common/config_opts: Better rocksdb cache size description.

Signed-off-by: Mark Nelson <mnelson@redhat.com>

diff --git a/src/common/config_opts.h b/src/common/config_opts.h
index c3626517ab9440d762a9c41403ac129c3e334810..da0f6e80b1cbaa205ecd8902fce249e47c494499 100644 (file)
--- a/src/common/config_opts.h
+++ b/src/common/config_opts.h
@@ -969,7 +969,7 @@ OPTION(kinetic_use_ssl, OPT_BOOL, false) // whether to secure kinetic traffic wi
 OPTION(rocksdb_separate_wal_dir, OPT_BOOL, false) // use $path.wal for wal
 SAFE_OPTION(rocksdb_db_paths, OPT_STR, "")   // path,size( path,size)*
 OPTION(rocksdb_log_to_ceph_log, OPT_BOOL, true)  // log to ceph log
-OPTION(rocksdb_cache_size, OPT_U64, 128*1024*1024)  // default rocksdb cache size
+OPTION(rocksdb_cache_size, OPT_U64, 128*1024*1024)  // rocksdb cache size (unless set by bluestore/etc)
 OPTION(rocksdb_cache_row_ratio, OPT_FLOAT, 0)   // ratio of cache for row (vs block)
 OPTION(rocksdb_cache_shard_bits, OPT_INT, 4)  // rocksdb block cache shard bits, 4 bit -> 16 shards
 OPTION(rocksdb_cache_type, OPT_STR, "lru") // 'lru' or 'clock'