Hi, Tested on ARM BF3: command: . /dpdk-testpmd -n 4 -a 0000:03:00.0,dv_flow_en=2 -a 0000:03:00.1,dv_flow_en=2 -a auxiliary: -a 00:00.0 -c 0x30 -- --mbcache=512 -i --nb-cores=1 --burst=64 --txd=256 --rxd=256 --record-burst-stats --record-core-cycles --auto-start
No offloads, plain testpmd with auto-start. On the other end I have ixia generating the ipv4_udp traffic, with dest udp range from 65024 to 65280 "To send different packets with msg size 64Bytes. We send 100% on TX side, and we read what we reactive back on RX side in ixia "using two ports agg." The results that we start to see after this commit is a degradation of 1.8% - 2% BRs, Wisam Jaddo > -----Original Message----- > From: Morten Brørup <[email protected]> > Sent: Wednesday, July 8, 2026 5:09 PM > To: Wisam Jaddo <[email protected]>; NBU-Contact-Thomas Monjalon > (EXTERNAL) <[email protected]> > Cc: [email protected]; Andrew Rybchenko <[email protected]>; > Raslan Darawsheh <[email protected]>; Maayan Kashani > <[email protected]> > Subject: RE: [PATCH v8] mempool: improve cache behaviour and performance > > > From: Wisam Jaddo [mailto:[email protected]] > > Sent: Wednesday, 8 July 2026 14.28 > > > > Hi, > > > > Our internal performance testing are showing degradation starting from > > this commit. > > The degradation is about 1.8% - 2% on small msg szies. > > What do you mean "small message sizes"? > > Also, please share more details about the test case: > Access pattern, e.g. pipelined across multiple threads or run-to-completion? > If > possible, link to test case source code? > Get and put burst sizes? > Mempool cache size? > Mempool driver? > > PS: I assume it is about mbuf mempool. Or is it some other object type in the > mempool? > > > > > BRs, > > Wisam Jaddo > > > > > -----Original Message----- > > > From: Thomas Monjalon <[email protected]> > > > Sent: Wednesday, June 10, 2026 2:07 PM > > > To: Morten Brørup <[email protected]> > > > Cc: [email protected]; Andrew Rybchenko <[email protected]> > > > Subject: Re: [PATCH v8] mempool: improve cache behaviour and > > performance > > > > > > 04/06/2026 13:48, Morten Brørup: > > > > This patch refactors the mempool cache to eliminate some > > > > unexpected behaviour and reduce the mempool cache miss rate. > > > > > > Applied, thanks. > > > > > >
