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Internet Protocol Version 6 Support

Introduction:  

z/VM V4.4 provided Internet Protocol Version 6 (IPv6) support, in CP, for OSA-Express guest LANs operating in QDIO mode. (Note that this support does not apply to guest LANs operating in HIPER mode.) z/VM V5.1 enhances its IPv6 support, in TCP/IP, by allowing the stack to be configured for IPv6 networks connected through OSA-Express operating in QDIO mode. The stack can be configured to provide static routing of IPv6 packets and to send IPv6 router advertisements.

This section summarizes measurement results comparing IPv6 to IPv4 and comparing IPv4 to IPv4 over devices defined as IPv6 capable. Measurements were done using guest LAN and using OSA-Express Gigabit Ethernet cards. Additional IPv6 to IPv4 comparisons for the case of communication between Linux systems via z/VM Virtual Switch using the Layer2 transport mode are provided in Virtual Switch Layer 2 Support.

Methodology:   An internal version of the Application Workload Modeler (AWM) was used to drive request-response (RR), connect-request-response (CRR) and streaming (STR) workloads. The request-response workload consisted of the client sending 200 bytes to the server and the server responding with 1000 bytes. This interaction was repeated for 200 seconds. The connect-request-response workload had the client connecting, sending 64 bytes to the server, the server responding with 8K and the client then disconnecting. This same sequence was repeated for 200 seconds. The streaming workload consisted of the client sending 20 bytes to the server and the server responding with 20MB. This sequence was repeated for 400 seconds.

A complete set of runs, consisting of 3 trials for each case, for 1, 10, 20 and 50 client-server pairs, was done with the maximum transmission unit (MTU) set to 1492 and 8992.

The measurements were done on a 2064-109 with 3 dedicated processors in each LPAR used. Each LPAR had 1GB of central storage and 2GB expanded storage. CP monitor data was captured for one LPAR (client side) during the measurement and reduced using the Performance Toolkit (Perfkit).

Figure 1. Guest LAN Environment



Figure ip6fig1 not displayed.


Figure 2. OSA QDIO Environment



Figure ip6fig2 not displayed.


Figure 1 shows the measurement environment for guest LAN where the client communicates with its stack (tcpip1), the client stack sends the request over a guest LAN to the server stack (tcpip2), which then sends the request to the server. Figure 2 shows the measurement environment for OSA-Express where the client communicates with its stack (tcpip1), the client stack sends the request over the OSA-Express card to the server stack (tcpip2) in another LPAR, and the server stack then sends the request to the server.

Results:   The following tables compare the average of 3 trials for each measurement between IPv4 and IPv4 over IPv6 capable devices (noted as v5 in the tables), and between IPv4 and IPv6. The numbers shown are the percent increase (or decrease) relative to IPv4. A positive number for throughput (either MB/sec or trans/sec) is good and a negative number for CPU time is good. Our target was for IPv6 to be within 3% of the throughput and CPU time for IPv4. For guest LAN, this was true for all workloads. For the OSA Express GigaBit Ethernet card (noted as QDIO in the tables) this is not true for the STR and CRR workloads when the MTU size is 1492.

  • For streaming, throughput was 10% to 19% less for IPv4 over IPv6 capable devices and 12% to 25% less for IPv6. CPU time was 10% to 40% higher for IPv4 over IPv6 and 11% to 40% higher for IPv6.

  • For CRR, throughput for both IPv4 over IPv6 capable devices and for IPv6 met our target overall. However, CPU time was 3% to 5% higher for IPv4 over IPv6 capable and 12% to 13% higher for IPv6.
When the MTU size is 8992, the 3% target was met. Except for the 20-user case, RR met the target for both MTU sizes. More investigation is required to determine why targets were not met.

