Hello,
kernel test robot noticed a -21.8% regression of lmbench3.TCP.socket.bandwidth.10MB.MB/sec on:
commit: 8ee602c635206ed012f979370094015857c02359 ("tcp: try to send bigger TSO packets")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
[still regression on linux-next/master bb7a2467e6beef44a80a17d45ebf2931e7631083]
testcase: lmbench3
test machine: 48 threads 2 sockets Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz (Ivy Bridge-EP) with 64G memory
parameters:
test_memory_size: 50%
nr_threads: 100%
mode: development
test: TCP
cpufreq_governor: performance
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202404302139.175c602f-oliver.sang@xxxxxxxxx
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240430/202404302139.175c602f-oliver.sang@xxxxxxxxx
=========================================================================================
compiler/cpufreq_governor/kconfig/mode/nr_threads/rootfs/tbox_group/test/test_memory_size/testcase:
gcc-13/performance/x86_64-rhel-8.3/development/100%/debian-12-x86_64-20240206.cgz/lkp-ivb-2ep2/TCP/50%/lmbench3
commit:
d5b38a71d3 ("tcp: call tcp_set_skb_tso_segs() from tcp_write_xmit()")
8ee602c635 ("tcp: try to send bigger TSO packets")
d5b38a71d3334bc8 8ee602c635206ed012f97937009
---------------- ---------------------------
%stddev %change %stddev
\ | \
50684 -21.8% 39620 lmbench3.TCP.socket.bandwidth.10MB.MB/sec
10.17 ± 41% +83.6% 18.67 ± 15% perf-c2c.HIT.remote
0.10 ± 71% +0.1 0.22 ± 16% perf-profile.self.cycles-pp.__tcp_push_pending_frames
0.66 ± 72% +0.6 1.24 ± 14% perf-profile.self.cycles-pp.tcp_write_xmit
965580 ± 83% +150.9% 2422689 ± 51% numa-meminfo.node1.FilePages
1617434 ± 52% +91.0% 3089919 ± 40% numa-meminfo.node1.MemUsed
3863 ± 14% +24.5% 4810 ± 11% numa-meminfo.node1.PageTables
612236 ±149% +218.4% 1949210 ± 61% numa-meminfo.node1.Unevictable
241348 ± 83% +150.9% 605612 ± 51% numa-vmstat.node1.nr_file_pages
964.36 ± 14% +24.7% 1202 ± 10% numa-vmstat.node1.nr_page_table_pages
153059 ±149% +218.4% 487302 ± 61% numa-vmstat.node1.nr_unevictable
153059 ±149% +218.4% 487302 ± 61% numa-vmstat.node1.nr_zone_unevictable
51738871 ± 15% +27.3% 65841641 perf-stat.i.cache-misses
0.45 ± 7% -7.5% 0.41 perf-stat.i.ipc
1.29 ± 2% +17.0% 1.51 perf-stat.overall.MPKI
9.45 +1.9 11.39 perf-stat.overall.cache-miss-rate%
2.67 +3.2% 2.75 perf-stat.overall.cpi
2064 ± 2% -11.8% 1820 perf-stat.overall.cycles-between-cache-misses
0.37 -3.1% 0.36 perf-stat.overall.ipc
51471548 ± 15% +27.5% 65638078 perf-stat.ps.cache-misses
Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
