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Skylake
~~~~~~~
Following sections include sample calibration data measured on
s11-t31-sut1 server running in one of the Intel Xeon Skylake testbeds as
specified in `FD.io CSIT testbeds - Xeon Skylake, Arm, Atom`_.
Calibration data obtained from all other servers in Skylake testbeds
shows the same or similar values.
Linux cmdline
^^^^^^^^^^^^^
::
$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-5.4.0-65-generic root=UUID=55d44abd-94d6-4b26-9d93-5877a8658016 ro audit=0 hpet=disable intel_idle.max_cstate=1 intel_iommu=on intel_pstate=disable iommu=pt isolcpus=1-27,29-55,57-83,85-111 mce=off nmi_watchdog=0 nohz_full=1-27,29-55,57-83,85-111 nosoftlockup numa_balancing=disable processor.max_cstate=1 rcu_nocbs=1-27,29-55,57-83,85-111 tsc=reliable console=ttyS0,115200n8 quiet
Linux uname
^^^^^^^^^^^
::
$ uname -a
Linux 5.4.0-65-generic #73-Ubuntu SMP Mon Jan 18 17:25:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
System-level Core Jitter
^^^^^^^^^^^^^^^^^^^^^^^^
::
$ sudo taskset -c 3 /home/testuser/pma_tools/jitter/jitter -i 20
Linux Jitter testing program version 1.8
Iterations=20
The pragram will execute a dummy function 80000 times
Display is updated every 20000 displayUpdate intervals
Timings are in CPU Core cycles
Inst_Min: Minimum Excution time during the display update interval(default is ~1 second)
Inst_Max: Maximum Excution time during the display update interval(default is ~1 second)
Inst_jitter: Jitter in the Excution time during rhe display update interval. This is the value of interest
last_Exec: The Excution time of last iteration just before the display update
Abs_Min: Absolute Minimum Excution time since the program started or statistics were reset
Abs_Max: Absolute Maximum Excution time since the program started or statistics were reset
tmp: Cumulative value calcualted by the dummy function
Interval: Time interval between the display updates in Core Cycles
Sample No: Sample number
Inst_Min Inst_Max Inst_jitter last_Exec Abs_min Abs_max tmp Interval Sample No
160022 171330 11308 160022 160022 171330 2538733568 3204142750 1
160022 167294 7272 160026 160022 171330 328335360 3203873548 2
160022 167560 7538 160026 160022 171330 2412904448 3203878736 3
160022 169000 8978 160024 160022 171330 202506240 3203864588 4
160022 166572 6550 160026 160022 171330 2287075328 3203866224 5
160022 167460 7438 160026 160022 171330 76677120 3203854632 6
160022 168134 8112 160024 160022 171330 2161246208 3203874674 7
160022 169094 9072 160022 160022 171330 4245815296 3203878798 8
160022 172460 12438 160024 160022 172460 2035417088 3204112010 9
160022 167862 7840 160030 160022 172460 4119986176 3203856800 10
160022 168398 8376 160024 160022 172460 1909587968 3203854192 11
160022 167548 7526 160024 160022 172460 3994157056 3203847442 12
160022 167562 7540 160026 160022 172460 1783758848 3203862936 13
160022 167604 7582 160024 160022 172460 3868327936 3203859346 14
160022 168262 8240 160024 160022 172460 1657929728 3203851120 15
160022 169700 9678 160024 160022 172460 3742498816 3203877690 16
160022 170476 10454 160026 160022 172460 1532100608 3204088480 17
160022 167798 7776 160024 160022 172460 3616669696 3203862072 18
160022 166540 6518 160024 160022 172460 1406271488 3203836904 19
160022 167516 7494 160024 160022 172460 3490840576 3203848120 20
Memory Bandwidth
^^^^^^^^^^^^^^^^
::
$ sudo /home/testuser/mlc --bandwidth_matrix
Intel(R) Memory Latency Checker - v3.5
Command line parameters: --bandwidth_matrix
Using buffer size of 100.000MB/thread for reads and an additional 100.000MB/thread for writes
