Re: performance issues during build.sh -j 40 kernel

[Joerg Sonnenberger <joerg%bec.de@localhost>]

On Sun, Sep 10, 2017 at 07:17:51PM +0200, Joerg Sonnenberger wrote:
> That's true, but changing this also has quite a significant downside on
> some workloads for second order effects. I don't think it is a good idea
> to change this right now, as it doesn't even fix the real problem.

Just to quantify this part, for a current release build on tmpfs, I see:

After:
4267
4280
4261
4247
4300

Before:
3915
3951
3991
3961
3968

After with longer spin off:
4327
4333
4343
4331
4312

Time is in seconds. So adding the cacheline alignment slows the system
down by 8% on average. That's a -j32 release on a dual Xeon.

Joerg