> On 6. Aug 2018, at 23:18, Mindaugas Rasiukevicius <rm...@netbsd.org> wrote: > > Martin Husemann <mar...@duskware.de> wrote: >> So here is a more detailed analyzis using flamegraphs: >> >> https://netbsd.org/~martin/bc-perf/ >> >> >> All operations happen on tmpfs, and the locking there is a significant >> part of the game - however, lots of mostly idle time is wasted and it is >> not clear to me what is going on. > > Just from a very quick look, it seems like a regression introduced with > the vcache changes: the MP-safe flag is set too late and not inherited > by the root vnode. > > http://www.netbsd.org/~rmind/tmpfs_mount_fix.diff
Very good catch, @martin could you try this diff on an autobuilder? Looks like it speeds up tmpfs lookups by a factor of ~40 on -8.0. -- J. Hannken-Illjes - hann...@eis.cs.tu-bs.de - TU Braunschweig (Germany)
