On Mon, Mar 26, 2018 at 05:33:47PM +0200, Willy Tarreau wrote: > > red line is 'sys' cpu time > > green line is 'user' cpu time > > This is very useful, thank you. I'm seeing overall that when you're on > 1.7.10+kqueue and 1.8.5+poll the overall %user is the same. However > it's the system which makes a huge difference there (to be expected > with poll under load). However things are highly different when you > run with kqueue, this seems to indicate that we may be missing some > events in the kqueue loop or that we need multiple calls for some of > them to be processed, causing some suboptimal behaviour. There is > some important locking in 1.8 to deal with the fd cache which has been > revisited differently in 1.9. And the differences are important enough > not to be realisticly backportable. So it may be possible that what you > observe is a limit of the current 1.8 code, though we'll take a closer > look in case we find something. However since we haven't yet heard of > anything similar affecting epoll, it possibly is an issue affecting > only the kqueue code, so there's hope that we can spot something there.
I am try 1.8.7 anf got same issuse.
