* [dpdk-dev] [Bug 276] rte_rand() bit 31 and 63 are always zero
@ 2019-05-06 13:00 bugzilla
2019-05-06 13:00 ` bugzilla
0 siblings, 1 reply; 2+ messages in thread
From: bugzilla @ 2019-05-06 13:00 UTC (permalink / raw)
To: dev
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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