Re: [PATCH] migration/throttle: Make throttle slower at tail stage

[zhukeqian]

On 2020/2/14 19:46, Eric Blake wrote:
> On 2/13/20 9:27 PM, Keqian Zhu wrote:
>> At the tail stage of throttle, VM is very sensitive to
>> CPU percentage. We just throttle 30% of remaining CPU
>> when throttle is more than 80 percentage.
>>
>> This doesn't conflict with cpu_throttle_increment.
>>
>> This may make migration time longer, and is disabled
>> by default.
>>
>> Signed-off-by: Keqian Zhu <address@hidden>
>> ---
>> Cc: Juan Quintela <address@hidden>
>> Cc: "Dr. David Alan Gilbert" <address@hidden>
>> Cc: Eric Blake <address@hidden>
>> Cc: Markus Armbruster <address@hidden>
> 
>> +++ b/qapi/migration.json
>> @@ -532,6 +532,12 @@
>>   #                          auto-converge detects that migration is not 
>> making
>>   #                          progress. The default value is 10. (Since 2.7)
>>   #
>> +# @cpu-throttle-tailslow: Make throttle slower at tail stage
>> +#                         At the tail stage of throttle, VM is very 
>> sensitive to
>> +#                         CPU percentage. We just throttle 30% of remaining 
>> CPU
>> +#                         when throttle is more than 80 percentage. The 
>> default
>> +#                         value is false. (Since 4.1)
> 
> The next release is 5.0, not 4.1.
Thanks for reminding me.
> 
Thanks,
Keqian