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