP type=02 base=00000000fec00000 end=0000000100000000 len=0000000001400000 > SMAP type=02 base=00000000e0000000 end=00000000f0000000 len=0000000010000000 > SMAP type=02 base=000000000009f800 end=00000000000a0000 len=0000000000000800 > SMAP type=02 base=00000000afdf0000 end=00000000afe00000 len=0000000000010000 > SMAP type=01 base=0000000000100000 end=00000000afde0000 len=00000000afce0000 > SMAP type=03 base=00000000afde3000 end=00000000afdf0000 len=000000000000d000 > SMAP type=04 base=00000000afde0000 end=00000000afde3000 len=0000000000003000 > SMAP type=01 base=0000000100000000 end=0000000230000000 len=0000000130000000 > > - dmesg snippet > CPU: AMD Athlon(tm) II X2 250 Processor (3013.78-MHz K8-class CPU) > Origin = "AuthenticAMD" Id = 0x100f62 Family = 10 Model = 6 Stepping = 2 > > 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=0xee500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM,3DNow!+,3DNow!> > AMD > Features2=0x37ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS,SKINIT,WDT> > TSC: P-state invariant > real memory = 8589934592 (8192 MB) > avail memory = 7617662976 (7264 MB) > > - Top Of Memory MSR > MSR 0xc001001a: 0x00000000 0xd0000000 > > - Top Of Memory 2 MSR > MSR 0xc001001d: 0x00000002 0x30000000 > > - System configuration MSR > MSR 0xc0010010: 0x00000000 0x00760600 > > Please let me know if you have any ideas or requests for additional information > or testing. > Thank you. -- Andriy Gapon
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