Performance test about HBase Bucket Cache

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hi all,

Recently we are trying to test hbase bucket cache, we use PCIE card (1.1T) for 
L2 cache，
and our configuration like below:

<property>
        <name>hbase.bucketcache.ioengine</name>
        <value>file:/export/hbase/bucketcache.data</value>
</property>
<property>
        <name>hbase.bucketcache.size</name>
        <value>921600</value>
</property>
<property>
        <name>hbase.bucketcache.combinedcache.enabled</name>
        <value>false</value>
</property>

We use YCSB workloadb (Read/update ratio: 95/5) do the test, but we got a less 
Throughput(ops/sec)
than STAT disk without BucketCache.

So I want to know if there is a detailed bucket cache performance test paper 
which i can refer to.