lkml.org 
[lkml]   [2022]   [Jul]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] random: vary jitter iterations based on cycle counter speed
Hi Vladimir,

On Wed, Jul 13, 2022 at 03:31:05PM +0100, Vladimir Murzin wrote:
> I've just seen on the platform with slow(ish) timer that it is now considered
> as a source of entropy with samples_per_bit set to 27 (5.19-rc6 has MAX_SAMPLES_PER_BIT
> set to 32). Because of that I see significant delays and I'm trying to understand what
> could be wrong with my setup.
>
> I observe one credit_init_bits(1) call (via entropy_timer()) per ~970 schedule() calls.
> Is that somewhat expected? Does it make sense at all?

How slow are we talking? Seconds? Minutes? Is it too slow? It's possible
that MAX_SAMPLES_PER_BIT=32 is a bit high as a threshold and I should
reduce that a bit.

Also, out of curiosity, why is your timer so slow?

Jason

\
 
 \ /
  Last update: 2022-07-13 16:41    [W:0.075 / U:3.696 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site