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Message-ID: <20141009151453.GL12897@nuc-i3427.alporthouse.com> Date: Thu, 9 Oct 2014 16:14:53 +0100 From: Chris Wilson <chris@...is-wilson.co.uk> To: Chuck Ebbert <cebbert.lkml@...il.com> Cc: "H. Peter Anvin" <hpa@...ux.intel.com>, linux-kernel@...r.kernel.org, Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>, Jiri Kosina <jkosina@...e.cz>, Steven Rostedt <rostedt@...dmis.org>, Jason Baron <jbaron@...mai.com>, yrl.pp-manager.tt@...achi.com, Borislav Petkov <bpetkov@...e.de>, Ingo Molnar <mingo@...nel.org>, Daniel Vetter <daniel.vetter@...ll.ch>, x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>, Dave Jones <davej@...hat.com> Subject: Re: i915.ko WC writes are slow after ea8596bb2d8d379 On Thu, Oct 09, 2014 at 09:46:37AM -0500, Chuck Ebbert wrote: > Well they're all the same. > > Hmm, x86info is not dumping all the variable MTRRs. You have 10, but > it only prints the first 8. I don't know if it will show anything > different, but can you try fixing it with this patch? Source (https://github.com/dankamongmen/x86info) was slightly different, but I followed the drift. tldr: 8,9 appear to be identical on all cpus as well. $ sudo ./x86info --mtrr --all-cpus x86info v1.31pre Found 4 CPUs. CPU #1: Extended Family: 0 Extended Model: 2 Family: 6 Model: 42 Stepping: 7 Type: 0 (Original OEM) CPU Model (x86info's best guess): Core i7 (SandyBridge) Processor name string (BIOS programmed): Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz MTRR registers: MTRRcap (0xfe): 0x0000000000000d0a wc:1 fix:1 vcnt:10 MTRRphysBase0 (0x200): 0x0000000000000006 (physbase:0x000000 type: 0x06 (write-back)) MTRRphysMask0 (0x201): 0x0000000f80000800 (physmask:0xf80000 valid:1) MTRRphysBase1 (0x202): 0x0000000080000006 (physbase:0x080000 type: 0x06 (write-back)) MTRRphysMask1 (0x203): 0x0000000ff0000800 (physmask:0xff0000 valid:1) MTRRphysBase2 (0x204): 0x000000008e000000 (physbase:0x08e000 type: 0x00 (uncacheable)) MTRRphysMask2 (0x205): 0x0000000ffe000800 (physmask:0xffe000 valid:1) MTRRphysBase3 (0x206): 0x000000008d000000 (physbase:0x08d000 type: 0x00 (uncacheable)) MTRRphysMask3 (0x207): 0x0000000fff000800 (physmask:0xfff000 valid:1) MTRRphysBase4 (0x208): 0x0000000100000006 (physbase:0x100000 type: 0x06 (write-back)) MTRRphysMask4 (0x209): 0x0000000f80000800 (physmask:0xf80000 valid:1) MTRRphysBase5 (0x20a): 0x0000000170000000 (physbase:0x170000 type: 0x00 (uncacheable)) MTRRphysMask5 (0x20b): 0x0000000ff0000800 (physmask:0xff0000 valid:1) MTRRphysBase6 (0x20c): 0x000000016f000000 (physbase:0x16f000 type: 0x00 (uncacheable)) MTRRphysMask6 (0x20d): 0x0000000fff000800 (physmask:0xfff000 valid:1) MTRRphysBase7 (0x20e): 0x000000016e800000 (physbase:0x16e800 type: 0x00 (uncacheable)) MTRRphysMask7 (0x20f): 0x0000000fff800800 (physmask:0xfff800 valid:1) MTRRphysBase8 (0x210): 0x000000016e600000 (physbase:0x16e600 