User Manual

TroubleshootingRev 2.3-1.0.1
Mellanox Technologies
206
5.6 Performance Related Issues
Table 14 - Performance Related Issues
Issue Cause Solution
The driver works but the
transmit and/or receive
data rates are not opti-
mal.
These recommendations may assist with
gaining immediate improvement:
1. Confirm PCI link negotiated uses its
maximum capability
2. Stop the IRQ Balancer service.
/etc/init.d/irq_balancer stop
3. Start mlnx_affinity service.
mlnx_affinity start
For best performance practices, please
refer to the "Performance Tuning Guide
for Mellanox Network Adapters"
(www.mellanox.com > Products >
InfiniBand/VPI Drivers > Linux SW/
Drivers).
5.7 SR-IOV Related Issues
Table 15 - SR-IOV Related Issues
Issue Cause Solution
Failed to enable
SR-IOV.
The following message
is reported in dmesg:
mlx4_core
0000:xx:xx.0: Failed
to enable SR-IOV,
continuing without
SR-IOV (err = -22)
The number of VFs config-
ured in the driver is higher
than configured in the firm-
ware.
1. Check the firmware SR-IOV configura-
tion, run the mlxconfig tool.
2. Set the same number of VFs for the
driver.
Failed to enable
SR-IOV.
The following message
is reported in dmesg:
mlx4_core
0000:xx:xx.0: Failed
to enable SR-IOV,
continuing without
SR-IOV (err = -12)
SR-IOV is disabled in the
BIOS.
Check that the SR-IOV is enabled in the
BIOS (see Section 3.4.1.2, “Setting Up
SR-IOV”, on page 171).