Description of problem: When running IOZone in distributed mode I am seeing an ~20% performance drop between the glusterfs-3.6.0.24-1.el6rhs.x86_64 and glusterfs-3.6.0.25-1.el6rhs.x86_64 builds. Build Throughput RHS 2.1u2 146,064.29 KB/sec 3.6.0.24 141,667.77 KB/sec 3.6.0.25 111,617.25 KB/sec Version-Release number of selected component (if applicable): glusterfs-3.6.0.25-1.el6rhs.x86_64 How reproducible: I have hit this every time I ran IOZone performance regression tests(5 runs in a row) Steps to Reproduce: 1. Setup 2x2 BAGL cluster with 4 10G clients 2. Run IOZone: iozone -+m /mnt/tests/rhs-tests/beaker/rhs/auto-tests/setup/rhs-setup/clients.ioz -+h gqac006.sbu.lab.eng.bos.redhat.com -C -w -c -e -i 2 -J 3 -+n -r 64k -s 2g -t 16 Actual results: I am seeing a greater than 20% performance regression between builds .24 and .25. Expected results: Performance in line with earlier builds / RHS 2.1u2 Additional info:
I am working on this. I have checked the patches that have gone into version 25, none of them seem to have caused this. I will run the tests on my setup once and check. Also, will check the profile data. Will update soon with findings.
Closing as not a bug.