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Diffstat (limited to 'sys/dev/random/harvest.c')
| -rw-r--r-- | sys/dev/random/harvest.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/dev/random/harvest.c b/sys/dev/random/harvest.c index 0ffa83e..d783065 100644 --- a/sys/dev/random/harvest.c +++ b/sys/dev/random/harvest.c @@ -77,6 +77,10 @@ random_yarrow_deinit_harvester(void) * not do anything slow in here! * Implemented as in indirect call to allow non-inclusion of * the entropy device. + * + * XXXRW: get_cyclecount() is cheap on most modern hardware, where cycle + * counters are built in, but on older hardware it will do a real time clock + * read which can be quite expensive. */ void random_harvest(void *entropy, u_int count, u_int bits, u_int frac, |
