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test/power: round CPU frequency to check

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The value in "/sys/.../cpuinfo_cur_freq" may not be exactly the
same as what was set. For example, if "2400000" is written to
"/sys/.../cpufreq/scaling_setspeed" to set the frequency, then the
value in "/sys/.../cpuinfo_cur_freq" may be "2401222". So need to
round the value.

Fixes: ed7c51a6a6 ("app/test: vm power management")
Cc: stable@dpdk.org

Signed-off-by: Richael Zhuang <richael.zhuang@arm.com>
Reviewed-by: David Hunt <david.hunt@intel.com>
This commit is contained in:
Richael Zhuang 2021-04-15 13:59:30 +08:00 committed by Thomas Monjalon
parent 00456850be
commit 606a234c6d
1 changed files with 15 additions and 1 deletions
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16
app/test/test_power_cpufreq.c
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@ -35,6 +35,10 @@ test_power_caps(void)
#define TEST_POWER_LCORE_INVALID ((unsigned)RTE_MAX_LCORE)
#define TEST_POWER_FREQS_NUM_MAX ((unsigned)RTE_MAX_LCORE_FREQS)
/* macros used for rounding frequency to nearest 100000 */
#define TEST_FREQ_ROUNDING_DELTA 50000
#define TEST_ROUND_FREQ_TO_N_100000 100000
#define TEST_POWER_SYSFILE_CUR_FREQ \
"/sys/devices/system/cpu/cpu%u/cpufreq/cpuinfo_cur_freq"
@ -67,7 +71,17 @@ check_cur_freq(unsigned lcore_id, uint32_t idx)
goto fail_all;
cur_freq = strtoul(buf, NULL, TEST_POWER_CONVERT_TO_DECIMAL);
ret = (freqs[idx] == cur_freq ? 0 : -1);
/* convert the frequency to nearest 100000 value
* Ex: if cur_freq=1396789 then freq_conv=1400000
* Ex: if cur_freq=800030 then freq_conv=800000
*/
unsigned int freq_conv = 0;
freq_conv = (cur_freq + TEST_FREQ_ROUNDING_DELTA)
/ TEST_ROUND_FREQ_TO_N_100000;
freq_conv = freq_conv * TEST_ROUND_FREQ_TO_N_100000;
ret = (freqs[idx] == freq_conv ? 0 : -1);
if (ret == 0)
break;