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Created attachment 483475 [details] script for system preparing Description of problem: Network throughput regression on Intel 82599EB 10-Gigabit NIC Version-Release number of selected component (if applicable): Linux hp-dl380g7-01.lab.eng.brq.redhat.com 2.6.32-119.el6.x86_64 #1 SMP Tue Mar 1 17:54:42 EST 2011 x86_64 x86_64 x86_64 GNU/Linux How reproducible: 100% Steps to Reproduce: 1.provision hp-dl380g7-01.lab.eng.brq.redhat.com and hp-dl385g7-01.lab.eng.brq.redhat.com with rhel6.1 2.run prepare_sys.py (attached) on both systems. 3. run netperf benchmark https://brewweb.devel.redhat.com/buildinfo?buildID=135954 netperf -H 127.0.0.1 -- -m 1000 (-m 1000 means, that we will be sending 1000byte long messages) 4. run 24 parralel instances of netperf benchmark for i in `seq 1 24`; do netperf -H 127.0.0.1 -P0 -- -m 100 | awk '{print $5}' & done and sum throughput. Actual results: With single instance sending 1000byte long messages we have only ~79% of rhel6.0 performance. Please see: http://download.englab.brq.redhat.com/perf-results//netperf/RHEL61-20110304/#t4_172-16-29-10_to_172-16-29-20 With 24 concurrent instances we have only 75% of rhel6.0. Please see more detailed results. http://download.englab.brq.redhat.com/perf-results//netperf/RHEL61-20110304/#t4_multi_172-16-29-10_to_172-16-29-20 Expected results: Performance improved to 6.0 levels Additional info: I can provide access to those systems and also help with configuration
This does not exercise the network devices at all as you are connecting to an IP address local to the system (127.0.0.1 in this case). Please reopen if you can find benchmarks that indicate that RHEL6.1 has lower stack performance than RHEL6.0 and assign this to someone on Linda Wang's team as her team handles issues that are not networking hardware specific.