Buffer Tuning Commands - Dell Force10 C150 Configuration Manual

Buffer tuning commands

Task
Define a buffer profile for the FP queues.
Define a buffer profile for the CSF queues.
Change the dedicated buffers on a physical 1G
interface.
Change the maximum amount of dynamic buffers
an interface can request.
Change the number of packet-pointers per queue.
Apply the buffer profile to a line card.
Apply the buffer profile to a CSF to FP link.
FTOS Behavior: If you attempt to apply a buffer profile to a non-existent port-pipe, FTOS displays the
following message. However, the configuration still appears in the running-config.
%DIFFSERV-2-DSA_BUFF_CARVING_INVALID_PORT_SET: Invalid FP port-set 2 for linecard 2. Valid
range of port-set is <0-1>
Configuration changes take effect immediately and appear in the running configuration. Since under
normal conditions all ports do not require the maximum possible allocation, the configured dynamic
allocations can exceed the actual amount of available memory; this is called oversubscription. If you
choose to oversubscribe the dynamic allocation, a burst of traffic on one interface might prevent other
interfaces from receiving the configured dynamic allocation, which causes packet loss.
You cannot allocate more than the available memory for the dedicated buffers. If the system determines
that the sum of the configured dedicated buffers allocated to the queues is more than the total available
memory, the configuration is rejected, returning a syslog message similar to the following.
Table 62-2. Buffer Allocation Error
00:04:20: %S50N:0 %DIFFSERV-2-DSA_DEVICE_BUFFER_UNAVAILABLE: Unable to allocate dedicated buffers for
stack-unit 0, port pipe 0, egress port 25 due to unavailability of cells
FTOS Behavior: When you remove a buffer-profile using the command
CONFIGURATION mode, the buffer-profile name still appears in the output of
[detail | summary]
the profile name remains. Remove it from the
by entering no buffer [ fp-uplink | csf ] linecard port-set buffer-policy from CONFIGURATION mode
and
no buffer-policy
Display the allocations for any buffer profile using the show commands in
buffer profile using the command
shown in Figure
. After a line card reset, the buffer profile correctly returns to the default values, but
from INTERFACE mode.
show buffer-profile {summary | detail}
62-7.
Command
buffer-profile fp fsqueue
buffer-profile csf csqueue
buffer dedicated
buffer dynamic
buffer packet-pointers
buffer fp-uplink linecard
buffer csf linecard
show buffer-profile
Command Mode
CONFIGURATION
CONFIGURATION
BUFFER PROFILE
BUFFER PROFILE
BUFFER PROFILE
CONFIGURATION
CONFIGURATION
no buffer-profile [fp | csf
show buffer-profile
[ | ] command output
detail summary
Figure 62-8. Display the default
from EXEC Privilege mode, as
S-Series Debugging and Diagnostics | 1229
] from