From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id DF71EA0A0E for ; Thu, 15 Apr 2021 07:59:50 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 04E30162016; Thu, 15 Apr 2021 07:59:50 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mails.dpdk.org (Postfix) with ESMTP id 7A1A6162009; Thu, 15 Apr 2021 07:59:47 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id EC40811B3; Wed, 14 Apr 2021 22:59:46 -0700 (PDT) Received: from wls-arm-cavium06.shanghai.arm.com (wls-arm-cavium06.shanghai.arm.com [10.169.206.120]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D72223F792; Wed, 14 Apr 2021 22:59:44 -0700 (PDT) From: Richael Zhuang To: dev@dpdk.org Cc: nd@arm.com, alan.carew@intel.com, stable@dpdk.org, David Hunt , Pablo de Lara Date: Thu, 15 Apr 2021 13:59:29 +0800 Message-Id: <20210415055930.3899-2-richael.zhuang@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210415055930.3899-1-richael.zhuang@arm.com> References: <20210407074636.26891-2-richael.zhuang@arm.com> <20210415055930.3899-1-richael.zhuang@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [dpdk-stable] [PATCH v5 1/2] test/power: add delay before checking cpuinfo cur freq X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" For some platforms the newly-set frequency may not be effective immediately. If we didn't get the right value from cpuinfo_cur_freq immediately, add 10ms delay each time before rechecking until timeout. >From our test, for some arm platforms, it requires up to 700ms when going from a minimum to a maximum frequency. And it's not the driver/software issue. Fixes: ed7c51a6a680 ("app/test: vm power management") Cc: alan.carew@intel.com Cc: stable@dpdk.org Signed-off-by: Richael Zhuang --- app/test/test_power_cpufreq.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) diff --git a/app/test/test_power_cpufreq.c b/app/test/test_power_cpufreq.c index 731c6b4dc..d47b3e0a1 100644 --- a/app/test/test_power_cpufreq.c +++ b/app/test/test_power_cpufreq.c @@ -8,6 +8,7 @@ #include #include #include +#include #include "test.h" @@ -44,11 +45,13 @@ static int check_cur_freq(unsigned lcore_id, uint32_t idx) { #define TEST_POWER_CONVERT_TO_DECIMAL 10 +#define MAX_LOOP 100 FILE *f; char fullpath[PATH_MAX]; char buf[BUFSIZ]; uint32_t cur_freq; int ret = -1; + int i; if (snprintf(fullpath, sizeof(fullpath), TEST_POWER_SYSFILE_CUR_FREQ, lcore_id) < 0) { @@ -58,13 +61,27 @@ check_cur_freq(unsigned lcore_id, uint32_t idx) if (f == NULL) { return 0; } - if (fgets(buf, sizeof(buf), f) == NULL) { - goto fail_get_cur_freq; + for (i = 0; i < MAX_LOOP; i++) { + fflush(f); + if (fgets(buf, sizeof(buf), f) == NULL) + goto fail_all; + + cur_freq = strtoul(buf, NULL, TEST_POWER_CONVERT_TO_DECIMAL); + ret = (freqs[idx] == cur_freq ? 0 : -1); + + if (ret == 0) + break; + + if (fseek(f, 0, SEEK_SET) < 0) { + printf("Fail to set file position indicator to 0\n"); + goto fail_all; + } + + /* wait for the value to be updated */ + rte_delay_ms(10); } - cur_freq = strtoul(buf, NULL, TEST_POWER_CONVERT_TO_DECIMAL); - ret = (freqs[idx] == cur_freq ? 0 : -1); -fail_get_cur_freq: +fail_all: fclose(f); return ret; -- 2.20.1