On Fri, 27 Feb 2026 14:43:19 -0800 Stephen Hemminger <[email protected]> wrote:
> The txonly multi-flow mode generates 64 unique UDP source ports per > lcore by cycling the high byte from 0xC0 to 0xFF. On SmartNICs with > limited hardware flow table caching, this fixed count can exhaust the > flow cache and degrade receive-side performance. > > Add --txonly-flows=N command line parameter and 'set txonly-flows' > runtime command to limit the number of unique source ports per lcore > to between 1 and 64. The default remains 64 to preserve existing > behavior. > > The source port encoding is unchanged: the low byte carries the lcore > ID (avoiding atomics) and the high byte cycles through N values > starting at 0xC0. Total unique flows = txonly_nb_flows * active_lcores. > > Reported-by: Long Li <[email protected]> > Signed-off-by: Stephen Hemminger <[email protected]> > Tested-by: Long Li <[email protected]> Applied to next-net (after fixing spelling errors).
