Re: [dpdk-dev] [PATCH v3 3/3] test/power: add delay before checking cpuinfo cur freq

[Richael Zhuang <Richael.Zhuang@arm.com>]

Hi Liang,
Sorry that last email contains "confidential notice", so I resend it.
> -----Original Message-----
> From: Liang Ma <liangma@liangbit.com>
> Sent: Wednesday, April 7, 2021 6:15 PM
> To: Richael Zhuang <Richael.Zhuang@arm.com>
> Cc: dev@dpdk.org; alan.carew@intel.com; stable@dpdk.org; David Hunt
> <david.hunt@intel.com>; Pablo de Lara <pablo.de.lara.guarch@intel.com>
> Subject: Re: [dpdk-dev] [PATCH v3 3/3] test/power: add delay before
> checking cpuinfo cur freq
> On Wed, Apr 07, 2021 at 03:46:36PM +0800, Richael Zhuang wrote:
> > 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.
> >
> > Fixes: ed7c51a6a680 ("app/test: vm power management")
> > Cc: alan.carew@intel.com
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Richael Zhuang <richael.zhuang@arm.com>
> > ---
> >  app/test/test_power_cpufreq.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/app/test/test_power_cpufreq.c
> > b/app/test/test_power_cpufreq.c index cda74bd8a..7a93bc90a 100644
> > --- a/app/test/test_power_cpufreq.c
> > +++ b/app/test/test_power_cpufreq.c
> > @@ -47,6 +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);
> Hi Richael,
>   1 second looks way too much for CPU frequency  swap.
>   The unit should be ms in the worst case regardless the vendor, IMO.
> Regards
> Liang
Thanks for review. Although I also think this time seems too long,
it needs more than 700ms when I tested on our arm platform.
> > +
> >  #define TEST_POWER_CONVERT_TO_DECIMAL 10
> >  FILE *f;
> >  char fullpath[PATH_MAX];
> > --
> > 2.20.1
> >
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