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Message-ID: <20141009130047.GJ12897@nuc-i3427.alporthouse.com> Date: Thu, 9 Oct 2014 14:00:47 +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> Subject: Re: i915.ko WC writes are slow after ea8596bb2d8d379 On Thu, Oct 09, 2014 at 07:44:16AM -0500, Chuck Ebbert wrote: > Could you try installing x86info and running "x86info --mtrr > --all-cpus" while running the broken kernel? # /opt/xorg/src/intel-gpu-tools/tests/gem_gtt_speed IGT-Version: 1.8-g32a0308 (x86_64) (Linux: 3.17.0+ x86_64) Time to read 16k through a GTT map: 318.643µs Time to write 16k through a GTT map: 203.103µs Time to clear 16k through a GTT map: 53.098µs Time to clear 16k through a cached GTT map: 49.925µs (i.e. bad kernel) # x86info --mtrr --all-cpus x86info v1.30. Dave Jones 2001-2011 Feedback to <davej@...hat.com>. 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): Unknown model. Processor name string (BIOS programmed): Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz MTRR registers: MTRRcap (0xfe): 0x0000000000000d0a (smrr flag: 0x1, wc flag: 0x1, fix flag: 0x1, vcnt field: 0x0a (10)) MTRRphysBase0 (0x200): 0x0000000000000006 (physbase field:0x000000 type field: 0x06 (write-back)) MTRRphysMask0 (0x201): 0x0000000f80000800 (physmask field:0xf80000 valid flag: 1) MTRRphysBase1 (0x202): 0x0000000080000006 (physbase field:0x080000 type field: 0x06 (write-back)) MTRRphysMask1 (0x203): 0x0000000ff0000800 (physmask field:0xff0000 valid flag: 1) MTRRphysBase2 (0x204): 0x000000008e000000 (physbase field:0x08e000 type field: 0x00 (uncacheable)) MTRRphysMask2 (0x205): 0x0000000ffe000800 (physmask field:0xffe000 valid flag: 1) MTRRphysBase3 (0x206): 0x000000008d000000 (physbase field:0x08d000 type field: 0x00 (uncacheable)) MTRRphysMask3 (0x207): 0x0000000fff000800 (physmask field:0xfff000 valid flag: 1) MTRRphysBase4 (0x208): 0x0000000100000006 (physbase field:0x100000 type field: 0x06 (write-back)) MTRRphysMask4 (0x209): 0x0000000f80000800 (physmask field:0xf80000 valid flag: 1) MTRRphysBase5 (0x20a): 0x0000000170000000 (physbase field:0x170000 type field: 0x00 (uncacheable)) MTRRphysMask5 (0x20b): 0x0000000ff0000800 (physmask field:0xff0000 valid flag: 1) MTRRphysBase6 (0x20c): 0x000000016f000000 (physbase field:0x16f000 type field: 0x00 (uncacheable)) MTRRphysMask6 (0x20d): 0x0000000fff000800 (physmask field:0xfff000 valid flag: 1) MTRRphysBase7 (0x20e): 0x000000016e800000 (physbase field:0x16e800 type field: 0x00 (uncacheable)) MTRRphysMask7 (0x20f): 0x0000000fff800800 (physmask field:0xfff800 valid flag: 1) 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: 0x1, mtrr flag: 0x1, type field: 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): Unknown model. Processor name string (BIOS programmed): Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz MTRR registers: MTRRcap (0xfe): 0x0000000000000d0a (smrr flag: 0x1, wc flag: 0x1, fix flag: 0x1, vcnt field: 0x0a (10)) MTRRphysBase0 (0x200): 0x0000000000000006 (physbase field:0x000000 type field: 0x06 (write-back)) MTRRphysMask0 (0x201): 0x0000000f80000800 (physmask field:0xf80000 valid flag: 1) MTRRphysBase1 (0x202): 0x0000000080000006 (physbase field:0x080000 type field: 0x06 (write-back)) MTRRphysMask1 (0x203): 0x0000000ff0000800 (physmask field:0xff0000 valid flag: 1) MTRRphysBase2 (0x204): 0x000000008e000000 (physbase field:0x08e000 type field: 0x00 (uncacheable)) MTRRphysMask2 (0x205): 0x0000000ffe000800 (physmask field:0xffe000 valid flag: 1) MTRRphysBase3 (0x206): 0x000000008d000000 (physbase field:0x08d000 type field: 0x00 (uncacheable)) MTRRphysMask3 (0x207): 0x0000000fff000800 (physmask field:0xfff000 valid flag: 1) MTRRphysBase4 (0x208): 0x0000000100000006 (physbase field:0x100000 type field: 0x06 (write-back)) MTRRphysMask4 (0x209): 0x0000000f80000800 (physmask field:0xf80000 valid flag: 1) MTRRphysBase5 (0x20a): 0x0000000170000000 (physbase field:0x170000 type field: 0x00 (uncacheable)) MTRRphysMask5 (0x20b): 0x0000000ff0000800 (physmask field:0xff0000 valid flag: 1) MTRRphysBase6 (0x20c): 0x000000016f000000 (physbase field:0x16f000 type field: 