Table 1. Guest LAN QDIO - STR


Number of clients


1


10


20


50


MTU 1492
runid V4
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB



vg4sn01
77.13
24.85
13.34
11.51



vg4sn10
56.53
31.40
17.65
13.74



vg4sn20
47.73
37.46
21.52
15.94



vg4sn50
38.27
48.08
27.70
20.38


runid V5
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


vg5sn01
77.23
24.78
13.28
11.50


vg5sn10
57.97
31.14
17.48
13.66


vg5sn20
48.03
37.20
21.34
15.86


vg5sn50
37.97
48.31
27.68
20.63


runid V6
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


vg6sn01
75.10
24.48
12.98
11.49


vg6sn10
56.57
31.38
17.45
13.93


vg6sn20
47.77
37.56
21.35
16.20


vg6sn50
38.50
47.97
27.53
20.44


%diff V4 to V5














MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


0%
0%
0%
0%


3%
-1%
-1%
-1%


1%
-1%
-1%
0%


-1%
0%
0%
1%


%diff V4 to V6














MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


-3%
-2%
-3%
0%


0%
0%
-1%
1%


0%
0%
-1%
2%


1%
0%
-1%
0%


MTU 8992
runid V4
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB



vg4sj01
103.63
18.55
8.95
9.60



vg4sj10
112.70
22.94
11.26
11.68



vg4sj20
93.97
26.92
13.52
13.41



vg4sj50
74.80
32.01
16.12
15.88


runid V5
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


vg5sj01
103.93
19.35
9.38
9.97


vg5sj10
111.43
23.33
11.44
11.89


vg5sj20
93.63
27.11
13.61
13.50


vg5sj50
74.90
32.00
16.10
15.90


runid V6
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


vg6sj01
104.53
18.80
8.91
9.89


vg6sj10
114.83
22.52
10.82
11.70


vg6sj20
95.10
26.72
13.21
13.51


vg6sj50
75.50
31.83
15.89
15.93


% diff V4 to V5














MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


0%
2%
2%
2%


-1%
2%
2%
2%


0%
1%
1%
1%


0%
0%
0%
0%


% diff V4 to V6














MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


1%
1%
0%
3%


2%
-2%
-4%
0%


1%
-1%
-2%
1%


1%
-1%
-1%
0%

Note: 2064-109; z/VM 5.1.0; TCP/IP 510; V5 denotes IPv4 over IPv6 capable

Table 2. Guest LAN QDIO - CRR


Number of clients


1


10


20


50


MTU 1492
runid V4
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans



vg4cn01
163.06
6.29
5.11
1.17



vg4cn10
419.96
4.54
3.48
1.06



vg4cn20
475.30
4.11
3.09
1.02



vg4cn50
573.88
3.97
2.87
1.10


runid V5
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vg5cn01
164.23
6.25
5.08
1.17


vg5cn10
421.82
4.54
3.49
1.05


vg5cn20
475.38
4.10
3.09
1.02


vg5cn50
571.86
3.97
2.86
1.11


runid V6
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vg6cn01
208.06
4.91
3.74
1.17


vg6cn10
433.58
4.48
3.42
1.06


vg6cn20
485.52
4.08
3.05
1.02


vg6cn50
582.96
3.95
2.85
1.10


% diff V4 to V5














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


1%
-1%
-1%
0%


0%
0%
0%
0%


0%
0%
0%
0%


0%
0%
0%
1%


% diff V4 to V6














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


28%
-22%
-27%
0%


3%
-1%
-2%
1%


2%
-1%
-1%
1%


2%
-1%
-1%
0%


MTU 8992
runid V4
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans



vg4cj01
168.58
6.06
5.03
1.03



vg4cj10
439.28
4.71
3.80
0.91



vg4cj20
501.21
3.96
3.09
0.87



vg4cj50
570.08
3.84
2.88
0.96


runid V5
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vg5cj01
168.00
6.09
5.07
1.02


vg5cj10
442.18
4.72
3.80
0.91


vg5cj20
501.64
3.95
3.08
0.87


vg5cj50
574.22
3.83
2.86
0.97


runid V6
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vg6cj01
216.95
4.72
3.70
1.02


vg6cj10
479.68
4.01
3.10
0.91


vg6cj20
529.28
3.64
2.76
0.87


vg6cj50
615.28
3.45
2.50
0.95


% diff V4 to V5














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


0%
0%
1%
-1%


1%
0%
0%
0%


0%
0%
0%
0%


1%
0%
-1%
1%


% diff V4 to V6














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


29%
-22%
-27%
-1%


9%
-15%
-18%
0%


6%
-8%
-11%
1%


8%
-10%
-13%
-1%

Note: 2064-109; z/VM 5.1.0; TCP/IP 510; V5 denotes IPv4 over IPv6 capable

Table 3. Guest LAN QDIO - RR


Number of clients


1


10


20


50


MTU 1492
runid V4
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans



vg4rn01
1341.98
1.10
0.70
0.40



vg4rn10
2791.62
0.98
0.66
0.33



vg4rn20
2792.03
0.97
0.66
0.32



vg4rn50
2730.10
1.01
0.70
0.32


runid V5
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vg5rn01
1341.23
1.08
0.69
0.39


vg5rn10
2798.36
0.98
0.65
0.33


vg5rn20
2797.05
0.97
0.65
0.31


vg5rn50
2730.91
1.01
0.70
0.32


runid V6
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vg6rn01
1340.28
1.10
0.71
0.40


