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[PERF]: What to do when your SYSEXIT code has a bug? Set KiFastSystemCallDisable to TRUE so it never gets used. Now, for the first time in 3 years and 3 months (not giving a specific revision # to protect the 'innocent'), ReactOS actually fully uses the SYSENTER/SYSEXIT instructions isntead of IRETD, since my code doesn't exhibit the bug and SYSEXIT is safe to use. This should save a good hundred cycles or more per system call.

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svn path=/trunk/; revision=45271
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Sir Richard
2010-01-26 19:39:21 +00:00
parent dd14b916ff
commit 842d2aa5f9
1 changed files with 1 additions and 1 deletions
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reactos/ntoskrnl/ke/i386/cpu.c
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@@ -27,7 +27,7 @@ ULONG KeProcessorArchitecture;
ULONG KeProcessorLevel;
ULONG KeProcessorRevision;
ULONG KeFeatureBits;
ULONG KiFastSystemCallDisable = 1;
ULONG KiFastSystemCallDisable;
ULONG KeI386NpxPresent = 0;
ULONG KiMXCsrMask = 0;
ULONG MxcsrFeatureMask = 0;