RHEL7: iperf performance with 2 streams from different machines is inconsistent
Issue
- Consistent network packet retries; Re-transmit timeouts; Loss of network bandwidth between servers.
- Expectation: We expect to have little or no network packet retries, timeouts, and/or loss of bandwidth. We have confirmed with network team that the network switch is not really busy but still its causing loss of bandwidth and timeouts.
Environment
- Red Hat Enterprise Linux 7.3 -
kernel-3.10.0-514.el7
series - Red Hat Enterprise Linux 7.2 -
kernel-3.10.0-327.el7
series - TCP
- Most commonly seen with 10Gbps network interfaces (eg:
ixgbe
,be2net
, etc)
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