doc: remove obsolete performance comment

sha512sum can be faster than sha256sum.
E.g., ‘dd if=/dev/zero bs=1024k count=1024 | time sha256sum’
reports 8.16 user CPU seconds on my host, whereas sha512sum
consumes 5.45 seconds (Fedora x86-64 on an AMD Phenom II X4 910e).
Although sha512sum is still considerably slower on x86, a good
chunk of uses are on 64-bit hosts and anyway there’s little point
to scaring people away from sha512sum nowadays.
* doc/coreutils.texi (sha2 utilities): Remove obsolete comment.

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index a029ec6c83a921ffee8bb45bba3c457cc4abffd4..c988aca4f2b5610bfc462bfa11d23928afecbc8b 100644 (file)
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -3948,9 +3948,6 @@ these commands are precisely the same as for @command{md5sum}
 and @command{sha1sum}.
 @xref{md5sum invocation}.
 
-Note: The SHA384 and SHA512 digests are considerably slower to
-compute, especially on 32-bit computers, than SHA224 or SHA256.
-
 
 @node Operating on sorted files
 @chapter Operating on sorted files