On Wednesday, November 15, 2017 1:06:12 AM CET Linus Torvalds wrote: > On Tue, Nov 14, 2017 at 4:04 PM, Linus Torvalds > <[email protected]> wrote: > > On Tue, Nov 14, 2017 at 3:53 PM, Thomas Gleixner <[email protected]> wrote: > >> Current head + Raphaels patch: > >> > >> real 0m0.029s > >> user 0m0.000s > >> sys 0m0.010s > >> > >> So that patch is actually slower. > > > > Oh it definitely is expected to be slower, because it does the IPI to > > all the cores and actually gets their frequency right. > > > > It was the old one that we had to revert (because it did so > > sequentially) that was really bad, and took something like 2+ seconds > > on Ingo's 160-core thing, iirc. > > Looked it up. Ingo's machine "only" had 120 cores, and he said > > fomalhaut:~> time cat /proc/cpuinfo >/dev/null > real 0m2.689s > > for the bad serial case, so yeah, it looks "a bit" better than it was ;)
OK, so may I queue it up? I don't think I can get that to work substantially faster anyway ... Thanks, Rafael
