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List:       kde-bugs-dist
Subject:    [kwin] [Bug 393706] New: New windows cause kwin to eat CPU for 3-4 seconds (fbdev + llvmpipe)
From:       Luke-Jr <bugzilla_noreply () kde ! org>
Date:       2018-04-30 23:28:46
Message-ID: bug-393706-17878 () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=393706

            Bug ID: 393706
           Summary: New windows cause kwin to eat CPU for 3-4 seconds
                    (fbdev + llvmpipe)
           Product: kwin
           Version: unspecified
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: decorations
          Assignee: kwin-bugs-null@kde.org
          Reporter: luke-jr+kdebugs@utopios.org
  Target Milestone: ---

Due to platform issues, the radeon driver crashes my system daily. As a
workaround, so I can get work done, I am stuck using the fbdev Xorg driver.

Everything works great, even 3D games like Jedi Academy are playable (using
llvmpipe 3D rendering on ~13 cores), yet for some reason whenever I open a
window, KWin eats 100% of a single CPU core for a full 3-4 seconds before
drawing the decoration (or allowing any further usage of the GUI). With
multiple windows, I have to wait 3-4 seconds *per window* before the system
responds again - using Xpra to attach to dozens of windows, I have to just go
do something else while I wait.

Compositing is of course disabled.

perf report shows:

Samples: 473K of event 'cycles:ppp', Event count (approx.): 440153905977        
Overhead  Command          Shared Object                     Symbol             
   2.99%  kwin_x11         libLLVMAnalysis.so.5.0.1          [.]
llvm::PointerMayBeCaptured                                                      
   2.06%  kwin_x11         libLLVMCodeGen.so.5.0.1           [.] _init          
   1.86%  kwin_x11         libLLVMSelectionDAG.so.5.0.1      [.] _init          
   1.83%  kwin_x11         libc-2.25.so                      [.] _int_malloc    
   1.65%  kwin_x11         libc-2.25.so                      [.] _int_free      
   1.61%  kwin_x11         libLLVMCore.so.5.0.1              [.] _init          
   1.55%  kwin_x11         libc-2.25.so                      [.] malloc         
   1.35%  kwin_x11         libLLVMAnalysis.so.5.0.1          [.] _init          
   1.31%  kwin_x11         libLLVMSupport.so.5.0.1           [.]
llvm::FoldingSetNodeID::AddInteger                                              
   1.31%  kwin_x11         libc-2.25.so                      [.]
__memcpy_power7                                                                 
   1.02%  kwin_x11         libLLVMSupport.so.5.0.1           [.]
llvm::SmallPtrSetImplBase::FindBucketFor                                        
   0.95%  kwin_x11         libLLVMSupport.so.5.0.1           [.] _init          
   0.93%  kwin_x11         swrastg_dri.so                    [.]
convert_ubyte_rgba_to_bgra                                                      
   0.72%  kwin_x11         libLLVMCodeGen.so.5.0.1           [.]
llvm::LiveIntervalUnion::Query::collectInterferingVRegs                         
   0.60%  kwin_x11         libLLVMCore.so.5.0.1              [.]
llvm::Use::getUser                                                              
   0.58%  kwin_x11         libLLVMCore.so.5.0.1              [.]
llvm::Use::getImpliedUser                                                       
   0.58%  kwin_x11         libLLVMSelectionDAG.so.5.0.1      [.]
llvm::SelectionDAG::computeKnownBits                                            
   0.57%  kwin_x11         libLLVMSupport.so.5.0.1           [.]
llvm::SmallPtrSetImplBase::insert_imp_big                                       
   0.55%  kwin_x11         libLLVMCore.so.5.0.1              [.]
llvm::Type::getPrimitiveSizeInBits                                              
   0.54%  kwin_x11         libLLVMAnalysis.so.5.0.1          [.]
llvm::BasicAAResult::DecomposeGEPExpression

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