From: "Kasagar, Srinidhi" <srinidhi.kasagar@intel.com>
To: Len Brown <lenb@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
"Brown, Len" <len.brown@intel.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Linux PM list <linux-pm@vger.kernel.org>,
vishwesh.m.rudramuni@intel.com, srinidhi.kasagar@intel.com
Subject: Re: [PATCH v7] cpufreq: Add SFI based cpufreq driver support
Date: Tue, 16 Dec 2014 15:54:44 +0530 [thread overview]
Message-ID: <20141216102444.GA16158@intel-desktop> (raw)
In-Reply-To: <CAJvTdKmCwJTWE4t9YuWn+OLxG5EWZDXo5LZ1Bxq45ECiOvQmsA@mail.gmail.com>
On Tue, Dec 16, 2014 at 03:15:33AM -0500, Len Brown wrote:
[...]
> replace line above with...
>
> policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
But we know the transition latency of this system. Why should we
claim it as "unknown"? The sfi_freq_table_entry has latency
field - does it not make irrelevant then?
>
> ondemand will compare this to TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000)
> and since -1 is less than 10,000,000; it will be happy.
>
> > + for (i = 0; i < num_freq_table_entries; i++) {
> > + /* detect transition latency */
> > + if ((sfi_cpufreq_array[i].latency * 1000) >
> > + policy->cpuinfo.transition_latency)
> > + policy->cpuinfo.transition_latency =
> > + sfi_cpufreq_array[i].latency * 1000;
>
> delete above 5 lines. every SFI system will have latency
> plenty lower than that required by ondemand governor.
Srinidhi
next prev parent reply other threads:[~2014-12-16 10:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-11 8:14 [PATCH v7] cpufreq: Add SFI based cpufreq driver support Srinidhi Kasagar
2014-12-11 8:22 ` Viresh Kumar
2014-12-11 9:13 ` Kasagar, Srinidhi
2014-12-16 8:15 ` Len Brown
2014-12-16 10:24 ` Kasagar, Srinidhi [this message]
2014-12-17 22:12 ` Len Brown
2014-12-18 6:44 ` Kasagar, Srinidhi
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