On Mon, Apr 23, 2018 at 09:10:33PM +0800, Aaron Lu wrote: > On Mon, Apr 23, 2018 at 11:54:57AM +0300, Tariq Toukan wrote: > > Hi, > > > > I ran my tests with your patches. > > Initial BW numbers are significantly higher than I documented back then in > > this mail-thread. > > For example, in driver #2 (see original mail thread), with 6 rings, I now > > get 92Gbps (slightly less than linerate) in comparison to 64Gbps back then. > > > > However, there were many kernel changes since then, I need to isolate your > > changes. I am not sure I can finish this today, but I will surely get to it > > next week after I'm back from vacation. > > > > Still, when I increase the scale (more rings, i.e. more cpus), I see that > > queued_spin_lock_slowpath gets to 60%+ cpu. Still high, but lower than it > > used to be. > > I wonder if it is on allocation path or free path? Just FYI, I have pushed two more commits on top of the branch. They should improve free path zone lock contention for MIGRATE_UNMOVABLE pages(most kernel code alloc such pages), you may consider apply them if free path contention is a problem.
