> I would like a review of an update to the GCM code. A recent report showed > that GCM memory usage for TLS was very large. This was a result of in-place > buffers, which TLS uses, and how the code handled the combined intrinsic > method during decryption. A temporary buffer was used because the combined > intrinsic does gctr before ghash which results in a bad tag. The fix is to > not use the combined intrinsic during in-place decryption and depend on the > individual GHASH and CounterMode intrinsics. Direct ByteBuffers are not > affected as they are not used by the intrinsics directly. > > The reduction in the memory usage boosted performance back to where it was > before despite using slower intrinsics (gctr & ghash individually). The > extra memory allocation for the temporary buffer out-weighted the faster > intrinsic. > > > JDK 17: 122913.554 ops/sec > JDK 19: 94885.008 ops/sec > Post fix: 122735.804 ops/sec > > There is no regression test because this is a memory change and test coverage > already existing.
Anthony Scarpino has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 443 commits: - Merge branch 'master' into gcm - merge with direct change - 8298142: Update internal comment on language features in SourceVersion Reviewed-by: sundar, jlahoda - 8297379: Enable the ByteBuffer path of Poly1305 optimizations Reviewed-by: sviswanathan, ascarpino, jnimeh - 8297602: Compiler crash with type annotation and generic record during pattern matching Reviewed-by: jlahoda - 8297687: new URI(S,S,S,S) throws exception with incorrect index position reported in the error message Reviewed-by: jpai - 8298145: Remove ContiguousSpace::capacity Reviewed-by: tschatzl - merge with direct - 8297186: G1 triggers unnecessary full GCs when heap utilization is low Reviewed-by: kbarrett, sjohanss - 8297172: Fix some issues of auto-vectorization of `Long.bitCount/numberOfTrailingZeros/numberOfLeadingZeros()` Reviewed-by: kvn, thartmann - ... and 433 more: https://git.openjdk.org/jdk/compare/ea83cb96...c3d94670 ------------- Changes: https://git.openjdk.org/jdk/pull/11121/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11121&range=05 Stats: 80 lines in 1 file changed: 46 ins; 1 del; 33 mod Patch: https://git.openjdk.org/jdk/pull/11121.diff Fetch: git fetch https://git.openjdk.org/jdk pull/11121/head:pull/11121 PR: https://git.openjdk.org/jdk/pull/11121
