[PATCH]x86: update REP_STOSB_THRESHOLD's default value from 2k to 1M

[Qingqing Li]

OK,  thanks.

On 2020/12/21 12:38, Siddhesh Poyarekar wrote:
> On 5/23/20 9:40 AM, liqingqing wrote:
>> this commitid 830566307f038387ca0af3fd327706a8d1a2f595 optimize implementation of function memset,
>> and set macro REP_STOSB_THRESHOLD's default value to 2KB, when the input value is less than 2KB, the data flow is the same, and when the input value is large than 2KB,
>> this api will use STOB to instead of  MOVQ
>>
>> but when I test this API on x86_64 platform
>> and found that this default value is not appropriate for some input length. here it's the enviornment and result
>
> This patch is not needed anymore since the threshold has been made a tunable: glibc.cpu.x86_rep_movsb_threshold.
>
> Siddhesh
> .