[dpdk-dev] [RFC v3 1/2] eal: replace libc-based random number generation with LFSR
Mattias Rönnblom
mattias.ronnblom at ericsson.com
Wed May 8 22:30:00 CEST 2019
On 2019-05-08 22:12, Stephen Hemminger wrote:
> On Wed, 24 Apr 2019 14:33:19 +0200
> Mattias Rönnblom <mattias.ronnblom at ericsson.com> wrote:
>
>> diff --git a/lib/librte_eal/linux/eal/eal.c b/lib/librte_eal/linux/eal/eal.c
>> index 161399619..d6bf0e89e 100644
>> --- a/lib/librte_eal/linux/eal/eal.c
>> +++ b/lib/librte_eal/linux/eal/eal.c
>> @@ -1083,8 +1083,6 @@ rte_eal_init(int argc, char **argv)
>> #endif
>> }
>>
>> - rte_srand(rte_rdtsc());
>
> The current model of seeding with TSC will have problems at scale.
> If a whole rack of machines reboots at the same time because of power cycle,
> it would not be surprising if several had the same TSC value.
>
> A better solution would be to use the get_random() system call to get
> seed, the kernel can get entropy from more sources.
>
Sounds reasonable.
What version of FreeBSD is DPDK supposed to support? getrandom(2) (and
its cousin getentropy(3)) seem not be available until FreeBSD 12.
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