turbostat.c (6dbd25a24599db07d88a805615bad1f4d48a5749) turbostat.c (95149369c1c28b10f7318dfde54018ab107277d0)
1/*
2 * turbostat -- show CPU frequency and C-state residency
3 * on modern Intel turbo-capable processors.
4 *
5 * Copyright (c) 2013 Intel Corporation.
6 * Len Brown <len.brown@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it

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1137 * which should be more accurate than the derivation below.
1138 */
1139 } else {
1140 /*
1141 * As counter collection is not atomic,
1142 * it is possible for mperf's non-halted cycles + idle states
1143 * to exceed TSC's all cycles: show c1 = 0% in that case.
1144 */
1/*
2 * turbostat -- show CPU frequency and C-state residency
3 * on modern Intel turbo-capable processors.
4 *
5 * Copyright (c) 2013 Intel Corporation.
6 * Len Brown <len.brown@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it

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1137 * which should be more accurate than the derivation below.
1138 */
1139 } else {
1140 /*
1141 * As counter collection is not atomic,
1142 * it is possible for mperf's non-halted cycles + idle states
1143 * to exceed TSC's all cycles: show c1 = 0% in that case.
1144 */
1145 if ((old->mperf + core_delta->c3 + core_delta->c6 + core_delta->c7) > old->tsc)
1145 if ((old->mperf + core_delta->c3 + core_delta->c6 + core_delta->c7) > (old->tsc * tsc_tweak))
1146 old->c1 = 0;
1147 else {
1148 /* normal case, derive c1 */
1149 old->c1 = (old->tsc * tsc_tweak) - old->mperf - core_delta->c3
1150 - core_delta->c6 - core_delta->c7;
1151 }
1152 }
1153

--- 3911 unchanged lines hidden --- 		1146 old->c1 = 0;
1147 else {
1148 /* normal case, derive c1 */
1149 old->c1 = (old->tsc * tsc_tweak) - old->mperf - core_delta->c3
1150 - core_delta->c6 - core_delta->c7;
1151 }
1152 }
1153

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