-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 3h 44m 39s (1M q [140.030 qps], 61K conn, TX: 3G, RX: 1G)
[--] Reads / Writes: 13% / 87%
[--] Binary logging is disabled
[--] Physical Memory     : 5.8G
[--] Max MySQL memory    : 2.2G
[--] Other process memory: 790.3M
[--] Total buffers: 800.0M global + 4.7M per thread (300 max threads)
[--] P_S Max memory usage: 0B
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 1.5G (25.13% of installed RAM)
[OK] Maximum possible memory usage: 2.2G (36.88% of installed RAM)
[OK] Overall possible memory usage with other process is compatible with memory available
[OK] Slow queries: 0% (3K/1M)
[OK] Highest usage of available connections: 50% (150/300)
[OK] Aborted connections: 0.00%  (0/61343)
[!!] Query cache may be disabled by default due to mutex contention.
[OK] Query cache efficiency: 50.9% (217K cached / 426K selects)
[OK] Query cache prunes per day: 0
[OK] Sorts requiring temporary tables: 0% (67 temp sorts / 30K sorts)
[!!] Joins performed without indexes: 19904
[OK] Temporary tables created on disk: 15% (1K on disk / 12K total)
[OK] Thread cache hit rate: 87% (7K created / 61K connections)
[OK] Table cache hit rate: 32% (345 open / 1K opened)
[OK] Open file limit used: 27% (412/1K)
[!!] Table locks acquired immediately: 54%

query_cache_size = 128M
sort_buffer_size = 4M
key_buffer = 512M

$ free -m
              total      used       free     shared    buffers     cached
Mem:          5981       2420       3561         36         52       1095