On Tue, May 25, 2021 at 11:58:18AM +0500, Muhammad Ahmad wrote: > > The selection between scalar mode and vector mode was removed for > ixgbe driver in DPDK 20.02. The code base still has code > for scalar mode but it cannot be selected at compile time. The > vector mode is adequate for applications which require high > throughput which is the case most of the time, but scalar mode has > a use case in ultra-low-latency fintech applications for algorithmic > trading. This use case was also presented at the DPDK userspace > summit in September 2020. > This patch enables the ability to select between scalar and vector > modes for ixgbe drivers in the config. > In the future we can introduce API in ehtdev, which allow user to > select between latency and throughput mode. > > Signed-off-by: Muhammad Ahmad <muhammad.ah...@emumba.com> > --- Rather than having compile-time selection, this should be supported via runtime selection, using the force-max-simd-bitwidth flag. Setting the flag to 64 should force scalar paths.
Regards, /Bruce
