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We saw a regression of flow setup rate with Open vSwitch. For a single
VM and one netperf session, previously we got ~4000 connection per
second. Now we can only get ~2500. We saw this is only for Intel NICs.
Broadcom NIC shows the same performance as before.
The regression seems associated with the kernel. We are using Linux
3.2.0-61-generic. For default Intel NIC driver is 3.6.7-k, if we want to
upgrade the intel driver to support UDP rx-flow-hash, we need to install:
linux-backports-modules-net-3.2.0-61-generic
After updating the Intel driver to 3.8.21-NAPI, we got ~2500 cps for flow setup
rate with one session in one vm. So I purged
"linux-backports-modules-net-3.2.0-61-generic" and used the default Intel
driver. Then the flow setup rate gets back to ~4000 tps.
With the linux-backports-module-net-3.2.0-58-generic, we saw no such
regression with either Intel driver.
** Affects: linux (Ubuntu)
Importance: Medium
Status: New
** Tags: bot-comment
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Regression in Ubuntu 3.2.0.61 w/ Intel 3.8 driver
https://bugs.launchpad.net/bugs/1321035
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