Solarflare
Server
Adapter
User
Guide
Solarflare
Adapters
on
Linux
Issue
20
©
Solarflare
Communications
2017
128
port_rx_gtjumbo
Number
of
packets
received
with
a
length
is
greater
than
9000
bytes.
port_rx_bad_gtjumbo
Number
of
packets
received
with
a
length
greater
than
9000
bytes,
but
with
incorrect
CRC
value.
port_rx_overflow
Number
of
packets
dropped
by
receiver
because
of
FIFO
overrun.
port_rx_nodesc_drop_cnt
port_rx_nodesc_drops
Number
of
packets
dropped
by
the
network
adapter
because
of
a
lack
of
RX
descriptors
in
the
RX
queue.
Packets
can
be
dropped
by
the
NIC
when
there
are
insufficient
RX
descriptors
in
the
RX
queue
to
allocate
to
the
packet.
This
problem
occurs
if
the
receive
rate
is
very
high
and
the
network
adapter
receive
cycle
process
has
insufficient
time
between
processing
to
refill
the
queue
with
new
descriptors.
A
number
of
different
steps
can
be
tried
to
resolve
this
issue:
•
Disable
the
irqbalance
daemon
in
the
OS
•
Distribute
the
traffic
load
across
the
available
CPU/cores
by
setting
rss_cpus=cores.
Refer
to
Receive
Side
Scaling
section
•
Increase
receive
queue
size
using
ethtool.
port_rx_pm_trunc_bb_overflow
Overflow
of
the
packet
memory
burst
buffer
‐
should
not
occur.
port_rx_pm_discard_bb_overflow
Number
of
packets
discarded
due
to
packet
memory
buffer
overflow.
Table
28:
Ethtool
‐
S
output
Field
Description