Re: Parallel compilation performance regression

[Matthew Wilcox]

On Thu, Jun 18, 2020 at 11:52:55PM +0000, Derrick, Jonathan wrote:
> Hi David,
> 
> I've been experiencing a performance regression when running a parallel
> compilation (eg, make -j72) on recent kernels.

I bet you're using a version of make which predates 4.3:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ddad21d3e99c743a3aa473121dc5561679e26bb