[Nishanth Shyamkumar]

Hi,

I was able to get ~1Gbps performance with TCP, however there is always a slight mismatch between packets sent and received as reported by iperf3, with couple of retries during the 1st second.
I used a UDP connection instead and I am seeing a consistent behaviour of reasonable amount of losses on the 1st second across runs.
I am using the same notebook as mentioned above, but replaced the client command with the following:
iperf3 -c 192.168.2.10 -u -l 1300 -b 600M

I have pasted the results for multiple runs with the above mentioned values. Is there an explanation for this drop, mostly at the first second.

Accepted connection from 192.168.1.10, port 36772
[ 5] local 192.168.2.10 port 5201 connected to 192.168.1.10 port 33996
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-1.00 sec 69.7 MBytes 585 Mbits/sec 0.044 ms 501/56731 (0.88%)
[ 5] 1.00-2.00 sec 71.5 MBytes 600 Mbits/sec 0.052 ms 0/57691 (0%)
[ 5] 2.00-3.00 sec 71.5 MBytes 600 Mbits/sec 0.052 ms 0/57696 (0%)
[ 5] 3.00-4.00 sec 71.5 MBytes 600 Mbits/sec 0.049 ms 0/57690 (0%)
[ 5] 4.00-5.00 sec 71.5 MBytes 599 Mbits/sec 0.052 ms 58/57694 (0.1%)
[ 5] 5.00-6.00 sec 71.5 MBytes 600 Mbits/sec 0.063 ms 0/57691 (0%)
[ 5] 6.00-7.00 sec 71.5 MBytes 600 Mbits/sec 0.057 ms 0/57694 (0%)
[ 5] 7.00-8.00 sec 71.5 MBytes 600 Mbits/sec 0.055 ms 0/57691 (0%)
[ 5] 8.00-9.00 sec 71.5 MBytes 600 Mbits/sec 0.057 ms 0/57693 (0%)
[ 5] 9.00-10.00 sec 71.5 MBytes 600 Mbits/sec 0.018 ms 0/57709 (0%)
[ 5] 10.00-10.02 sec 1.12 MBytes 600 Mbits/sec 0.004 ms 0/901 (0%)
– – – – – – – – – – – – – – – – – – – – – – – – –
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.02 sec 715 MBytes 598 Mbits/sec 0.004 ms 559/576881 (0.097%) receiver
———————————————————–
Server listening on 5201
———————————————————–
Accepted connection from 192.168.1.10, port 46278
[ 5] local 192.168.2.10 port 5201 connected to 192.168.1.10 port 39296
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-1.00 sec 69.6 MBytes 584 Mbits/sec 0.058 ms 598/56731 (1.1%)
[ 5] 1.00-2.00 sec 71.5 MBytes 600 Mbits/sec 0.055 ms 0/57692 (0%)
[ 5] 2.00-3.00 sec 71.5 MBytes 600 Mbits/sec 0.053 ms 0/57693 (0%)
[ 5] 3.00-4.00 sec 71.5 MBytes 599 Mbits/sec 0.112 ms 0/57634 (0%)
[ 5] 4.00-5.00 sec 71.6 MBytes 601 Mbits/sec 0.041 ms 5/57751 (0.0087%)
[ 5] 5.00-6.00 sec 71.5 MBytes 600 Mbits/sec 0.064 ms 0/57690 (0%)
[ 5] 6.00-7.00 sec 71.5 MBytes 600 Mbits/sec 0.057 ms 0/57694 (0%)
[ 5] 7.00-8.00 sec 71.5 MBytes 600 Mbits/sec 0.043 ms 0/57690 (0%)
[ 5] 8.00-9.00 sec 71.5 MBytes 600 Mbits/sec 0.057 ms 0/57695 (0%)
[ 5] 9.00-10.00 sec 71.5 MBytes 600 Mbits/sec 0.063 ms 0/57692 (0%)
[ 5] 10.00-10.02 sec 1.13 MBytes 610 Mbits/sec 0.013 ms 0/914 (0%)
– – – – – – – – – – – – – – – – – – – – – – – – –
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.02 sec 714 MBytes 598 Mbits/sec 0.013 ms 603/576876 (0.1%) receiver
———————————————————–
Server listening on 5201
———————————————————–
Accepted connection from 192.168.1.10, port 42888
