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Benedict commented on CASSANDRA-7938: ------------------------------------- Also file streaming > Releases prior to 2.0 gratuitously invalidate buffer cache > ---------------------------------------------------------- > > Key: CASSANDRA-7938 > URL: https://issues.apache.org/jira/browse/CASSANDRA-7938 > Project: Cassandra > Issue Type: Bug > Components: Core > Reporter: Matt Stump > Fix For: 1.2.19 > > > RandomAccessReader gratuitously invalidates the buffer cache in releases > prior to 2.0. > Additionally, Linux 3.X kernels spend 30% of CPU time in book keeping for the > invalidated pages as captured by CPU flame graphs. > fadvise DONT_NEED should never be called for files other than the commit log > segments. > https://github.com/apache/cassandra/blob/cassandra-2.1/src/java/org/apache/cassandra/io/util/RandomAccessReader.java#L168 -- This message was sent by Atlassian JIRA (v6.3.4#6332)