On Sat, Aug 17, 2024 at 01:36:59PM -0700, Jakub Kicinski wrote: > Looking at timestamped output of netdev CI reveals that > most of the time in forwarding tests for custom route > hashing is spent on a single case, namely the test which > uses ping (mausezahn does not support flow labels). > > On a non-debug kernel we spend 714 of 730 total test > runtime (97%) on this test case. While having flow label > support in a traffic gen tool / mausezahn would be best, > we can significantly speed up the loop by putting ip vrf exec > outside of the iteration. > > In a test of 1000 pings using a normal loop takes 50 seconds > to finish. While using: > > ip vrf exec $vrf sh -c "$loop-body" > > takes 12 seconds (1/4 of the time). > > Some of the slowness is likely due to our inefficient virtualization > setup, but even on my laptop running "ip link help" 16k times takes > 25-30 seconds, so I think it's worth optimizing even for fastest > setups. > > Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Reviewed-by: Ido Schimmel <idosch@xxxxxxxxxx> Tested-by: Ido Schimmel <idosch@xxxxxxxxxx> Thanks!
