Significantly reduced I/O throughput and increased swap use after kernel upgrade

Solution Verified - Updated -

Issue

  • A server was upgraded to 2.6.32-358 last Friday. Immediately after the reboot, the load average was around 4 and it climbed slowly over the weekend to about 80. The server became progressively unresponsive and unable to start new processes or accept new connections.
  • Reverted to 2.6.32-279 and the issue disappeared.

Environment

  • Red Hat Enterprise Linux, version 6
  • Kernel >= 2.6.32-358.el6.x86_64

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