From: Jens Axboe <axboe@fb.com>
Date: Sun, 28 Sep 2014 03:29:03 +0000 (-0600)
Subject: t/dedupe: fixup bloom entry calculation
X-Git-Tag: fio-2.1.13~18
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=bc095aab789a2e7d036c6d499f6c124a0c2d5de0;p=fio.git

t/dedupe: fixup bloom entry calculation

With m/n at 8x and with 5 default hashes for blooming, we should
be around ~2% false positive rate max.

Signed-off-by: Jens Axboe <axboe@fb.com>
---

diff --git a/t/dedupe.c b/t/dedupe.c
index 12ede8f0..f9fb8c4a 100644
--- a/t/dedupe.c
+++ b/t/dedupe.c
@@ -452,7 +452,7 @@ static int dedupe_check(const char *filename, uint64_t *nextents,
 	if (use_bloom) {
 		uint64_t bloom_entries;
 
-		bloom_entries = (3 * dev_size ) / (blocksize * 2);
+		bloom_entries = 8 * (dev_size / blocksize);
 		bloom = bloom_new(bloom_entries);
 	}