CONFIG_DWMAC_NB_RX_DESCS¶
Number of entries in the receive descriptor ring
Type: int
Help¶
Received packets are spread across the required number of fragment
buffers. Each RX fragment has a size of CONFIG_NET_BUF_DATA_SIZE.
There is one descriptor entry per fragment.
A higher number allows for more packets to be received without
immediate intervention from the CPU but requires more transient
memory. A smaller number increases the risk of an overflow and
dropped packets.
Default¶
16
Kconfig definition¶
At drivers/ethernet/Kconfig.dwmac:55
Included via Kconfig:8 → Kconfig.zephyr:42 → drivers/Kconfig:20 → drivers/ethernet/Kconfig:53
Menu path: (Top) → Device Drivers → Ethernet Drivers → Synopsys DesignWare MAC driver
config DWMAC_NB_RX_DESCS
int "Number of entries in the receive descriptor ring"
range 4 128
default 16
depends on ETH_DWMAC && NET_L2_ETHERNET
help
Received packets are spread across the required number of fragment
buffers. Each RX fragment has a size of CONFIG_NET_BUF_DATA_SIZE.
There is one descriptor entry per fragment.
A higher number allows for more packets to be received without
immediate intervention from the CPU but requires more transient
memory. A smaller number increases the risk of an overflow and
dropped packets.
(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)