VMmark

View Only

some issues happen when set MTU to 9000

jiang jianfeng posted Feb 25, 2025 09:50 AM

I set the MTU of workload vSwitch to 9000,and i set all the VMs ens192 MTU=9000 too. I try ping (8000bytes)and SSH between VMs and the result is ok.

But the result of vmmark test is all failed.

How to change the MTU of workload network?

VMmark4-Tilescore.py : v1.0.4 09192024
Tiles = 1.0 : Full Tiles = 1 : Fractional Tiles = 0.0
Referencing_tile: 0.
First Sample : 1740450120 : Mon Feb 24 18:22:00 2025 PST : Tue Feb 25 02:22:00 2025 UTC
Info: t = 1 : Time = 1740450180 : Full Tiles = 1 : Fractional Tiles = 0.0 : App Workloads = 10
Run_start : 1740450120 : Mon Feb 24 18:22:00 2025 PST : Tue Feb 25 02:22:00 2025 UTC
Time_start : 1740450180 : Mon Feb 24 18:23:00 2025 PST : Tue Feb 25 02:23:00 2025 UTC
Time_end : 1740460560 : Mon Feb 24 21:16:00 2025 PST : Tue Feb 25 05:16:00 2025 UTC
Run_end : 1740460920 : Mon Feb 24 21:22:00 2025 PST : Tue Feb 25 05:22:00 2025 UTC
Duration : 173.00 minutes
Steady_state_start : 1740451980 : Mon Feb 24 18:53:00 2025 PST : Tue Feb 25 02:53:00 2025 UTC
Steady_state_end : 1740459180 : Mon Feb 24 20:53:00 2025 PST : Tue Feb 25 04:53:00 2025 UTC
Phase_0_begin : 1740451980 : Mon Feb 24 18:53:00 2025 PST : Tue Feb 25 02:53:00 2025 UTC
Phase_1_begin : 1740454380 : Mon Feb 24 19:33:00 2025 PST : Tue Feb 25 03:33:00 2025 UTC
Phase_2_begin : 1740456780 : Mon Feb 24 20:13:00 2025 PST : Tue Feb 25 04:13:00 2025 UTC

TILE_0_Scores: WVAuctionVM WVAuctionK8S DVDStoreA DVDStoreB DVDStoreC NoSQLBenchA NoSQLBenchB NoSQLBenchC SocialNetwork Standby
p0 9428.28 465.37 2171.35 1499.62 986.20 42054.40 42058.20 42056.99 49.51 1.00
p1 11456.40 464.39 2502.75 1826.22 1282.88 51374.94 51374.73 51373.30 54.63 1.00
p2 12099.62 465.42 2401.20 1698.78 1143.15 50143.82 50144.17 50143.20 57.19 1.00

TILE_0_Ratios: WVAuctionVM WVAuctionK8S DVDStoreA DVDStoreB DVDStoreC NoSQLBenchA NoSQLBenchB NoSQLBenchC SocialNetwork Standby Geo.Mean
p0 0.67 0.05 0.75 0.70 0.64 0.74 0.74 0.74 0.69 1.00 0.53
p1 0.82 0.05 0.86 0.85 0.84 0.91 0.91 0.91 0.76 1.00 0.62
p2 0.86 0.05 0.83 0.79 0.75 0.89 0.89 0.89 0.79 1.00 0.61

TILE_0_QoS: WVAuctionVM% WVAuctionK8S% DVDStoreA DVDStoreB DVDStoreC NoSQLBenchA NoSQLBenchB NoSQLBenchC
p0 47.15 | 33.25+2250.53 | 100.00+ 1154.78* 1295.89* 1529.58* 0.56 0.56 0.56
p1 36.27 | 30.44+2250.60 | 100.00+ 745.63 807.18 957.40 0.48 0.46 0.47
p2 34.43 | 30.98+2250.58 | 100.00+ 859.99* 974.32 1139.89* 0.51 0.49 0.49

p0_score = 0.53
p1_score = 0.62
p2_score = 0.61

Infrastructure_Operations_Scores: vMotion SVMotion XVMotion Deploy
Completed_Ops_PerHour 28.00 13.00 14.00 12.50
Avg_Seconds_To_Complete 6.96 56.81 47.43 245.52
Failures 0.00 0.00 0.00 0.00
Ratio 0.95 1.00 1.08 0.86
Number_Of_Threads 1 1 1 1

Warnings Messages::
p0 : WVAuctionVM0 Exceptions : 400963
p0 : WVAuctionK8S0 Exceptions : 1120032
p1 : WVAuctionVM0 Exceptions : 15313665
p1 : WVAuctionK8S0 Exceptions : 1085012
p2 : WVAuctionVM0 Exceptions : 16716259
p2 : WVAuctionK8S0 Exceptions : 1119976
rampdown : WVAuctionVM0 Exceptions : 9669785
rampdown : WVAuctionK8S0 Exceptions : 644017

Summary ::
Run_Is_NOT_Compliant
Turbo_Setting : False
Number_of_Workloads_Missing : 0
Number_of_Compliance_Issues (identified by '*' or '+') : 11
Issues Found :
Tile0-WVAuctionVM-p0
Tile0-WVAuctionK8S-p0
Tile0-DVDStoreA-p0
Tile0-DVDStoreB-p0
Tile0-DVDStoreC-p0
Tile0-WVAuctionVM-p1
Tile0-WVAuctionK8S-p1
Tile0-WVAuctionVM-p2
Tile0-WVAuctionK8S-p2
Tile0-DVDStoreA-p2
Tile0-DVDStoreC-p2
Median_Phase : p2

Unreviewed_VMmark4_Applications_Score : 0.61
Unreviewed_VMmark4_Infrastructure_Score : 0.97
Unreviewed_VMmark4_Score : 0.68 @ 1 Tiles (NC)

Results table generated : VMmark4-Results-Table.html
Graph generated : VMmark4-Graph-Throughput.html
Graph generated : VMmark4-Graph-QoS.html
Graph generated : VMmark4-Graph-Infrastructure-Ops.html
Graph generated : 198.168.55.78-powermetrics.html
Graph generated : 198.168.55.77-powermetrics.html

Broadcom Employee Benjamin Hoflich posted Feb 25, 2025 04:28 PM

Note that in the Run and Reporting Rules section 3.2.5.3d, each workload VM must use the default MTU of 1500.
I'm not sure there has been testing with this setting changed, or if it should even be expected to work.

Will it run with more success with just the vSwitch MTU 9000?

jiang jianfeng posted Feb 26, 2025 07:39 AM

yes it run with success with just the vSwitch MTU 9000. Does it work for increase performance just set vSwitch MTC 9000?

Broadcom Employee Benjamin Hoflich posted Feb 26, 2025 11:27 AM

My thinking is that the MTU 9000 would be primarily beneficial to the performance of infrastructure operations (such as vMotions), network storage traffic, and also to vSAN, if in use.