<snip> > > > > > Subject: RE: [dpdk-dev] [PATCH v3] net/mlx5: relaxed ordering for > > > > multi- packet RQ buffer refcnt > > > > > > > > Hi Phil Yang, we noticed that this patch gives us 10% of > > > > performance degradation on ARM. > > > > x86 seems to be unaffected though. Do you know what may be the > > > > reason of this behavior? > > > > > > Hi Alexander, > > > > > > Thanks for your feedback. > > > This patch removed some expensive memory barriers on aarch64, it > > > should get better performance. > > > I am not sure the root cause of this degradation now, I will start > > > the investigation. We can profiling this issue together. > > > Could you share your test case(including your testbed configuration) > > > with > > us? > > > > > > Thanks, > > > Phil > > > > I'm surprised too, Phil, but looks like it is actually making things > > worse. I used Connect-X 6DX on aarch64: > > Linux dragon71-bf 5.4.31-mlnx.15.ge938819 #1 SMP PREEMPT Thu Jul 2 > > 17:01:15 IDT 2020 aarch64 aarch64 aarch64 GNU/Linux Traffic generator > > sends 60 bytes packets and DUT executes the following command: > > arm64-bluefield-linuxapp-gcc/build/app/test-pmd/testpmd -n 4 -w > > 0000:03:00.1,mprq_en=1,rxqs_min_mprq=1 -w > > 0000:03:00.0,mprq_en=1,rxqs_min_mprq=1 -c 0xe -- --burst=64 -- > > mbcache=512 -i --nb-cores=1 --rxq=1 --txq=1 --txd=256 --rxd=256 > > --auto- start --rss-udp Without a patch I'm getting 3.2mpps, and only > > 2.9mpps when the patch is applied. > You are running on A72 cores, is that correct?
Correct, cat /proc/cpuinfo processor : 0 BogoMIPS : 312.50 Features : fp asimd evtstrm crc32 cpuid CPU implementer : 0x41 CPU architecture: 8 CPU variant : 0x0 CPU part : 0xd08 CPU revision : 3
