Re: [PATCH v3 1/2] net/ixgbe: increase the maximum of RX/TX descriptors

[Bruce Richardson <bruce.richardson@intel.com>]

On Wed, Oct 30, 2024 at 05:26:12PM +0100, Morten Brørup wrote:
> > From: Lukas Sismis [mailto:sismis@cesnet.cz]
> > Sent: Wednesday, 30 October 2024 16.43
> > 
> > Intel PMDs are capped by default to only 4096 RX/TX descriptors.
> > This can be limiting for applications requiring a bigger buffer
> > capabilities. By bufferring more packets with RX/TX
> > descriptors, the applications can better handle the processing
> > peaks.
> > 
> > Setting ixgbe max descriptors to 8192 as per datasheet:
> > Register name: RDLEN
> > Description: Descriptor Ring Length.
> > This register sets the number of bytes
> > allocated for descriptors in the circular descriptor buffer.
> > It must be 128B aligned (7 LS bit must be set to zero).
> > ** Note: validated Lengths up to 128K (8K descriptors). **

FYI: Don't think we need the full quote from the datasheet, reducing this to
a one-line summary on apply.

> > 
> > Signed-off-by: Lukas Sismis <sismis@cesnet.cz>
> > ---
> 
> Drivers should reflect hardware capabilities; it's not up to the driver to impose artificial limits on applications. Thank you for fixing this, Lukas.
> 
> Acked-by: Morten Brørup <mb@smartsharesystems.com>
> 
Series-acked-by: Bruce Richardson <bruce.richardson@intel.com>

Both patches applied to dpdk-next-net-intel tree.

Thanks,
/Bruce