Messages in this thread | | | From | "Ostrovsky, Boris" <> | Date | Sun, 24 Apr 2011 14:44:26 -0500 | Subject | RE: Linux 2.6.38.4 : regression due to x86 AMD ARAT feature |
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It's an old family fh processor (CPUID 00020F42) that cpu_has_amd_erratum(amd_erratum_400) apparently hasn't picked up. Since all fh processors are affected by this erratum I'll replace "c->x86 >= 0xf" with "c->x86 > 0xf" (and probably fix erratum formula anyway).
-boris ________________________________________ From: Jörg-Volker Peetz [peetz@dynato-kyma.net] Sent: Sunday, April 24, 2011 2:55 PM To: Borislav Petkov; Jörg-Volker Peetz; linux-kernel@vger.kernel.org; Ostrovsky, Boris; Herrmann3, Andreas; Petkov, Borislav Subject: Re: Linux 2.6.38.4 : regression due to x86 AMD ARAT feature
Borislav Petkov wrote, on 04/24/11 20:20: > On Sun, Apr 24, 2011 at 10:06:36AM +0200, Jörg-Volker Peetz wrote: >> With 2.6.38.4 the clock slows down and the affected laptop sometimes, e.g. for >> the output of "ps axuw" to appear, needs an input from the keyboard or the >> touchpad. Please find attached the kernel config file and the output of dmesg. >> >> Commenting out the the lines >> >> if (c->x86 >= 0xf && !cpu_has_amd_erratum(amd_erratum_400)) >> set_cpu_cap(c, X86_FEATURE_ARAT); >> >> in arch/x86/kernel/cpu/amd.c makes this laptop work as before with kernel >> 2.6.38.3. I think these lines came with commit >> d7b7f0c401303dd7eafcff11752fe74d3b75c766. > > Hmm, interesting. > > Can you send also /proc/cpuinfo please? > > Looks like your CPU is a single core K8 revE or something but we'd need > the exact family info. > > Thanks. >
Here it comes:
processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 36 model name : AMD Turion(tm) 64 Mobile Technology MT-40 stepping : 2 cpu MHz : 800.000 cache size : 1024 KB fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good nopl pni lahf_lm bogomips : 1592.98 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp tm stc
This is a nice mobile processor and i thought it was sold quite a lot. -- Best regards, Jörg-Volker.
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