Measuring Memory Bandwidths between nodes within system
Bandwidths are in MB/sec (1 MB/sec = 1,000,000 Bytes/sec)
Using all the threads from each core if Hyper-threading is enabled
Using Read-only traffic type
Numa node
Numa node 0 1
0 107947.7 50951.5
1 50834.6 108183.4
::
$ sudo /home/testuser/mlc --peak_injection_bandwidth
Intel(R) Memory Latency Checker - v3.5
Command line parameters: --peak_injection_bandwidth
Using buffer size of 100.000MB/thread for reads and an additional 100.000MB/thread for writes
Measuring Peak Injection Memory Bandwidths for the system
Bandwidths are in MB/sec (1 MB/sec = 1,000,000 Bytes/sec)
Using all the threads from each core if Hyper-threading is enabled
Using traffic with the following read-write ratios
ALL Reads : 215733.9
3:1 Reads-Writes : 182141.9
2:1 Reads-Writes : 178615.7
1:1 Reads-Writes : 149911.3
Stream-triad like: 159533.6
::
$ sudo /home/testuser/mlc --max_bandwidth
Intel(R) Memory Latency Checker - v3.5
Command line parameters: --max_bandwidth
Using buffer size of 100.000MB/thread for reads and an additional 100.000MB/thread for writes
Measuring Maximum Memory Bandwidths for the system
Will take several minutes to complete as multiple injection rates will be tried to get the best bandwidth
Bandwidths are in MB/sec (1 MB/sec = 1,000,000 Bytes/sec)
Using all the threads from each core if Hyper-threading is enabled
Using traffic with the following read-write ratios
ALL Reads : 216875.73
3:1 Reads-Writes : 182615.14
2:1 Reads-Writes : 178745.67
1:1 Reads-Writes : 149485.27
Stream-triad like: 180057.87
Memory Latency
^^^^^^^^^^^^^^
::
$ sudo /home/testuser/mlc --latency_matrix
Intel(R) Memory Latency Checker - v3.5
Command line parameters: --latency_matrix
Using buffer size of 2000.000MB
Measuring idle latencies (in ns)...
Numa node
Numa node 0 1
0 81.4 131.1
1 131.1 81.3
::
$ sudo /home/testuser/mlc --idle_latency
Intel(R) Memory Latency Checker - v3.5
Command line parameters: --idle_latency
Using buffer size of 2000.000MB
Each iteration took 202.0 core clocks ( 80.8 ns)
::
$ sudo /home/testuser/mlc --loaded_latency
Intel(R) Memory Latency Checker - v3.5
Command line parameters: --loaded_latency
Using buffer size of 100.000MB/thread for reads and an additional 100.000MB/thread for writes
Measuring Loaded Latencies for the system
Using all the threads from each core if Hyper-threading is enabled
Using Read-only traffic type
Inject Latency Bandwidth
Delay (ns) MB/sec
==========================
00000 282.66 215712.8
00002 282.14 215757.4
00008 280.21 215868.1
00015 279.20 216313.2
00050 275.25 216643.0
00100 227.05 215075.0
00200 121.92 160242.9
00300 101.21 111587.4
00400 95.48 85019.7
00500 94.46 68717.3
00700 92.27 49742.2
01000 91.03 35264.8
01300 90.11 27396.3
01700 89.34 21178.7
02500 90.15 14672.8
03500 89.00 10715.7
05000 82.00 7788.2
09000 81.46 4684.0
20000 81.40 2541.9
L1/L2/LLC Latency
^^^^^^^^^^^^^^^^^
::
$ sudo /home/testuser/mlc --c2c_latency
Intel(R) Memory Latency Checker - v3.5
Command line parameters: --c2c_latency
Measuring cache-to-cache transfer latency (in ns)...
Local Socket L2->L2 HIT latency 53.7
Local Socket L2->L2 HITM latency 53.7
Remote Socket L2->L2 HITM latency (data address homed in writer socket)
Reader Numa Node
Writer Numa Node 0 1
0 - 113.9
1 113.9 -
Remote Socket L2->L2 HITM latency (data address homed in reader socket)
Reader Numa Node
Writer Numa Node 0 1
0 - 177.9
1 177.6 -
.. include:: ../introduction/test_environment_sut_meltspec_skx.rst
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