Ingo Molnar wrote:
( another advantage is that the 6 bytes GDT descriptor is more compressed and hence uses up less L1/L2 cache footprint than the larger (~7 byte) trampolines we have at the moment. )
Also its D cache rather than I cache, which is generally more plentiful. However, I think the cost of GDT cache misses on exception latency is something that we've largely overlooked, and this will make it a bigger factor (vs cache misses on the actual exception handler code itself, which should be reduced).
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