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Detailed Studies of GVP Media Server Behavior on Linux

Because MP3 16kbps produces better results than 32kbps on Windows, Linux tests focused on MP3 16kpbs testing profiles. Also based on previous results on Windows, we chose two typical Hardware Profiles for Linux testing: Hardware Profile 1 for physical server testing, and Hardware Profile 4 with Virtual Machine Profile 4 for virtual machine environment testing.

Parameter Adjustments

These adjustments achieve higher port capacity:

Parameter Default Value Adjusted Value
mpc.recordnumparallelpost 30 300
mpc.recordpostretrybackoff 120000 15000
mpc.recordpostretrycount 3 1
mpc.mediamgr.recordwritetimeinterval 1000 10000
fm.http_proxy (empty) (squid bypassed)

Comparisons with Windows

Physical Server on Single Hex Core

These tests use Software Profile 1a on Hardware Profile 1 for a physical server. Here are three graphs illustrating overall system CPU usage, MCP CPU usage and memory usage:

Figure 73: Comparison of System CPU Usage on a physical server, MP3 16kbps without encryption, RH EL 6.5 vs. Windows 2008 R2


Figure 74: Comparison of MCP CPU Usage on a physical server, MP3 16kbps without encryption, RH EL 6.5 vs. Windows 2008 R2


Figure 75: Comparison of MCP Memory Usage on a physical server, MP3 16kbps without encryption, RH EL 6.5 vs. Windows 2008 R2

Linux uses more resources (CPU, memory etc) than Windows, and so lower capacity is achieved on Linux with a 37.5% reduction (150 vs. 240) for preferred ports and a 22.2% reduction (210 vs. 270) for peak ports.

The two graphs below compare audio quality in terms of max jitter and max delta:

Figure 76: Comparison of Max Jitter on A physical server, MP3 16kbps without encryption, RH EL 6.5 vs. Windows 2008 R2


Figure 77: Comparison of Max Delta on A physical server, MP3 16kbps without encryption, RH EL 6.5 vs. Windows 2008 R2

Note that Max Jitter is somewhat close between Windows and Linux. But Linux has a lower value at lower ports and a slightly higher value on higher ports. The Max Delta shows that Linux has the higher value even though it is nearly the same for both Windows and Linux at lower ports.

System disk IOPS is illustrated in this table for Linux EL 6.5:

Figure 78: System Disk IOPS on a physical server of single hex core on EL 6.5, MP3 only 16 kbps
Ports Disk IOPS Physical Server
Total Reads Writes
60 12.75 0.000 12.754
120 23.12 0.000 23.117
150 27.65 0.000 27.645
180 32.15 0.000 32.150
210 36.73 0.000 36.729
240 41.57 0.000 41.568

The graph below compares System Disk IOPS performance on Linux and Windows physical servers:

Figure 79: Comparison of System Disk IOPS on a Physical Server, MP3 16kbps without encryption, RH EL 6.5 vs. Windows 2008 R2

Note that IOPS on both Windows and Linux are similar; and so Disk IOPS is related to the test profile, and irrelevant to a particular OS. So the IOPS numbers from the previous Windows testing can be used generally for both Windows and Linux.

VMs on Dual Hex Cores Server

These tests use SW Profile 1a on HW Profile 1 with VM Profile 4 for virtual machine environment testing. Below are three graphs illustrating overall system CPU usage, MCP CPU usage and memory usage:


Figure 80: Comparison of System CPU Usage on VM env, MP3 16kbps without encryption, RH EL 6.5 vs. Windows 2008 R2

You can observe the same trend as with the physical server results in the previous section Linux consumes more CPU resources. Below are two graphs of audio quality-related metrics that show the same thing.


Figure 81: Comparison of Max Jitter on VM env, MP3 16kbps without encryption, RH EL 6.5 vs. Win 2008 R2
Figure 82: Comparison of Max Delta on VM env, MP3 16kbps without encryption, RH EL 6.5 vs. Windows 2008 R2

As observed on the above graphs, 540 ports are recommended and preferred. This is a 25% reduction compared with Windows 2008 R2 (540 vs. 720). Peak capacity would be 660 ports, which is a 21.4% reduction compared to Windows 2008 R2 (660 vs. 840). Similar reductions were also observed on physical server tests in the previous section.

