| 1 | /* $Id: bs3-timing-1-32.c32 89142 2021-05-18 14:33:03Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - bs3-timinig-1, 32-bit C code.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2021 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <bs3kit.h>
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| 32 | #include <iprt/asm-amd64-x86.h>
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| 33 | #include <iprt/asm-math.h>
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| 34 |
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| 35 |
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| 36 | static void bs3Timing1_Tsc_One(void)
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| 37 | {
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| 38 | uint64_t const nsStart = Bs3TestNow();
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| 39 | uint64_t const uTscStart = ASMReadTSC();
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| 40 | uint64_t const nsDeadline = nsStart + RT_NS_10SEC;
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| 41 | uint64_t cNsElapsed;
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| 42 | uint64_t cTicksElapsed;
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| 43 | uint64_t cTicksMin = UINT64_MAX;
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| 44 | uint64_t cTicksMax = 0;
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| 45 | uint64_t cTicksSum = 0;
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| 46 | uint64_t cBelow512 = 0;
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| 47 | uint64_t cBelow1K = 0;
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| 48 | uint64_t cBelow4K = 0;
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| 49 | uint64_t cAbove512K = 0;
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| 50 | uint64_t cAbove1M = 0;
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| 51 | uint64_t cAbove10M = 0;
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| 52 | uint64_t cTotalLoops = 0;
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| 53 |
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| 54 | /*
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| 55 | * Test loop.
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| 56 | */
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| 57 | do
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| 58 | {
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| 59 | unsigned cLoops = 100000 + 1;
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| 60 | cTotalLoops += cLoops - 1;
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| 61 | while (--cLoops != 0)
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| 62 | {
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| 63 | uint64_t uTscPrev = ASMReadTSC();
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| 64 | uint64_t uTscNow = ASMReadTSC();
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| 65 | uint64_t cTicks = uTscNow - uTscPrev;
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| 66 |
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| 67 | /* min/max/avg */
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| 68 | cTicksSum += cTicks;
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| 69 | if (cTicks < cTicksMin)
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| 70 | cTicksMin = cTicks;
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| 71 | if (cTicks > cTicksMax)
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| 72 | cTicksMax = cTicks;
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| 73 |
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| 74 | /* range. */
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| 75 | if (cTicks < _4K)
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| 76 | {
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| 77 | cBelow4K++;
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| 78 | if (cTicks < _1K)
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| 79 | {
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| 80 | cBelow1K++;
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| 81 | if (cTicks < 512)
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| 82 | cBelow512++;
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| 83 | }
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| 84 | }
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| 85 | else if (cTicks >= _512K)
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| 86 | {
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| 87 | cAbove512K++;
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| 88 | if (cTicks >= _1M)
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| 89 | {
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| 90 | cAbove1M++;
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| 91 | if (cTicks >= 10*_1M)
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| 92 | cAbove10M++;
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| 93 | }
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| 94 | }
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| 95 | }
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| 96 | } while ((cNsElapsed = Bs3TestNow()) < nsDeadline);
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| 97 | cTicksElapsed = ASMReadTSC();
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| 98 | cTicksElapsed -= uTscStart;
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| 99 | cNsElapsed -= nsStart;
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| 100 |
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| 101 | /*
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| 102 | * Report results.
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| 103 | *
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| 104 | * Note! in 32-bit and 16-bit mode, values 4G or higher gets formatted as
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| 105 | * hexadecimal to avoid 64-bit division.
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| 106 | */
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| 107 |
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| 108 | Bs3TestPrintf("%'14RU64 loops in %'RU64 ns / %'RU64 ticks\n", cTotalLoops, cNsElapsed, cTicksElapsed);
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| 109 |
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| 110 | /* Report results in ticks. */
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| 111 | Bs3TestPrintf("average %RU64 ticks, min %'RU64, max %'RU64\n",
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| 112 | cTicksSum / cTotalLoops, cTicksMin, cTicksMax);
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| 113 | Bs3TestPrintf("%'14RU64 below 512\n", cBelow512);
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| 114 | Bs3TestPrintf("%'14RU64 below 1K\n", cBelow1K);
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| 115 | Bs3TestPrintf("%'14RU64 below 4K\n", cBelow4K);
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| 116 | Bs3TestPrintf("%'14RU64 inbetween\n", cTotalLoops - cBelow4K - cAbove512K);
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| 117 | Bs3TestPrintf("%'14RU64 above 512K\n", cAbove512K);
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| 118 | Bs3TestPrintf("%'14RU64 above 1M\n", cAbove1M);
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| 119 | Bs3TestPrintf("%'14RU64 above 10M\n", cAbove10M);
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| 120 |
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| 121 | /* results in nanoseconds */
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| 122 | if (cNsElapsed && cTicksElapsed)
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| 123 | {
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| 124 | /* Missing ??U8M and the assembly bugger. */
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| 125 | //uint64_t const uFreq = ASMMultU64ByU32DivByU32(cTicksElapsed, RT_NS_1SEC, cNsElapsed);
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| 126 | //uint64_t const uFreq = cTicksElapsed * (uint64_t)RT_NS_1SEC / cNsElapsed;
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| 127 | uint64_t const uFreq = cTicksElapsed / cNsElapsed;
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| 128 | Bs3TestPrintf("%RU64 Hz\n", uFreq);
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| 129 | }
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| 130 | }
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| 131 |
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| 132 | BS3_DECL(void) bs3Timing1_Tsc_pe32(void)
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| 133 | {
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| 134 | Bs3TestPrintf("bs3Timing1_Tsc_pe32\n");
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| 135 | bs3Timing1_Tsc_One();
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| 136 | }
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| 137 |
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| 138 | /* P.S. don't forget: VBoxManage setextradata bs3-timing-1 VBoxInternal/Devices/VMMDev/0/Config/TestingEnabled 1 */
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| 139 |
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