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----
-lastproofread: '2026-02-27'
----
-
-(vpp_config_dataplane_memory)=
-
-```{include} /_include/need_improvement.txt
-```
-
-# VPP Memory Configuration
-
-VPP heavily relies on hugepages for its memory management. Hugepages
-are larger memory pages that reduce the overhead of page management and
-improve performance for applications that require large amounts of
-memory, such as VPP.
-
-VPP supports both 2MB and 1GB hugepages, but the default and most
-commonly used size is 2MB. The choice of hugepage size can impact
-performance, with larger pages generally providing better performance
-for memory-intensive applications.
-
-Before configuring memory in VPP dataplane settings, you need to
-ensure that hugepages are enabled and properly configured on your
-system.
-
-:::{seealso}
-{ref}`Hugepages in VyOS Configuration for VPP <vpp-config-hugepages>`
-:::
-
-To configure memory settings for VPP, you can use the following
-commands in the VPP CLI:
-
-VPP uses a main heap as a central memory pool for FIB data structures
-entry allocations.
-
-Efficient memory management is crucial for VPP's performance, and the
-main heap plays a significant role in this.
-
-It can be configured using the following command:
-
-```{cfgcmd} set vpp settings resource-allocation memory main-heap-page-size \<size\>
-```
-
-Sets the main heap page size for VPP.
-
-```{cfgcmd} set vpp settings resource-allocation memory main-heap-size \<size\>
-```
-
-Sets the main heap size for VPP.
-(vpp-config-dataplane-physmem)=
-
-## Physical Memory Configuration
-
-VPP uses physical memory for packet buffers and interface operations.
-The `physmem` setting controls how much memory VPP can allocate for
-these operations.
-
-```{cfgcmd} set vpp settings resource-allocation memory physmem-max-size \<size\>
-```
-
-Sets the maximum amount of physical memory VPP can use for packet
-processing and interface buffers.
-
-**Default**: 16GB (usually sufficient for most deployments)
-
-You may need to modify the value for high-throughput environments with
-many interfaces, large packet buffers, very high packet rates, or
-memory-constrained systems where you need to limit VPP's memory usage.
-
-**Physmem independent of main heap size** — physmem is for packet
-buffers, main heap is for routing tables.
-
-:::{seealso}
-- {ref}`Hugepages in VyOS Configuration for VPP <vpp-config-hugepages>`
-- {ref}`VPP Buffer Configuration <vpp-config-dataplane-buffers>` - for
-  controlling buffer allocation within physmem
-:::
-
-### Common configurations
-
-```none
-# Reduce for memory-constrained systems
-set vpp settings physmem max-size 4G
-
-# Increase for high-throughput environments
-set vpp settings physmem max-size 32G
-```
-
-## Stats Memory Configuration
-
-VPP uses a dedicated statistics memory segment to store runtime
-counters and telemetry data. This segment is used by the VPP CLI and
-monitoring tools to access performance and status information.
-
-The statistics segment is allocated from hugepage memory and can be
-configured independently from the main heap and physmem settings.
-
-You can configure statistics memory using the following commands:
-
-```{cfgcmd} set vpp settings resource-allocation memory stats page-size \<size\>
-```
-
-Sets the hugepage page size used for the statistics memory segment.
-
-```{cfgcmd} set vpp settings resource-allocation memory stats size \<size\>
-```
-
-Sets the total size of the statistics memory segment.
-
-Increasing this value may be required in large deployments with many
-interfaces or enabled features that generate a high number of counters.
-
-Statistics memory is used only for telemetry and monitoring. It does
-not affect packet buffer allocation or routing table memory.
-
-## Troubleshooting
-
-Improper configuration of main heap size can lead to performance
-degradation or even system instability. If VPP runs out of memory in the
-main heap, it may crash or exhibit erratic behavior. Symptoms you may
-observe include:
-
-- Increased latency or packet loss
-- Crashes or restarts of VPP processes, especially during routing table
-  population (for example, BGP session establishment)
-- Error messages related to memory allocation failures
-
-You need to tune the main heap size based on expected FIB entries. Pay
-attention: the same amount of routes with a single next-hop and with
-multiple next-hops will consume different amounts of memory.
-
-For physmem, insufficient allocation can lead to packet drops, interface
-initialization failures, and overall degraded performance. Symptoms
-include:
-
-- Packet drops or failures to allocate buffers
-- Increased latency or jitter in packet processing
-- Crashes or restarts of VPP processes under heavy load
-
-You need to tune the physmem settings based on expected traffic patterns
-and interface usage. Monitor memory usage closely and adjust the
-configuration as needed to ensure optimal performance.