The disk IOPS is displayed here:

Figure 83: Disk IOPS from overall 6 VMs of dual hex core, MP3 only 16 kbps, on EL 6.5
Ports Overall 6 VMs Disk IOPS SSD Drive Disk IOPS
Total Reads Writes Total Reads Writes
120 28.17 0.00 28.17 24.011 0.000 24.011
240 49.78 0.00 49.78 44.590 0.000 44.590
360 71.11 0.00 71.11 65.747 0.000 65.747
420 81.59 0.00 81.59 76.058 0.000 76.058
480 92.37 0.00 92.37 86.767 0.000 86.767
540 102.96 0.00 102.96 97.305 0.000 97.305
600 112.33 0.00 112.33 106.727 0.000 106.727
660 122.06 0.00 122.06 116.440 0.000 116.440
720 130.82 0.00 130.82 125.121 0.000 125.121

The graph below compares the above table with the corresponding table for Windows, for the same MP3-only 16 kbps profile:

Figure 84: Comparison of System Disk IOPS on VM env, MP3 16kbps without encryption, RH EL 6.5 vs. Windows 2008 R2

Note that disk IOPS results for Linux and Windows are very close, and corresponds to the results on a physical server in the previous section.

The data throughput for this MP3-only profile on EL 6.5 is illustrated below:

Figure 85: Data throughputs from overall 6 VMs of dual hex core, MP3 only 16 kbps, on EL 6.5
Ports Overall Disk KB/sec SSD Drive Disk KB/sec
Total KB/sec Read KB/sec Write KB/sec Total KB/sec Read KB/sec Write KB/sec
120 417.70 0.00 417.70 389.474 0.000 389.474
240 788.58 0.00 788.58 751.418 0.000 751.418
360 1145.77 0.00 1145.77 1104.237 0.000 1104.237
420 1317.38 0.00 1317.38 1274.484 0.000 1274.484
480 1496.20 0.00 1496.20 1451.114 0.000 1451.114
540 1677.83 0.00 1677.83 1627.798 0.000 1627.798
600 1843.65 0.00 1843.65 1795.706 0.000 1795.706
660 2023.36 0.00 2023.36 1974.070 0.000 1974.070
720 2193.62 0.00 2193.62 2142.769 0.000 2142.769

Comparing MP3 only and MP3 + WAV

Physical Server on Single Hex Core

This test uses SW Profile 2a (MP3 16 kbps + wav without encryption) on HW Profile 1 for a physical server, compared which SW Profile 1a (MP3 only 16 kbps without encryption) is used as a baseline for comparison. Below are three graphs illustrating overall system CPU usage, MCP CPU usage and memory usage:

Figure 86: Comparison of System CPU Usage on a Physical Server, MP3 + wav vs. MP3 only, on RH EL 6.5


Figure 87: Comparison of MCP CPU Usage on a Physical Server, MP3 + wav vs. MP3 only, on RH EL 6.5


Figure 88: Comparison of MCP Memory Usage on a Physical Server, MP3 + wav vs. MP3 only, on RH EL 6.5

The comparison shows apparent higher MCP usage and overall system CPU usage for the MP3 + wav profile. However, the MCP memory usage is not significantly higher.

The audio quality metric also shows some differences, below:

Figure 89: Comparison of Max Jitter on a Physical Server, MP3 + wav vs. MP3 only, on RH EL 6.5
Figure 90: Comparison of Max Delta on a Physical Server, MP3 + wav vs. MP3 only, on RH EL 6.5

Note that lower capacities would be achieved for the MP3 + WAV profile. 90 ports would be recommended and preferred, a 40% reduction (90 vs. 150) compared with the MP3-only profile, while 150 ports would be peak capacity a 28.6% reduction (150 vs. 210).

