The Completely Fair Queuing (cfq) scheduler in Red Hat Enterprise Linux 5 appears to have worse I/O read performance thanin version 4. Why?
Updated -
Release Found: Red Hat Enterprise Linux 5
This is a known issue and Red Hat is working diligently on a resolution. It appears as though the Completely Fair Queuing I/O scheduler (cfq) has a regression and thus exhibits reduced read-side throughput which can affect performance for both local and NFS mounted file systems.
There are two known ways to mitigate this s...
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