From aa75fc9db6b98ad317911b35b4a968139a648bb8 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Fri, 1 Jul 2022 15:02:06 -0600 Subject: [PATCH] lib/rand: improve __fill_random_buf() This won't be equivalent to what we have, but I _think_ the randomness is good enough for this purpose. This improves performance by about 30% for me, tested on both aarch64 and x86-64. Signed-off-by: Jens Axboe --- lib/rand.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/lib/rand.c b/lib/rand.c index 2243c2b4..1df1a7a0 100644 --- a/lib/rand.c +++ b/lib/rand.c @@ -103,8 +103,7 @@ void __fill_random_buf(void *buf, unsigned int len, uint64_t seed) for (; b != e; ++b) { *b = seed; - seed *= GOLDEN_RATIO_PRIME; - seed >>= 3; + seed *= GOLDEN_RATIO_64; } if (fio_unlikely(rest)) -- 2.25.1