Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1504942

Re: [4.9-rc1] Build-time 2x slower

Show all headers | View raw

2016-10-20 13:14 GMT+02:00 Rafael J. Wysocki <rjw@rjwysocki.net>:
> On Thursday, October 20, 2016 09:57:45 AM Jörg Otte wrote:
>> 2016-10-19 22:55 GMT+02:00 Rafael J. Wysocki <rjw@rjwysocki.net>:
>> > On Wednesday, October 19, 2016 06:59:35 PM Jörg Otte wrote:
>> >> 2016-10-19 17:29 GMT+02:00 Linus Torvalds <torvalds@linux-foundation.org>:
>> >> > On Wed, Oct 19, 2016 at 4:07 AM, Jörg Otte <jrg.otte@gmail.com> wrote:
>> >> >>
>> >> >> Additional info: I usally use schedutil governor.
>> >> >> If I switch to performance governor problems go away.
>> >> >> Maybe a cpufreq problem?
>> >> >
>> >> > Oh, I completely misread the original bug report, and then didn't read
>> >> > your confirmation email right.
>> >> >
>> >> > I thought you had a slower build of the different kernels (when
>> >> > building on the same kernel), and that the _build_ itself had slowed
>> >> > down for some reason. But you're actually saying that doing the _same_
>> >> > build actually takes longer when running on 4.9-rc1.
>> >>
>> >> Exactly!
>> >>
>> >> Btw: ondemand governor is also good.
>> >>
>> >> > There are a few small cpufreq changes there in between commit
>> >> > 29fbff8698fc (that you reported was fine - please tell me I got _that_
>> >> > right, at least?) and 4.9-rc1.
>> >>
>> >> Perfect! That's what I mean.
>> >>
>> >> > Adding Rafael to the cc.
>> >> >
>> >> > That said, none of them look all that likely to me. It *would* be good
>> >> > if you could bisect it a bit (perhaps not fully, but a couple of
>> >> > bisection steps to narrow down what area it is).
>> >>
>> >> I try that tomorrow.
>> >
>> > Well, please try commit ef98988ba369 (Merge tag 'pm-extra-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm) which is the
>> > merge introducing the late cpufreq changes.  If the issue is there, please
>> > try to revert commit 899bb6642f2a (cpufreq: skip invalid entries when searching
>> > the frequency) which is the only cpufreq one that may matter for the schedutil
>> > governor (and I have one fix for that commit queued up already).
>> >
>>
>> I first tried the merge but git said I'm already uptodate (my tree
>> is at 1a1891d Merge tag 'for-f2fs-4.9-rc2' of
>> git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs already)
>>
>> Then I did the revert of 899bb6642f2a and
>> that worked fine for me.
>
> OK, thanks!
>
> Pointer arithmetics is messed up in that commit somewhat which may be the
> reason for what you see.
>
> Please check if this patch helps (instead of the revert):
>
> https://patchwork.kernel.org/patch/9379639/
>
Yes, works well for me.

Thanks, Jörg

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: [4.9-rc1] Build-time 2x slower Ming Lei <tom.leiming@gmail.com> - 2016-10-18 03:40 +0200
  Re: [4.9-rc1] Build-time 2x slower Sedat Dilek <sedat.dilek@gmail.com> - 2016-10-18 11:40 +0200
    Re: [4.9-rc1] Build-time 2x slower Jörg Otte <jrg.otte@gmail.com> - 2016-10-18 19:00 +0200
      Re: [4.9-rc1] Build-time 2x slower Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-18 19:20 +0200
        Re: [4.9-rc1] Build-time 2x slower Jörg Otte <jrg.otte@gmail.com> - 2016-10-19 17:30 +0200
          Re: [4.9-rc1] Build-time 2x slower Linus Torvalds <torvalds@linux-foundation.org> - 2016-10-19 17:30 +0200
            Re: [4.9-rc1] Build-time 2x slower Jörg Otte <jrg.otte@gmail.com> - 2016-10-19 19:00 +0200
              Re: [4.9-rc1] Build-time 2x slower "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-10-19 22:50 +0200
                Re: [4.9-rc1] Build-time 2x slower Sedat Dilek <sedat.dilek@gmail.com> - 2016-10-20 09:50 +0200
                Re: [4.9-rc1] Build-time 2x slower "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-10-20 13:10 +0200
                Re: [4.9-rc1] Build-time 2x slower "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-10-20 16:30 +0200
                Re: [4.9-rc1] Build-time 2x slower Sedat Dilek <sedat.dilek@gmail.com> - 2016-10-20 16:40 +0200
                Re: [4.9-rc1] Build-time 2x slower "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-10-20 16:50 +0200
                Re: [4.9-rc1] Build-time 2x slower Sedat Dilek <sedat.dilek@gmail.com> - 2016-10-21 03:00 +0200
                Re: [4.9-rc1] Build-time 2x slower Sedat Dilek <sedat.dilek@gmail.com> - 2016-10-20 16:30 +0200
                Re: [4.9-rc1] Build-time 2x slower Jörg Otte <jrg.otte@gmail.com> - 2016-10-20 10:00 +0200
                Re: [4.9-rc1] Build-time 2x slower Sedat Dilek <sedat.dilek@gmail.com> - 2016-10-20 10:10 +0200
                Re: [4.9-rc1] Build-time 2x slower "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-10-20 13:10 +0200
                Re: [4.9-rc1] Build-time 2x slower Jörg Otte <jrg.otte@gmail.com> - 2016-10-20 16:40 +0200
                Re: [4.9-rc1] Build-time 2x slower "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-10-20 16:50 +0200
              Re: [4.9-rc1] Build-time 2x slower Sedat Dilek <sedat.dilek@gmail.com> - 2016-10-20 09:30 +0200
            Re: [4.9-rc1] Build-time 2x slower Sedat Dilek <sedat.dilek@gmail.com> - 2016-10-20 09:50 +0200

csiph-web