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    SubjectRe: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel
    Hi Peter,

    the performance regression has been caused by this commit

    =================================================
    commit 6ecdd74962f246dfe8750b7bea481a1c0816315d
    Author: Yuyang Du <yuyang.du@intel.com>
    Date: Tue Apr 5 12:12:26 2016 +0800

    sched/fair: Generalize the load/util averages resolution definition
    =================================================

    Could you please have a look?

    Thanks a lot!
    Jirka


    On Wed, Jun 22, 2016 at 9:54 AM, Peter Zijlstra <peterz@infradead.org> wrote:
    > On Wed, Jun 22, 2016 at 09:49:41AM +0200, Peter Zijlstra wrote:
    >> On Wed, Jun 22, 2016 at 09:16:01AM +0200, Peter Zijlstra wrote:
    >> > WTF a benchmark needs that crap is beyond me, but whatever, I have
    >> > numbers.
    >>
    >> Oh, shaft me harder, its XML shite :/ How is a sane person ever going to
    >> get numbers out.
    >>
    >> I'm >.< close to giving up on this site and declaring the thing
    >> -EDONTCARE.
    >
    > OK, done.. have a look at this:
    >
    >
    > /tmp/SPECjvm2008/compiler.compiler/compiler/src/share/classes/javax/lang/model/element/Name.java:54: cannot access java.lang.CharSequence
    > bad class file: spec.benchmarks.compiler.SpecFileManager$CachedFileObject@1c06fce6
    > bad constant pool tag: 18 at 10
    > Please remove or make sure it appears in the correct subdirectory of the classpath.
    > public interface Name extends CharSequence {
    > ^
    > ERROR: compiler exit code: 1
    >
    > Warmup (120s) begins: Wed Jun 22 09:45:33 CEST 2016
    > /tmp/SPECjvm2008/compiler.compiler/compiler/src/share/classes/javax/lang/model/element/Name.java:54: cannot access java.lang.CharSequence
    > bad class file: spec.benchmarks.compiler.SpecFileManager$CachedFileObject@1c06fce6
    > bad constant pool tag: 18 at 10
    > Please remove or make sure it appears in the correct subdirectory of the classpath.
    > public interface Name extends CharSequence {
    > ^
    > /tmp/SPECjvm2008/compiler.compiler/compiler/src/share/classes/javax/lang/model/element/Name.java:54: cannot access java.lang.CharSequence
    > bad class file: spec.benchmarks.compiler.SpecFileManager$CachedFileObject@1c06fce6
    > bad constant pool tag: 18 at 10
    > Please remove or make sure it appears in the correct subdirectory of the classpath.
    >
    >
    >
    > Clearly this stuff just isn't made to be used.
    >
    >
    > /me goes do something useful.

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