type: 0x00 (uncacheable)) MTRRphysMask8 (0x211): 0x0000000fffe00800 (physmask:0xfffe00 valid:1) MTRRphysBase9 (0x212): 0x0000000000000000 (physbase:0x000000 type: 0x00 (uncacheable)) MTRRphysMask9 (0x213): 0x0000000000000000 (physmask:0x000000 valid:0) MTRRfix64K_00000 (0x250): 0x0606060606060606 MTRRfix16K_80000 (0x258): 0x0606060606060606 MTRRfix16K_A0000 (0x259): 0x0000000000000000 MTRRfix4K_C8000 (0x269): 0x0505050505050505 MTRRfix4K_D0000 0x26a: 0x0000000000000000 MTRRfix4K_D8000 0x26b: 0x0000000000000000 MTRRfix4K_E0000 0x26c: 0x0000000000000000 MTRRfix4K_E8000 0x26d: 0x0505050505050505 MTRRfix4K_F0000 0x26e: 0x0505050505050505 MTRRfix4K_F8000 0x26f: 0x0505050505050505 MTRRdefType (0x2ff): 0x0000000000000c00 (fixed-range flag:1 enable flag:1 default type:0x00 (uncacheable)) -------------------------------------------------------------------------- CPU #2: Extended Family: 0 Extended Model: 2 Family: 6 Model: 42 Stepping: 7 Type: 0 (Original OEM) CPU Model (x86info's best guess): Core i7 (SandyBridge) Processor name string (BIOS programmed): Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz MTRR registers: MTRRcap (0xfe): 0x0000000000000d0a wc:1 fix:1 vcnt:10 MTRRphysBase0 (0x200): 0x0000000000000006 (physbase:0x000000 type: 0x06 (write-back)) MTRRphysMask0 (0x201): 0x0000000f80000800 (physmask:0xf80000 valid:1) MTRRphysBase1 (0x202): 0x0000000080000006 (physbase:0x080000 type: 0x06 (write-back)) MTRRphysMask1 (0x203): 0x0000000ff0000800 (physmask:0xff0000 valid:1) MTRRphysBase2 (0x204): 0x000000008e000000 (physbase:0x08e000 type: 0x00 (uncacheable)) MTRRphysMask2 (0x205): 0x0000000ffe000800 (physmask:0xffe000 valid:1) MTRRphysBase3 (0x206): 0x000000008d000000 (physbase:0x08d000 type: 0x00 (uncacheable)) MTRRphysMask3 (0x207): 0x0000000fff000800 (physmask:0xfff000 valid:1) MTRRphysBase4 (0x208): 0x0000000100000006 (physbase:0x100000 type: 0x06 (write-back)) MTRRphysMask4 (0x209): 0x0000000f80000800 (physmask:0xf80000 valid:1) MTRRphysBase5 (0x20a): 0x0000000170000000 (physbase:0x170000 type: 0x00 (uncacheable)) MTRRphysMask5 (0x20b): 0x0000000ff0000800 (physmask:0xff0000 valid:1) MTRRphysBase6 (0x20c): 0x000000016f000000 (physbase:0x16f000 type: 0x00 (uncacheable)) MTRRphysMask6 (0x20d): 0x0000000fff000800 (physmask:0xfff000 valid:1) MTRRphysBase7 (0x20e): 0x000000016e800000 (physbase:0x16e800 type: 0x00 (uncacheable)) MTRRphysMask7 (0x20f): 0x0000000fff800800 (physmask:0xfff800 valid:1) MTRRphysBase8 (0x210): 0x000000016e600000 (physbase:0x16e600 type: 0x00 (uncacheable)) MTRRphysMask8 (0x211): 0x0000000fffe00800 (physmask:0xfffe00 valid:1) MTRRphysBase9 (0x212): 0x0000000000000000 (physbase:0x000000 type: 0x00 (uncacheable)) MTRRphysMask9 (0x213): 0x0000000000000000 (physmask:0x000000 valid:0) MTRRfix64K_00000 (0x250): 0x0606060606060606 MTRRfix16K_80000 (0x258): 0x0606060606060606 MTRRfix16K_A0000 (0x259): 0x0000000000000000 