On 2019-04-10 2:32 p.m., John David Anglin wrote: >> Having one lock shared by all four cores degrades performance >> significantly (30%). > I can believe that. I installed patch on c8000. It reduced my v5.0.7 kernel build time from about 51 to 39 minutes using -j6. So, the speed improvement is definitely there. Dave -- John David Anglin dave.anglin@xxxxxxxx