vg6rn10
2770.68
0.99
0.66
0.33


vg6rn20
2774.36
0.98
0.66
0.32


vg6rn50
2715.20
1.02
0.70
0.32


% diff V4 to V5














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


0%
-2%
-1%
-2%


0%
0%
0%
0%


0%
0%
0%
0%


0%
0%
0%
0%


% diff V4 to V6














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


0%
1%
1%
-1%


-1%
1%
1%
0%


-1%
1%
1%
0%


-1%
0%
1%
0%


MTU 8992
runid V4
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans



vg4rj01
1339.68
1.09
0.69
0.40



vg4rj10
2793.06
0.98
0.65
0.33



vg4rj20
2792.27
0.97
0.66
0.31



vg4rj50
2700.01
1.03
0.71
0.32


runid V5
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vg5rj01
1340.51
1.09
0.69
0.39


vg5rj10
2796.73
0.98
0.65
0.32


vg5rj20
2789.85
0.97
0.66
0.32


vg5rj50
2717.61
1.02
0.70
0.32


runid V6
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vg6rj01
1340.78
1.09
0.69
0.39


vg6rj10
2793.82
0.98
0.65
0.33


vg6rj20
2789.51
0.97
0.65
0.32


vg6rj50
2726.55
1.01
0.70
0.32


% diff V4 to V5














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


0%
0%
0%
-1%


0%
0%
0%
0%


0%
0%
0%
0%


1%
-1%
-1%
0%


% diff V4 to V6














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


0%
0%
0%
-1%


0%
0%
0%
0%


0%
0%
0%
0%


1%
-1%
-1%
-1%

Note: 2064-109; z/VM 5.1.0; TCP/IP 510; V5 denotes IPv4 over IPv6 capable

Table 4. QDIO - STR


Number of clients


1


10


20


50


MTU 1492
runid V4
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB



vq4sn01
79.27
11.69
7.63
4.06



vq4sn10
84.30
13.06
8.39
4.67



vq4sn20
80.63
15.12
9.75
5.37



vq4sn50
80.07
18.19
11.73
6.46


runid V5
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


vq5sn01
71.33
12.85
8.68
4.17


vq5sn10
68.17
18.15
12.16
5.99


vq5sn20
69.07
21.21
14.22
6.99


vq5sn50
69.07
24.91
16.54
8.37


runid V6
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


vq6sn01
59.30
13.01
8.84
4.17


vq6sn10
71.07
17.91
12.02
5.90


vq6sn20
69.63
21.16
14.21
6.96


vq6sn50
70.80
24.56
16.45
8.11


% diff V4 to V5














MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


-10%
10%
14%
3%


-19%
39%
45%
28%


-14%
40%
46%
30%


-14%
37%
41%
30%


% diff V4 to V6














MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


-25%
11%
16%
3%


-16%
37%
43%
26%


-14%
40%
46%
30%


-12%
35%
40%
26%


MTU 8992
runid V4
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB



vq4sj01
115.10
9.33
5.66
3.67



vq4sj10
117.93
12.46
7.65
4.81



vq4sj20
117.90
12.71
7.80
4.90



vq4sj50
106.50
13.40
7.82
5.58


runid V5
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


vq5sj01
115.10
9.42
5.75
3.67


vq5sj10
117.90
12.60
7.79
4.80


vq5sj20
117.83
13.00
8.05
4.96


vq5sj50
104.53
13.98
8.32
5.65


runid V6
MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


vq6sj01
115.03
9.43
5.77
3.66


vq6sj10
117.70
12.29
7.58
4.72


vq6sj20
117.57
12.54
7.74
4.80


vq6sj50
106.07
13.51
7.92
5.59


% diff V4 to V5














MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


0%
1%
2%
0%


0%
1%
2%
0%


0%
2%
3%
1%


-2%
4%
6%
1%


% diff V4 to V6














MB/sec
Total CPU msec/MB
Emul CPU msec/MB
CP CPU msec/MB


0%
1%
2%
0%


0%
-1%
-1%
-2%


0%
-1%
-1%
-2%


0%
1%
1%
0%

Note: 2064-109; z/VM 5.1.0; TCP/IP 510; V5 denotes IPv4 over IPv6 capable

Table 5. QDIO - CRR


Number of clients


1


10


20


50


MTU 1492
runid V4
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans



vq4cn01
147.25
1.96
1.41
0.56



vq4cn10
439.57
1.93
1.38
0.55



vq4cn20
519.11
1.90
1.36
0.54



vq4cn50
656.15
1.98
1.42
0.56


runid V5
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vq5cn01
141.88
2.04
1.45
0.58


