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----
-lastproofread: '2026-02-23'
----
-
-(vpp-config-dataplane-buffers)=
-
-```{include} /_include/need_improvement.txt
-```
-
-# VPP Dataplane Buffers Configuration
-
-Buffers are essential for handling network packets efficiently. Proper
-configuration enhances performance and reliability, and is mandatory for
-VPP to work. Buffers temporarily store packets during processing. Therefore,
-their configuration must be in sync with NIC configuration, CPU threads, and
-overall system resources.
-
-:::{important}
-VPP buffers are allocated from the physical memory pool (`physmem`). The
-total amount of memory available for buffer allocation is controlled by the
-`physmem-max-size` setting, while the buffer configuration parameters
-below control how that memory is used for buffer allocation.
-
-See {ref}`VPP Physical Memory Configuration <vpp_config_dataplane_physmem>`
-for details on configuring `physmem`.
-:::
-
-## Buffer Configuration Parameters
-
-The following parameters can be configured for VPP buffers:
-
-### buffers-per-numa
-Number of buffers allocated per NUMA node. This setting optimizes
-memory access patterns for multi-CPU systems.
-
-Typically, you need to tune this value if:
-- The system has many interfaces
-- NICs have many queues
-- NICs have large descriptor sizes
-
-Set this value carefully to balance memory usage and performance.
-```{cfgcmd} set vpp settings resource-allocation buffers buffers-per-numa \<value\>
-```
-The common approach for the calculation is to use the formula:
-```none
-buffers-per-numa = (num-rx-queues * num-rx-desc) + (num-tx-queues * num-tx-desc)
-```
-Calculate this formula for each NIC and sum the results. Multiply the
-total by 2.5 to get the minimum recommended value for
-`buffers-per-numa`.
-
-Avoid setting this value too low to prevent packet drops.
-
-### data-size
-This value sets how much payload data can be stored in a single buffer
-allocated by VPP. Larger values reduce buffer chains for large packets,
-while smaller values conserve memory for environments handling mostly
-small packets.
-```{cfgcmd} set vpp settings resource-allocation buffers data-size \<value\>
-```
-Optimal size depends on the typical packet size in your network. If
-unsure, use the largest MTU in your network plus overhead (for example,
-128 bytes).
-
-### page-size
-A memory pages type used for buffer allocation. Common values are 4K, 2M, or 1G.
-
-Use page sizes configured in your system settings.
-```{cfgcmd} set vpp settings resource-allocation buffers page-size \<value\>
-```
-
-## Potential Issues and Troubleshooting
-
-Improper buffer configuration can lead to issues such as:
-
-- Increased latency and packet loss
-- Inefficient CPU utilization
-- Interface initialization failures
-
-Indicators of such issues are:
-
-- Errors during interfaces initialization in VPP logs
-- Packet drops observed in VPP statistics
-
-To troubleshoot buffer-related issues, consider the following steps:
-
-- Review VPP logs for errors related to buffer allocation. Look for
-  error `-5` messages.
-- Tune available buffers by adjusting the `buffers-per-numa` and
-  `data-size` parameters.