[PATCH v3 0/6] 32bit ARM branch predictor hardening

[Hanjun Guo]

On 2018/1/29 22:58, Nishanth Menon wrote:
> On Mon, Jan 29, 2018 at 5:36 AM, Hanjun Guo <guohanjun at huawei.com> wrote:
> [...]
> 
>> By the way, this patch set just enable branch predictor hardening
>> on arm32 unconditionally, but some of machines (such as wireless
>> network base station) will not be exposed to user to take advantage
>> of variant 2, and those machines will be pretty sensitive for
>> performance, so can we introduce Kconfig or boot option to disable
>> branch predictor hardening as an option?
> 
> I am curious: Have you seen performance degradation with this series?
> If yes, is it possible to share the information?

Sorry for the late reply, the performance data for context switch (CFS)
is about 6%~12% drop (A9 based machine) for the first around test, but
the data is not stable, I need to retest then I will update here.

Thanks
Hanjun