0x00 (uncacheable)) MTRRphysMask6 (0x20d): 0x0000000fff000800 (physmask field:0xfff000 valid flag: 1) MTRRphysBase7 (0x20e): 0x000000016e800000 (physbase field:0x16e800 type field: 0x00 (uncacheable)) MTRRphysMask7 (0x20f): 0x0000000fff800800 (physmask field:0xfff800 valid flag: 1) 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: 0x1, mtrr flag: 0x1, type field: 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): Unknown model. Processor name string (BIOS programmed): Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz MTRR registers: MTRRcap (0xfe): 0x0000000000000d0a (smrr flag: 0x1, wc flag: 0x1, fix flag: 0x1, vcnt field: 0x0a (10)) MTRRphysBase0 (0x200): 0x0000000000000006 (physbase field:0x000000 type field: 0x06 (write-back)) MTRRphysMask0 (0x201): 0x0000000f80000800 (physmask field:0xf80000 valid flag: 1) MTRRphysBase1 (0x202): 0x0000000080000006 (physbase field:0x080000 type field: 0x06 (write-back)) MTRRphysMask1 (0x203): 0x0000000ff0000800 (physmask field:0xff0000 valid flag: 1) MTRRphysBase2 (0x204): 0x000000008e000000 (physbase field:0x08e000 type field: 0x00 (uncacheable)) MTRRphysMask2 (0x205): 0x0000000ffe000800 (physmask field:0xffe000 valid flag: 1) MTRRphysBase3 (0x206): 0x000000008d000000 (physbase field:0x08d000 type field: 0x00 (uncacheable)) MTRRphysMask3 (0x207): 0x0000000fff000800 (physmask field:0xfff000 valid flag: 1) MTRRphysBase4 (0x208): 0x0000000100000006 (physbase field:0x100000 type field: 0x06 (write-back)) MTRRphysMask4 (0x209): 0x0000000f80000800 (physmask field:0xf80000 valid flag: 1) MTRRphysBase5 (0x20a): 0x0000000170000000 (physbase field:0x170000 type field: 0x00 (uncacheable)) MTRRphysMask5 (0x20b): 0x0000000ff0000800 (physmask field:0xff0000 valid flag: 1) MTRRphysBase6 (0x20c): 0x000000016f000000 (physbase field:0x16f000 type field: 0x00 (uncacheable)) MTRRphysMask6 (0x20d): 0x0000000fff000800 (physmask field:0xfff000 valid flag: 1) MTRRphysBase7 (0x20e): 0x000000016e800000 (physbase field:0x16e800 type field: 0x00 (uncacheable)) MTRRphysMask7 (0x20f): 0x0000000fff800800 (physmask field:0xfff800 valid flag: 1) 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: 0x1, mtrr flag: 0x1, type field: 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): Unknown model. Processor name string (BIOS programmed): Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz MTRR registers: MTRRcap (0xfe): 0x0000000000000d0a (smrr flag: 0x1, wc flag: 0x1, fix flag: 0x1, vcnt field: 0x0a (10)) MTRRphysBase0 (0x200): 0x0000000000000006 (physbase field:0x000000 type field: 0x06 (write-back)) MTRRphysMask0 (0x201): 0x0000000f80000800 (physmask field:0xf80000 valid flag: 1) MTRRphysBase1 (0x202): 0x0000000080000006 (physbase field:0x080000 type field: 0x06 (write-back)) MTRRphysMask1 (0x203): 0x0000000ff0000800 (physmask field:0xff0000 valid flag: 1) MTRRphysBase2 (0x204): 0x000000008e000000 (physbase field:0x08e000 type field: 0x00 (uncacheable)) MTRRphysMask2 (0x205): 0x0000000ffe000800 (physmask field:0xffe000 valid flag: 1) MTRRphysBase3 (0x206): 0x000000008d000000 (physbase field:0x08d000 type field: 0x00 (uncacheable)) MTRRphysMask3 (0x207): 0x0000000fff000800 (physmask field:0xfff000 valid flag: 1) MTRRphysBase4 (0x208): 0x0000000100000006 (physbase field:0x100000 type field: 0x06 (write-back)) MTRRphysMask4 (0x209): 0x0000000f80000800 (physmask field:0xf80000 valid flag: 1) MTRRphysBase5 (0x20a): 0x0000000170000000 (physbase field:0x170000 type field: 0x00 (uncacheable)) MTRRphysMask5 (0x20b): 0x0000000ff0000800 (physmask field:0xff0000 valid flag: 1) MTRRphysBase6 (0x20c): 0x000000016f000000 (physbase field:0x16f000 type field: 0x00 (uncacheable)) MTRRphysMask6 (0x20d): 0x0000000fff000800 (physmask field:0xfff000 valid flag: 1) MTRRphysBase7 (0x20e): 0x000000016e800000 (physbase field:0x16e800 type field: 0x00 (uncacheable)) MTRRphysMask7 (0x20f): 0x0000000fff800800 (physmask field:0xfff800 valid flag: 1) 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: 0x1, mtrr flag: 0x1, type field: 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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