System disk IOPS is listed in the following table:

Figure 91: System Disk IOPS on a physical server of single hex core on EL 6.5, MP3 16 kbps + wav
Ports Physical Server Disk IOPS
Total Reads Writes
30 15.18 0.008 15.17
60 26.70 0.000 26.70
90 35.53 0.003 35.53
120 46.04 0.002 46.04
150 55.44 0.000 55.44
180 65.50 1.520 63.98

The graph below compares disk IOPS with the MP3-only profile:

Figure 92: Comparison of System Disk IOPS on a Physical Server, MP3 + wav vs. MP3 only, on RH EL 6.5

The MP3-only profile is almost double the disk IOPS for MP3 + wav profile, as observed in the Windows testing.

VMs on Dual Hex Cores Server

A similar trend of overall CPU usage occurs in the Virtual Machine environment.

Figure 93: Comparison of System CPU Usage on VM env, MP3 + wav vs. MP3 only, on RH EL 6.5

The audio quality metrics shows similar trends as on a physical server.

Figure 94: Comparison of Max Jitter on VM env, MP3 + wav vs. MP3 only, on RH EL 6.5


Figure 95: Comparison of Max Delta on VM env, MP3 + wav vs. MP3 only, on RH EL 6.5

480 ports are recommended and preferred for this MP3 + wav profile, an 11.1% reduction (480 vs. 540 for MP3 only); peak would be 660, a 9.1% reduction (600 vs. 660 for MP3 only).

Below is a table to illustrate overall 6 VMs disk IOPS:

Figure 96: System Disk IOPS on a VM environment of dual hex cores on EL 6.5, MP3 16 kbps + wav
Ports Overall 6 VMs Disk IOPS SSD Drive Disk IOPS
Total Reads Writes Total Reads Writes
120 52.99 0.00 52.99 48.728 0.000 48.728
240 100.50 0.00 100.50 95.174 0.000 95.174
360 144.34 0.00 144.34 138.864 0.000 138.864
420 164.65 0.00 164.65 158.979 0.000 158.979
480 183.45 0.00 183.45 177.711 0.000 177.711
540 207.27 0.00 207.27 201.564 0.000 201.564
600 224.97 0.00 224.97 219.197 0.000 219.197
660 275.49 0.00 275.49 269.584 0.000 269.584
720 187.34 0.00 187.33 179.984 0.001 179.983

Compared with the MP3-only profile, overall 6 VM disk IOPS for MP3 + wav profile shows almost double IOPS, as in the previous physical server section.


Figure 97: Comparison of System Disk IOPS on VM env, MP3 + wav vs. MP3 only, on RH EL 6.5

The table below illustrats overall data throughput for this MP3 + wav profile on VMs of RH EL 6.5 environment.

Figure 98: Data throughputs from overall 6 VMs of dual hex core, MP3 16 kbps + wav, on EL 6.5
Ports Overall Disk KB/sec SSD Drive Disk KB/sec
Total KB/sec Read KB/sec Write KB/sec Total KB/sec Read KB/sec Write KB/sec
120 2376.30 0.00 2376.30 2347.222 0.000 2347.222
240 4684.79 0.00 4684.79 4646.371 0.000 4646.371
360 6975.83 0.00 6975.83 6933.441 0.000 6933.441
420 8100.79 0.00 8100.79 8056.843 0.001 8056.842
480 9242.32 0.00 9242.32 9195.871 0.001 9195.871
540 10391.78 0.00 10391.78 10344.249 0.001 10344.249
600 11512.54 0.00 11512.54 11462.150 0.001 11462.149
660 12804.19 0.01 12804.18 12752.305 0.001 12752.304
720 9380.58 0.00 9380.58 9336.194 0.003 9336.191

Encryption

MP3 16 kbps Only on a Physical Server of Single Hex Core

This is SW Profile 3a (MP3 16 kbps only with encryption) on HW Profile 1 for a physical server which SW Profile 1a (MP3 only 16 kbps without encryption) is used as baseline to compare with. Here are the three graphs illustrating overall system CPU usage, MCP CPU usage and memory usage:


Figure 99: Comparison of System CPU Usage on a Physical Server, MP3 only 16 kbps encryption vs. non-encryption, on RH EL 6.5


Figure 100: Comparison of MCP CPU Usage on a Physical Server, MP3 only 16 kbps encryption vs. non-encryption, on RH EL 6.5
Figure 101: Comparison of MCP Memory Usage on a Physical Server, MP3 only 16 kbps encryption vs. non-encryption, on RH EL 6.5

It can be observed that both system CPU and MCP CPU are quite inline to each other between encryption and non-encryption profiles while MCP memory for encryption is slightly higher than non-encryption.

