From 213c397492bdc64cf26b2e7b3877e4a29dc9f8da Mon Sep 17 00:00:00 2001 From: Stefano Brivio Date: Mon, 28 Feb 2022 16:18:44 +0100 Subject: passt, pasta: Run-time selection of AVX2 build Build-time selection of AVX2 flags and routines is not practical for distributions, but limiting AVX2 usage to checksum routines with specific run-time detection doesn't allow for easy performance gains from auto-vectorisation of batched packet handling routines. For x86_64, build non-AVX2 and AVX2 binaries, and implement a simple wrapper replacing the current executable with the AVX2 build if it's available, and if AVX2 is supported by the current CPU. Signed-off-by: Stefano Brivio --- README.md | 28 +++++++++++----------------- 1 file changed, 11 insertions(+), 17 deletions(-) (limited to 'README.md') diff --git a/README.md b/README.md index 14e1777..4966e15 100644 --- a/README.md +++ b/README.md @@ -220,7 +220,7 @@ speeding up local connections, and usually requiring NAT. _pasta_: * Linux * ✅ starting from 4.18 kernel version * ✅ starting from 3.13 kernel version -* 🛠 build-time selection of AVX2 instructions (as much as possible) +* ✅ run-time selection of AVX2 build * ⌚ [_musl_](https://bugs.passt.top/show_bug.cgi?id=4) and [_uClibc-ng_](https://bugs.passt.top/show_bug.cgi?id=5) * ⌚ [FreeBSD](https://bugs.passt.top/show_bug.cgi?id=6), @@ -467,15 +467,12 @@ Test logs [here](/builds/latest/test/). cd passt make - * alternatively, static builds for x86_64, with or without AVX2 instructions, - as of the latest commit are also available for convenience - [here](/builds/latest/x86_64/avx2/) and - [here](/builds/latest/x86_64/). Convenience, non-official - packages for Debian (and derivatives) and RPM-based distributions are also - available there. These binaries and packages are simply built with: + * alternatively, static builds for x86_64 as of the latest commit are also + available for convenience [here](/builds/latest/x86_64/). Convenience, + non-official packages for Debian (and derivatives) and RPM-based + distributions are also available there. These binaries and packages are + simply built with: - CFLAGS="-static" make avx2 - make pkgs make static make pkgs @@ -530,15 +527,12 @@ Test logs [here](/builds/latest/test/). cd passt make - * alternatively, static builds for x86_64, with or without AVX2 instructions, - as of the latest commit are also available for convenience - [here](/builds/latest/x86_64/avx2/) and - [here](/builds/latest/x86_64/). Convenience, non-official - packages for Debian (and derivatives) and RPM-based distributions are also - available there. These binaries and packages are simply built with: + * alternatively, static builds for x86_64 as of the latest commit are also + available for convenience [here](/builds/latest/x86_64/). Convenience, + non-official packages for Debian (and derivatives) and RPM-based + distributions are also available there. These binaries and packages are + simply built with: - CFLAGS="-static" make avx2 - make pkgs make static make pkgs -- cgit v1.2.3