Poor Network Performance - Brocade Communications Systems CNA 1010 Troubleshooting Manual

Poor network performance

Poor network performance apparent for Windows and Linux systems.
1. Symptom: Checksum offloads are disabled.
2. Symptom: Dynamic interrupt moderation is disabled.
3. Symptom: Not all eight lanes of PCIe bus are functioning.
Brocade Adapters Troubleshooting Guide
53-1001582-01
SYSTEM\Current\ControlSet\Control\Windows
Action: For Windows, verify if checksum offload parameters are enabled using the Advanced
tab on the Network Adapters > Properties dialog box in Device Manager.
Action: For Linux, run the ethtool -k <interface ID> command. If offload parameters are on,
information similar to the following displays in the output.
rx-checksumming: on
tx-checksumming: on
tcp segmentation offload: on
Action: Checksum offloads should be enabled by default. If not, refer to the "Adapter
Configuration" appendix in the Brocade Adapters Installation and Reference Manual.
Action: For Windows, verify if interrupt moderation is enabled using the Advanced tab on the
Network Adapters > Properties dialog box in Device Manager.
Action: For Linux, run the ethtool -c <interface ID> command. If interrupt moderation is
enabled, information similar to the following displays in the output.
Coalesce parameters for eth2:
Adaptive RX: on TX: off
Action: Interrupt moderation should be enabled by default. If not, refer to the "Adapter
Configuration" appendix in the Brocade Adapters Installation and Reference Manual.
Action: For Linux, run the following command:
lspci –vv –d 1657:0014
If eight lanes are detected, information similar to the following should appear in the command
output:
Link: Supported Speed unknown, Width x8, ASPM L0s L1, Port 0
Link: Speed 2.5Gb/s, Width x8
Action: If eight lanes are not detected, try rebooting the system. If this does not fix the problem,
contact customer support for your adapter.
Ethernet network interface problems (CNAs only)
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