[ 5] local 192.168.2.10 port 5201 connected to 192.168.1.10 port 36183
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-1.00 sec 70.3 MBytes 590 Mbits/sec 0.063 ms 0/56730 (0%)
[ 5] 1.00-2.00 sec 71.5 MBytes 600 Mbits/sec 0.052 ms 0/57694 (0%)
[ 5] 2.00-3.00 sec 71.5 MBytes 600 Mbits/sec 0.061 ms 0/57691 (0%)
[ 5] 3.00-4.00 sec 71.5 MBytes 600 Mbits/sec 0.054 ms 0/57693 (0%)
[ 5] 4.00-5.00 sec 71.5 MBytes 600 Mbits/sec 0.051 ms 0/57693 (0%)
[ 5] 5.00-6.00 sec 71.5 MBytes 600 Mbits/sec 0.063 ms 0/57691 (0%)
[ 5] 6.00-7.00 sec 71.5 MBytes 600 Mbits/sec 0.057 ms 0/57692 (0%)
[ 5] 7.00-8.00 sec 71.5 MBytes 600 Mbits/sec 0.048 ms 0/57695 (0%)
[ 5] 8.00-9.00 sec 71.5 MBytes 600 Mbits/sec 0.049 ms 0/57690 (0%)
[ 5] 9.00-10.00 sec 71.5 MBytes 600 Mbits/sec 0.062 ms 0/57691 (0%)
[ 5] 10.00-10.02 sec 1.07 MBytes 577 Mbits/sec 0.053 ms 0/867 (0%)
– – – – – – – – – – – – – – – – – – – – – – – – –
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.02 sec 715 MBytes 599 Mbits/sec 0.053 ms 0/576827 (0%) receiver
———————————————————–
Server listening on 5201
———————————————————–
Accepted connection from 192.168.1.10, port 53714
[ 5] local 192.168.2.10 port 5201 connected to 192.168.1.10 port 46178
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-1.00 sec 69.1 MBytes 580 Mbits/sec 0.056 ms 965/56730 (1.7%)
[ 5] 1.00-2.00 sec 71.5 MBytes 600 Mbits/sec 0.045 ms 0/57695 (0%)
[ 5] 2.00-3.00 sec 71.5 MBytes 600 Mbits/sec 0.050 ms 0/57689 (0%)
[ 5] 3.00-4.00 sec 71.5 MBytes 600 Mbits/sec 0.049 ms 0/57693 (0%)
[ 5] 4.00-5.00 sec 71.5 MBytes 600 Mbits/sec 0.048 ms 0/57692 (0%)
[ 5] 5.00-6.00 sec 71.5 MBytes 600 Mbits/sec 0.045 ms 0/57692 (0%)
[ 5] 6.00-7.00 sec 71.5 MBytes 600 Mbits/sec 0.042 ms 0/57695 (0%)
[ 5] 7.00-8.00 sec 71.5 MBytes 600 Mbits/sec 0.048 ms 0/57688 (0%)
[ 5] 8.00-9.00 sec 71.5 MBytes 600 Mbits/sec 0.051 ms 0/57693 (0%)
[ 5] 9.00-10.00 sec 71.5 MBytes 600 Mbits/sec 0.054 ms 0/57692 (0%)
[ 5] 10.00-10.02 sec 1.07 MBytes 574 Mbits/sec 0.054 ms 0/867 (0%)
– – – – – – – – – – – – – – – – – – – – – – – – –
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.02 sec 714 MBytes 598 Mbits/sec 0.054 ms 965/576826 (0.17%) receiver

[Nishanth Shyamkumar]

Hi Paul,

Do you know if the slice.submit() would rebuild all the VMs and network components or will it correctly update only the L2 link information? I don’t want to lose the files and environment setup on my VMs due to a slice rebuild.

[Nishanth Shyamkumar]

Hi, with Georgios’ code snippet, the renewal was successfully extended. What was missing was the ‘tz.tzutc()’  when using datetime.now(), which needs to be explicitly defined as the %z argument.

[Nishanth Shyamkumar]

I tried with less than 7 days, but it fails with the same error.

For example, the exception when I try to extend it by 1 day:

Exception: Failed to renew slice: Status.INVALID_ARGUMENTS, Lease End Time 2023-08-16 23:54:38 should be in format: %Y-%m-%d %H:%M:%S %z

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