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-n...@kde.org
Reporter: luke-jr+kdeb...@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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