Let us look at audio quality metrics further:

Figure 102: Comparison of Max Jitter on a Physical Server, MP3 only, Encryption vs. Non-encryption on EL 6.5


Figure 103: Comparison of Max Delta on a Physical Server, MP3 only, Encryption vs. Non-encryption on EL 6.5

Max Jitter is similar for both encryption and non-encryption scenarios, as are the Max Delta metrics. Thus, the preferred ports (540) and peak ports (660) for encryption are the same as for non-encryption.

System disk IOPS is illustrated below:

Figure 104: System Disk IOPS on a Physical Server on EL 6.5, MP3 16 kbps only, Encryption
Ports Physical Server Disk IOPS
Total Reads Writes
30 8.12 0.000 8.122
60 14.22 0.000 14.220
90 19.98 0.000 19.975
120 25.12 0.000 25.122
150 30.62 0.000 30.621
180 35.07 0.000 35.074
210 39.83 0.000 39.828
240 44.74 0.000 44.739

The graph below compares encryption with non-encryption:

Figure 105: Comparison of System Disk IOPS on a Physical Server, MP3 only, on EL 6.5, Encryption vs. Non-encryption

Slightly higher system disk IOPS occurs in the encryption scenario, likely caused by the extra key/pem files required for encryption.

MP3 16 kbps Only on VMs of Dual Hex Cores

This test uses SW Profile 3a (MP3 16 kbps only with encryption) on VM Profile 4 configured as HW Profile 0 for a VM environment, compared with SW Profile 1a (MP3 only 16 kbps without encryption) on the same hardware specification. Below are graphs illustrating overall system CPU usage and memory usage:


Figure 106: Comparison of System CPU Usage on VMs, MP3 only 16 kbps encryption vs. non-encryption, on RH EL 6.5


Figure 107: Comparison of MCP Memory Usage on VMs, MP3 only 16 kbps encryption vs. non-encryption, on RH EL 6.5

As observed in previous physical server graphs, CPU usage is almost the same for both encryption and non-encryption, while MCP memory usage is slightly higher for encryption.

Consider audio quality metrics:


Figure 108: Comparison of Max Jitter on VMs, MP3 only, Encryption vs. Non-encryption on EL 6.5


Figure 109: Comparison of Max Delta on VMs, MP3 only, Encryption vs. Non-encryption on EL 6.5

Similar trends can be observed in the previous physical server section that both encryption and non-encryption achieved similar value for both Max Jitter and Max Delta. So the preferred ports (540) and peak ports (660) for encryption would be the same as non-encryption.

Figure 110: Overall System Disk IOPS on VMs of EL 6.5, MP3 16 kbps only, Encryption
Ports Overall 6 VMs Disk IOPS SSD Drive Disk IOPS
Total Reads Writes Total Reads Writes
120 30.44 0.00 30.44 25.997 0.000 25.997
240 53.41 0.00 53.41 47.939 0.000 47.939
360 75.57 0.00 75.57 70.011 0.000 70.011
420 86.37 0.00 86.37 80.600 0.000 80.600
480 97.32 0.00 97.32 91.564 0.000 91.564
540 108.20 0.00 108.20 102.393 0.000 102.393
600 117.95 0.00 117.95 112.132 0.000 112.132
660 127.85 0.00 127.85 121.911 0.000 121.911
720 136.85 0.00 136.85 130.951 0.000 130.951

The graph below compares encryption with non-encryption:


Figure 111: Comparison of System Disk IOPS on VM env, MP3 only, on EL 6.5, Encryption vs. Non-encryption

As in the previous physical server section, system disk IOPS for encryption is slightly higher than non-encryption.

