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| author | markm <markm@FreeBSD.org> | 2000-12-02 18:40:16 +0000 |
|---|---|---|
| committer | markm <markm@FreeBSD.org> | 2000-12-02 18:40:16 +0000 |
| commit | d04b66b7bc8243e8d0f41b0ec49287b046f7896c (patch) | |
| tree | f123c1e3fe2e6c36575c949b3c4e3a8f437dd3f3 /sys/dev/random/yarrow.h | |
| parent | b60dc7dc10282b413955e91ef34b45d89861e2b0 (diff) | |
| download | FreeBSD-src-d04b66b7bc8243e8d0f41b0ec49287b046f7896c.zip FreeBSD-src-d04b66b7bc8243e8d0f41b0ec49287b046f7896c.tar.gz | |
Major speedup to /dev/random and the kernel thread that reseeds it.
There is no more TAILQ fifo to harvest the entropy; instead, there
is a circular buffer of constant size (changeable by macro) that
pretty dramatically improves the speed and fixes potential slowdowns-
by-locking.
Also gone are a slew of malloc(9) and free(9) calls; all harvesting
buffers are static.
All-in-all, this is a good performance improvement.
Thanks-to: msmith for the circular buffer concept-code.
Diffstat (limited to 'sys/dev/random/yarrow.h')
| -rw-r--r-- | sys/dev/random/yarrow.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/dev/random/yarrow.h b/sys/dev/random/yarrow.h index 49cc602..964ae65 100644 --- a/sys/dev/random/yarrow.h +++ b/sys/dev/random/yarrow.h @@ -31,7 +31,7 @@ * an enum in sys/random.h */ -#define ENTROPYBIN 256 /* buckets to harvest entropy events */ +#define HARVEST_RING_SIZE 1024 /* harvest ring buffer size */ #define TIMEBIN 16 /* max value for Pt/t */ #define HARVESTSIZE 16 /* max size of each harvested entropy unit */ |