MTRRfix4K_C8000 (0x269): 0x0505050505050505 MTRRfix4K_D0000 0x26a: 0x0000000000000000 MTRRfix4K_D8000 0x26b: 0x0000000000000000 MTRRfix4K_E0000 0x26c: 0x0000000000000000 MTRRfix4K_E8000 0x26d: 0x0505050505050505 MTRRfix4K_F0000 0x26e: 0x0505050505050505 MTRRfix4K_F8000 0x26f: 0x0505050505050505 MTRRdefType (0x2ff): 0x0000000000000c00 (fixed-range flag:1 enable flag:1 default type:0x00 (uncacheable)) -------------------------------------------------------------------------- CPU #3: Extended Family: 0 Extended Model: 2 Family: 6 Model: 42 Stepping: 7 Type: 0 (Original OEM) CPU Model (x86info's best guess): Core i7 (SandyBridge) Processor name string (BIOS programmed): Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz MTRR registers: MTRRcap (0xfe): 0x0000000000000d0a wc:1 fix:1 vcnt:10 MTRRphysBase0 (0x200): 0x0000000000000006 (physbase:0x000000 type: 0x06 (write-back)) MTRRphysMask0 (0x201): 0x0000000f80000800 (physmask:0xf80000 valid:1) MTRRphysBase1 (0x202): 0x0000000080000006 (physbase:0x080000 type: 0x06 (write-back)) MTRRphysMask1 (0x203): 0x0000000ff0000800 (physmask:0xff0000 valid:1) MTRRphysBase2 (0x204): 0x000000008e000000 (physbase:0x08e000 type: 0x00 (uncacheable)) MTRRphysMask2 (0x205): 0x0000000ffe000800 (physmask:0xffe000 valid:1) MTRRphysBase3 (0x206): 0x000000008d000000 (physbase:0x08d000 type: 0x00 (uncacheable)) MTRRphysMask3 (0x207): 0x0000000fff000800 (physmask:0xfff000 valid:1) MTRRphysBase4 (0x208): 0x0000000100000006 (physbase:0x100000 type: 0x06 (write-back)) MTRRphysMask4 (0x209): 0x0000000f80000800 (physmask:0xf80000 valid:1) MTRRphysBase5 (0x20a): 0x0000000170000000 (physbase:0x170000 type: 0x00 (uncacheable)) MTRRphysMask5 (0x20b): 0x0000000ff0000800 (physmask:0xff0000 valid:1) MTRRphysBase6 (0x20c): 0x000000016f000000 (physbase:0x16f000 type: 0x00 (uncacheable)) MTRRphysMask6 (0x20d): 0x0000000fff000800 (physmask:0xfff000 valid:1) MTRRphysBase7 (0x20e): 0x000000016e800000 (physbase:0x16e800 type: 0x00 (uncacheable)) MTRRphysMask7 (0x20f): 0x0000000fff800800 (physmask:0xfff800 valid:1) MTRRphysBase8 (0x210): 0x000000016e600000 (physbase:0x16e600 type: 0x00 (uncacheable)) MTRRphysMask8 (0x211): 0x0000000fffe00800 (physmask:0xfffe00 valid:1) MTRRphysBase9 (0x212): 0x0000000000000000 (physbase:0x000000 type: 0x00 (uncacheable)) MTRRphysMask9 (0x213): 0x0000000000000000 (physmask:0x000000 valid:0) MTRRfix64K_00000 (0x250): 0x0606060606060606 MTRRfix16K_80000 (0x258): 0x0606060606060606 MTRRfix16K_A0000 (0x259): 0x0000000000000000 MTRRfix4K_C8000 (0x269): 0x0505050505050505 MTRRfix4K_D0000 0x26a: 0x0000000000000000 MTRRfix4K_D8000 0x26b: 0x0000000000000000 MTRRfix4K_E0000 0x26c: 0x0000000000000000 MTRRfix4K_E8000 0x26d: 0x0505050505050505 MTRRfix4K_F0000 0x26e: 0x0505050505050505 MTRRfix4K_F8000 0x26f: 0x0505050505050505 MTRRdefType (0x2ff): 0x0000000000000c00 (fixed-range flag:1 enable flag:1 default type:0x00 (uncacheable)) -------------------------------------------------------------------------- CPU #4: Extended Family: 0 Extended Model: 2 Family: 6 Model: 42 Stepping: 7 Type: 0 (Original OEM) CPU Model (x86info's best guess): Core i7 (SandyBridge) Processor name string (BIOS programmed): Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz MTRR registers: MTRRcap (0xfe): 0x0000000000000d0a wc:1 fix:1 vcnt:10 MTRRphysBase0 (0x200): 0x0000000000000006 (physbase:0x000000 type: 0x06 (write-back)) MTRRphysMask0 (0x201): 0x0000000f80000800 (physmask:0xf80000 valid:1) MTRRphysBase1 (0x202): 0x0000000080000006 (physbase:0x080000 type: 0x06 (write-back)) MTRRphysMask1 (0x203): 0x0000000ff0000800 (physmask:0xff0000 valid:1) MTRRphysBase2 (0x204): 0x000000008e000000 (physbase:0x08e000 type: 0x00 (uncacheable)) MTRRphysMask2 (0x205): 0x0000000ffe000800 (physmask:0xffe000 valid:1) MTRRphysBase3 (0x206): 0x000000008d000000 (physbase:0x08d000 type: 0x00 (uncacheable)) MTRRphysMask3 (0x207): 0x0000000fff000800 (physmask:0xfff000 valid:1) MTRRphysBase4 (0x208): 0x0000000100000006 (physbase:0x100000 type: 0x06 (write-back)) MTRRphysMask4 (0x209): 0x0000000f80000800 (physmask:0xf80000 valid:1) MTRRphysBase5 (0x20a): 0x0000000170000000 (physbase:0x170000 type: 0x00 (uncacheable)) MTRRphysMask5 (0x20b): 0x0000000ff0000800 (physmask:0xff0000 valid:1) MTRRphysBase6 (0x20c): 0x000000016f000000 (physbase:0x16f000 type: 0x00 (uncacheable)) MTRRphysMask6 (0x20d): 0x0000000fff000800 (physmask:0xfff000 valid:1) MTRRphysBase7 (0x20e): 0x000000016e800000 (physbase:0x16e800 type: 0x00 (uncacheable)) MTRRphysMask7 (0x20f): 0x0000000fff800800 (physmask:0xfff800 valid:1) MTRRphysBase8 (0x210): 0x000000016e600000 (physbase:0x16e600 type: 0x00 (uncacheable)) MTRRphysMask8 (0x211): 0x0000000fffe00800 (physmask:0xfffe00 valid:1) MTRRphysBase9 (0x212): 0x0000000000000000 (physbase:0x000000 type: 0x00 (uncacheable)) MTRRphysMask9 (0x213): 0x0000000000000000 (physmask:0x000000 valid:0) MTRRfix64K_00000 (0x250): 0x0606060606060606 MTRRfix16K_80000 (0x258): 0x0606060606060606 MTRRfix16K_A0000 (0x259): 0x0000000000000000 MTRRfix4K_C8000 (0x269): 0x0505050505050505 MTRRfix4K_D0000 0x26a: 0x0000000000000000 MTRRfix4K_D8000 0x26b: 0x0000000000000000 MTRRfix4K_E0000 0x26c: 0x0000000000000000 MTRRfix4K_E8000 0x26d: 0x0505050505050505 MTRRfix4K_F0000 0x26e: 0x0505050505050505 MTRRfix4K_F8000 0x26f: 0x0505050505050505 MTRRdefType (0x2ff): 0x0000000000000c00 (fixed-range flag:1 enable flag:1 default type:0x00 (uncacheable)) -------------------------------------------------------------------------- Total processor threads: 4 This system has 1 dual-core processor with hyper-threading (2 threads per core) running at an estimated 3.30GHz -- Chris Wilson, Intel Open Source Technology Centre -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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