From a58963007a3416b61a72fa3df7e140eca7aa9a87 Mon Sep 17 00:00:00 2001 From: Sitsofe Wheeler Date: Sun, 25 Jun 2017 23:09:07 +0100 Subject: [PATCH] HOWTO: note that crc32c will automatically use hw - Add note that crc32c checksumming will automatically use hardware acceleration if possible. - Add note that crc32c-intel is just a synonym for crc32c. Signed-off-by: Sitsofe Wheeler --- HOWTO | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/HOWTO b/HOWTO index 7dc08e26..2007dc04 100644 --- a/HOWTO +++ b/HOWTO @@ -2373,13 +2373,14 @@ Verification header of each block. **crc32c** - Use a crc32c sum of the data area and store it in the header of each - block. + Use a crc32c sum of the data area and store it in the header of + each block. This will automatically use hardware acceleration + (e.g. SSE4.2 on an x86 or CRC crypto extensions on ARM64) but will + fall back to software crc32c if none is found. Generally the + fatest checksum fio supports when hardware accelerated. **crc32c-intel** - Use hardware assisted crc32c calculation provided on SSE4.2 enabled - processors. Falls back to regular software crc32c, if not supported - by the system. + Synonym for crc32c. **crc32** Use a crc32 sum of the data area and store it in the header of each -- 2.25.1