vq5cn10
434.73
2.00
1.43
0.58


vq5cn20
522.55
1.98
1.41
0.57


vq5cn50
675.16
2.04
1.47
0.57


runid V6
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vq6cn01
151.83
2.19
1.56
0.63


vq6cn10
446.06
2.16
1.54
0.62


vq6cn20
537.74
2.15
1.54
0.62


vq6cn50
661.57
2.24
1.58
0.66


% diff V4 to V5














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


-4%
4%
3%
5%


-1%
4%
3%
6%


1%
5%
4%
6%


3%
3%
3%
2%


% diff V4 to V6














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


3%
12%
11%
14%


1%
12%
11%
14%


4%
13%
13%
14%


1%
13%
11%
18%


MTU 8992
runid V4
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans



vq4cj01
160.69
1.56
1.11
0.44



vq4cj10
437.98
2.03
1.60
0.43



vq4cj20
517.90
2.03
1.60
0.43



vq4cj50
682.84
1.93
1.49
0.44


runid V5
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vq5cj01
158.15
1.57
1.13
0.44


vq5cj10
435.97
2.03
1.60
0.43


vq5cj20
514.56
2.03
1.61
0.43


vq5cj50
648.80
2.05
1.58
0.47


runid V6
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vq6cj01
179.05
1.71
1.22
0.50


vq6cj10
460.01
1.65
1.25
0.40


vq6cj20
539.64
1.60
1.19
0.41


vq6cj50
725.19
1.90
1.45
0.44


% diff V4 to V5














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


-2%
1%
2%
0%


0%
0%
0%
0%


-1%
0%
0%
0%


-5%
7%
7%
6%


% diff V4 to V6














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


11%
10%
9%
12%


5%
-18%
-22%
-6%


4%
-21%
-26%
-5%


6%
-2%
-2%
0%

Note: 2064-109; z/VM 5.1.0; TCP/IP 510; V5 denotes IPv4 over IPv6 capable


Table 6. QDIO - RR


Number of clients


1


10


20


50


MTU 1492
runid V4
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans



vq4rn01
992.92
0.51
0.35
0.16



vq4rn10
2605.85
0.48
0.33
0.15



vq4rn20
3089.88
0.48
0.33
0.15



vq4rn50
3819.15
0.51
0.36
0.15


runid V5
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vq5rn01
1011.29
0.51
0.35
0.16


vq5rn10
2612.15
0.47
0.33
0.15


vq5rn20
3098.32
0.48
0.33
0.15


vq5rn50
3835.60
0.51
0.36
0.15


runid V6
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vq6rn01
1008.28
0.50
0.35
0.16


vq6rn10
2604.14
0.47
0.33
0.15


vq6rn20
2588.53
0.48
0.33
0.15


vq6rn50
3886.89
0.51
0.36
0.15


% diff V4 to V5














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


2%
-2%
-1%
-2%


0%
-1%
-1%
0%


0%
0%
0%
1%


0%
0%
0%
1%


% diff V4 to V6














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


2%
-2%
-1%
-4%


0%
-1%
-1%
-2%


-16%
0%
0%
0%


2%
0%
0%
0%


MTU 8992
runid V4
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans



vq4rj01
1012.83
0.50
0.35
0.15



vq4rj10
2624.22
0.47
0.33
0.15



vq4rj20
3120.64
0.48
0.33
0.15



vq4rj50
3842.14
0.51
0.35
0.15


runid V5
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vq5rj01
1013.60
0.50
0.34
0.15


vq5rj10
2627.53
0.47
0.32
0.15


vq5rj20
3113.63
0.48
0.33
0.15


vq5rj50
3771.75
0.50
0.35
0.15


runid V6
trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


vq6rj01
1006.37
0.50
0.35
0.15


vq6rj10
2544.41
0.50
0.33
0.15


vq6rj20
2553.34
0.50
0.33
0.15


vq6rj50
3733.04
0.50
0.36
0.15


% diff V4 to V5














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


0%
-1%
-1%
-1%


0%
0%
-1%
0%


0%
-1%
-1%
0%


-2%
0%
-1%
1%


% diff V4 to V6














trans/sec
Total CPU msec/trans
Emul CPU msec/trans
CP CPU msec/trans


-1%
0%
1%
-1%


-3%
0%
0%
0%


-18%
0%
-1%
0%


-3%
0%
0%
0%

Note: 2064-109; z/VM 5.1.0; TCP/IP 510; V5 denotes IPv4 over IPv6 capable

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