From: Gowrishankar Muthukrishnan <gowrishanka...@linux.vnet.ibm.com> In ppc_64, rte_rdtsc() returns timebase register value which increments at independent timebase frequency and hence not related to lcore cpu frequency to derive into. In this patch, we fix get_tsc_freq() to not depend upon rte_rdtsc(), but obtain cpu current frequency from sysfs.
Signed-off-by: Gowrishankar Muthukrishnan <gowrishanka...@linux.vnet.ibm.com> --- Note: * This patch would need minor port as per below patch (yet to upstream): http://dpdk.org/dev/patchwork/patch/27527/ lib/librte_eal/linuxapp/eal/eal_timer.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/lib/librte_eal/linuxapp/eal/eal_timer.c b/lib/librte_eal/linuxapp/eal/eal_timer.c index afa32f5..b8775cc 100644 --- a/lib/librte_eal/linuxapp/eal/eal_timer.c +++ b/lib/librte_eal/linuxapp/eal/eal_timer.c @@ -55,8 +55,10 @@ #include "eal_private.h" #include "eal_internal_cfg.h" +#include "eal_filesystem.h" enum timer_source eal_timer_source = EAL_TIMER_HPET; +static const char sys_cpu_dir[] = "/sys/devices/system/cpu"; #ifdef RTE_LIBEAL_USE_HPET @@ -269,6 +271,17 @@ struct eal_hpet_regs { uint64_t get_tsc_freq(void) { +#ifdef RTE_ARCH_PPC_64 + unsigned long cpu_hz; + char path[PATH_MAX]; + + snprintf(path, sizeof(path), "%s/cpu%d/cpufreq/cpuinfo_cur_freq", + sys_cpu_dir, rte_get_master_lcore()); + if (eal_parse_sysfs_value(path, &cpu_hz) < 0) + RTE_LOG(WARNING, EAL, "Unable to parse %s\n", + path); + return cpu_hz*1000; +#else #ifdef CLOCK_MONOTONIC_RAW #define NS_PER_SEC 1E9 @@ -290,6 +303,7 @@ struct eal_hpet_regs { return tsc_hz; } #endif +#endif return 0; } -- 1.9.1
