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* [dpdk-dev] [PATCH] test/power: fix several bugs in cpufreq autotest
@ 2021-04-06  2:55 Richael Zhuang
  0 siblings, 0 replies; only message in thread
From: Richael Zhuang @ 2021-04-06  2:55 UTC (permalink / raw)
  To: dev; +Cc: alan.carew, stable, David Hunt, Pablo de Lara

1. Sleep for 1s before checking the newly updated value from
"/sys/devices/system/cpu/cpu%u/cpufreq/cpuinfo_cur_freq", because
for some systems it may not be effective immediately.

2. The value in "/sys/.../cpuinfo_cur_freq" may not be exactly the
same as what we set. For example, we write "2400000" 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: ed7c51a6a680 ("app/test: vm power management")
Cc: alan.carew@intel.com
Cc: stable@dpdk.org

Change-Id: I3b0266415a2b655d58294a3f51a6051bc1e5fc7f
CustomizedGitHooks: yes
Jira: ENTWLS-2032
Signed-off-by: Richael Zhuang <richael.zhuang@arm.com>
---
 app/test/test_power_cpufreq.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/app/test/test_power_cpufreq.c b/app/test/test_power_cpufreq.c
index 731c6b4dc..c4f4541ac 100644
--- a/app/test/test_power_cpufreq.c
+++ b/app/test/test_power_cpufreq.c
@@ -34,6 +34,10 @@ 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"

@@ -43,6 +47,9 @@ static uint32_t freqs[TEST_POWER_FREQS_NUM_MAX];
 static int
 check_cur_freq(unsigned lcore_id, uint32_t idx)
 {
+       /* wait for the value to be updated */
+       sleep(1);
+
 #define TEST_POWER_CONVERT_TO_DECIMAL 10
        FILE *f;
        char fullpath[PATH_MAX];
@@ -62,7 +69,17 @@ check_cur_freq(unsigned lcore_id, uint32_t idx)
                goto fail_get_cur_freq;
        }
        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);

 fail_get_cur_freq:
        fclose(f);
--
2.20.1

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2021-04-06  2:55 [dpdk-dev] [PATCH] test/power: fix several bugs in cpufreq autotest Richael Zhuang

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