From: bugzilla@dpdk.org
To: dev@dpdk.org
Subject: [dpdk-dev] [Bug 276] rte_rand() bit 31 and 63 are always zero
Date: Mon, 06 May 2019 13:00:47 +0000 [thread overview]
Message-ID: <bug-276-3@http.bugs.dpdk.org/> (raw)
https://bugs.dpdk.org/show_bug.cgi?id=276
Bug ID: 276
Summary: rte_rand() bit 31 and 63 are always zero
Product: DPDK
Version: 19.05
Hardware: All
OS: All
Status: CONFIRMED
Severity: normal
Priority: Normal
Component: core
Assignee: dev@dpdk.org
Reporter: mattias.ronnblom@ericsson.com
Target Milestone: ---
rte_rand() is specified as returning a 64-bit pseudo-random number, but only
returns 62 bit worth of randomness.
The implementation uses two lrand48() calls, which each returns a 31-bit random
number. This results in bit 31 and 63 always being zero.
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