Re: [Linuxarm] [PATCH net] net: sched: fix packet stuck problem for lockless qdisc

On Fri, Mar 19, 2021 at 2:25 AM Yunsheng Lin [off-list ref] wrote:

I had done some performance test to see if there is value to
fix the packet stuck problem and support lockless qdisc bypass,
here is some result using pktgen in 'queue_xmit' mode on a dummy
device as Paolo Abeni had done in [1], and using pfifo_fast qdisc:

threads  vanilla    locked-qdisc    vanilla+this_patch
   1     2.6Mpps      2.9Mpps            2.5Mpps
   2     3.9Mpps      4.8Mpps            3.6Mpps
   4     5.6Mpps      3.0Mpps            4.7Mpps
   8     2.7Mpps      1.6Mpps            2.8Mpps
   16    2.2Mpps      1.3Mpps            2.3Mpps

locked-qdisc: test by removing the "TCQ_F_NOLOCK | TCQ_F_CPUSTATS".

I read this as this patch introduces somehow a performance
regression for -net, as the lockless bypass patch you submitted is
for -net-next.

Thanks.