Медленный innodb

sysbench --test=oltp --oltp-table-size=1000000 --mysql-db=test --mysql-user=root --mysql-password=1 --max-time=4 --oltp-read-only=off --max-requests=0 --num-threads=32 run

gentoo

OLTP test statistics:
    queries performed:
        read:                            109256
        write:                           39020
        other:                           15608
        total:                           163884
    transactions:                        7804   (1946.26 per sec.)
    deadlocks:                           0      (0.00 per sec.)
    read/write requests:                 148276 (36979.02 per sec.)
    other operations:                    15608  (3892.53 per sec.)

Test execution summary:
    total time:                          4.0097s
    total number of events:              7804
    total time taken by event execution: 128.0632
    per-request statistics:
         min:                                  4.42ms
         avg:                                 16.41ms
         max:                                 58.02ms
         approx.  95 percentile:              26.95ms

Threads fairness:
    events (avg/stddev):           243.8750/2.84
    execution time (avg/stddev):   4.0020/0.00

ubuntu

OLTP test statistics:
    queries performed:
        read:                            371784
        write:                           132780
        other:                           53112
        total:                           557676
    transactions:                        26556  (6632.72 per sec.)
    deadlocks:                           0      (0.00 per sec.)
    read/write requests:                 504564 (126021.76 per sec.)
    other operations:                    53112  (13265.45 per sec.)

Test execution summary:
    total time:                          4.0038s
    total number of events:              26556
    total time taken by event execution: 127.7664
    per-request statistics:
         min:                                  1.84ms
         avg:                                  4.81ms
         max:                                191.24ms
         approx.  95 percentile:               8.24ms

Threads fairness:
    events (avg/stddev):           829.8750/12.17
    execution time (avg/stddev):   3.9927/0.00

На генту игрался ядрами, конфигами мускуля, кодировками. Идеи закончились. Куда еще посмотреть?
ps c myisam те же грабли.