Re: [vmxnet3 PATCH] doc: describe kernel dependency and --vmware-tsc-map

[Damien Millescamps <damien.millescamps-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>]

On 07/25/2013 10:38 PM, Thomas Monjalon wrote:
> Be more verbose on kernel dependency about version and parameters.
> And add description of DPDK parameter for VMware.
>
> Signed-off-by: Thomas Monjalon <thomas.monjalon-pdR9zngts4EAvxtiuMwx3w@public.gmane.org>
> ---
>  README.rst |   17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/README.rst b/README.rst
> index 55436a4..c718ec7 100644
> --- a/README.rst
> +++ b/README.rst
> @@ -49,6 +49,9 @@ HOW TO BUILD
>  
>  There are two build dependencies: Linux kernel headers and DPDK >= 1.2.3r3.
>  
> +The kernel driver is based on vmxnet3-8.6.10 from VMware ESXi-5.0.0u2.
> +So the latest supported Linux version is 3.2.
> +
>  DPDK must be built first in order to have all its header files in the same
>  directory, that RTE_INCLUDE must point to.
>  
> @@ -93,15 +96,19 @@ Other parameters have a global effect:
>  - ``num_rxds=int``: number of RX descriptors per queue
>  - ``num_txds=int``: number of TX descriptors per queue
>  
> +Because the kernel module initializes interfaces, **it's very important that
> +DPDK parameters match kernel ones**. It won't work otherwise.
> +
>  For more information, use ``modinfo vmxnet3-usermap.ko``.
>  
> -The values of the kernel module parameters must match the DPDK ones.
> +In userland, librte_pmd_vmxnet3.so must be loaded by the DPDK using the ``-d``
> +option.
>  
> -Because the kernel module initializes interfaces, it's very important that
> -DPDK parameters match kernel ones. It won't work otherwise.
> +Another interesting option is ``--vmware-tsc-map``.
> +It allows VMware TSC mapping which provides an access to physical TSC.
> +When this option is used, take care of setting this ESXi parameter::
>  
> -In userland, librte_pmd_vmxnet3.so must be loaded by the DPDK using the "-d"
> -option.
> +  monitor_control.pseudo_perfctr = TRUE
>  
>  ``testpmd`` example for two ports, matching the ``insmod`` command above::
>  
ack