Data throughput is illustrated in this table:

Figure 112: Data throughputs from overall 6 VMs of dual hex core, MP3 16 kbps only, encryption, on EL 6.5
Ports Overall Disk KB/sec SSD Drive Disk KB/sec
Total KB/sec Read KB/sec Write KB/sec Total KB/sec Read KB/sec Write KB/sec
120 435.55 0.00 435.55 403.192 0.000 403.192
240 822.06 0.00 822.06 780.379 0.000 780.379
360 1186.43 0.00 1186.43 1140.874 0.000 1140.874
420 1359.14 0.00 1359.14 1311.668 0.000 1311.668
480 1549.49 0.00 1549.49 1500.982 0.000 1500.982
540 1719.89 0.00 1719.89 1669.506 0.000 1669.506
600 1905.09 0.00 1905.09 1853.208 0.000 1853.208
660 2081.23 0.00 2081.23 2027.495 0.000 2027.495
720 2269.56 0.00 2269.56 2214.658 0.000 2214.658

MP3 16 kbps + wav on VMs of Dual Hex Cores

This test uses SW Profile 4a (MP3 16 kbps + wav with encryption) on VM Profile 4 configured as HW Profile 1 for a VM environment to compare with SW Profile 2a (MP3 16 kbps + wav without encryption) on the same HW spec. Below are two graphs illustrating overall system CPU usage and memory usage:

Figure 113: Comparison of System CPU Usage on VMs, MP3 16 kbps + wav encryption vs. non-encryption, on RH EL 6.5
Figure 114: Comparison of MCP Memory Usage on VMs, MP3 16 kbps + wav encryption vs. non-encryption, on RH EL 6.5

System CPU usage is quite close to each other for both encryption and non-encryption, while MCP memory usage for encryption is slightly higher than for non-encryption, similar to the previous MP3 only test scenarios.

The audio quality metrics of Max Jitter and Max Delta also show similar trends.

Figure 115: Comparison of Max Jitter on VMs, MP3 + wav, Encryption vs. Non-encryption on EL 6.5


Figure 116: Comparison of Max Delta on VMs, MP3 + wav, Encryption vs. Non-encryption on EL 6.5

The recommended and preferred ports for encryption of MP3 + wav would be 480 the same as non-encryption of MP3 + wav, as is 600 for peak ports.

The table below shows overall system disk IOPS, for reference:

Figure 117: Overall System Disk IOPS on VMs of EL 6.5, MP3 16 kbps + wav, Encryption
Ports Overall 6 VMs Disk IOPS SSD Drive Disk IOPS
Total Reads Writes Total Reads Writes
120 53.97 0.00 53.97 49.506 0.000 49.506
240 102.98 0.00 102.98 97.468 0.000 97.468
360 149.87 0.00 149.87 144.235 0.000 144.235
420 171.89 0.00 171.89 166.144 0.000 166.144
480 196.97 0.00 196.97 191.140 0.000 191.140
540 223.52 0.01 223.51 217.663 0.000 217.663
600 246.26 0.03 246.22 240.216 0.000 240.216
660 296.60 0.00 296.60 290.582 0.000 290.582

The graph below compares encryption with non-encryption, and shows the same trend as observed previously in this section:

Figure 118: Comparison of System Disk IOPS on VM env, MP3 + wav, on EL 6.5, Encryption vs. Non-encryption

Data throughput is also listed below as reference:

Figure 119: Data throughputs from overall 6 VMs of dual hex core, MP3 16 kbps + wav, encryption, on EL 6.5
Ports Overall Disk KB/sec SSD Drive Disk KB/sec
Total KB/sec Read KB/sec Write KB/sec Total KB/sec Read KB/sec Write KB/sec
120 2421.76 0.00 2421.76 2373.612 0.000 2373.612
240 4756.37 0.00 4756.37 4699.737 0.000 4699.737
360 7065.62 0.00 7065.62 7004.491 0.000 7004.491
420 8179.23 0.00 8179.23 8116.591 0.000 8116.591
480 9366.53 0.00 9366.53 9301.426 0.000 9301.426
540 10489.26 0.14 10489.12 10423.230 0.000 10423.230
600 11647.29 0.78 11646.51 11574.973 0.000 11574.973
660 12976.30 0.06 12976.24 12905.764 0.001 12905.763

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This page was last modified on 11 July 2018, at 01:47.