> --- a/doc/guides/linux_gsg/enable_func.rst
> +++ b/doc/guides/linux_gsg/enable_func.rst
> @@ -171,6 +171,10 @@ Please note that while using iommu=pt is compulsory for
> igb_uio driver, the vfio
> High Performance of Small Packets on 40G NIC
> --------------------------------------------
>
> +As there might be firmware fixes for performance enhancement in latest
> version
> +of firmware image, the firmware update might be needed for getting high
> performance.
> +Check with the local Intel's Network Division application engineers for
> firmware updates.
> +
> Enabling Extended Tag and Setting Max Read Request Size
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> @@ -198,3 +202,13 @@ Use 16 Bytes RX Descriptor Size
>
> As i40e PMD supports both 16 and 32 bytes RX descriptor sizes, and 16 bytes
> size can provide helps to high performance of small packets.
> Configuration of CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC in config files can
> be changed to use 16 bytes size RX descriptors.
> +
> +High Performance and per Packet Latency Tradeoff
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +Due to the hardware design, the interrupt signal inside NIC is needed for per
> +packet descriptor write-back. The minimum interval of interrupts could be set
> +at compile time by CONFIG_RTE_LIBRTE_I40E_ITR_INTERVAL in configuration
> files.
> +Though there is a default configuration, the interval could be tuned by the
> +users with that configuration item depends on what the user cares about more,
> +performance or per packet latency.
This kind of hardware information is not specific to Linux.
I think we should open some guides dedicated to drivers design.
Examples:
- doc/guides/drivers/i40e/
- doc/guides/drivers/enic/
- etc
Any volunteer to start this new doc directory?
--
Thomas
