[Bug 2150] New: #AC split lock caused by exception handler #ac
bugzilla-daemon at bugzilla.tianocore.org...
Bug ID: 2150
Summary: #AC split lock caused by exception handler
#AC split locks stalls have a heavy cost on execution time, even when only
running on one active core.
#AC split lock is being caused in
sidt saves 8-byte base and 2-byte limit to memory. xchg is used to separate
limit and base. sgdt saves 8-byte base and 2-byte limit to memory. xchg is
used to separate limit and base. xchg is atomic so if it operand crosses cache
line it will cause a #AC split lock. To stop it from crossing cache line, we
can use xchg with 32-bit operand instead of 64-bit operand to separate base and
You are receiving this mail because:
You are on the CC list for the bug.