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Issue metadata

Status: WontFix
Owner: ----
Closed: May 2016
Cc:
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 3
Type: Bug



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Slow ssh connection to devservers in chaos lab

Project Member Reported by bmahadev@chromium.org, May 26 2016

Issue description

This bug is to track the slow ssh connection issue happening in chaos.

The following connection times are from email:

~ $ time ssh chromeos-test@chromeos3-infra-devserver1.cros 'curl "http://chromeos3-infra-devserver1:8082/check_health?"'
chromeos-test@chromeos3-infra-devserver1.cros.corp.google.com's password: 
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0{"disk_total_bytes_per_second": 30277.506458263786, "network_total_bytes_per_second": 1101.8029990849661, "network_sent_bytes_per_second": 387.9784994058031, "apache_client_count": 4, "disk_write_bytes_per_second": 30277.506458263786, "cpu_percent": 0.0, "disk_read_bytes_per_second": 0.0, "network100   412  100   412    0     0   2970      0 --:--:-- --:--:-- --:--:--  2985ount": 0, "telemetry_test_count": 1}

real    0m2.393s
user    0m0.486s
sys     0m0.186s
~ $ time ssh chromeos-test@chromeos3-infra-devserver2.cros 'curl "http://chromeos3-infra-devserver2:8082/check_health?"'
chromeos-test@chromeos3-infra-devserver2.cros.corp.google.com's password: 
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0{"disk_total_bytes_per_second": 42175.21119470393, "network_total_bytes_per_second": 540.0260042328548, "network_sent_bytes_per_second": 252.71857436146925, "apache_client_count": 4, "disk_write_bytes_per_second": 42175.21119470393, "cpu_percent": 0.0, "disk_read_bytes_per_second": 0.0, "network_r100   411  100   411    0     0   3147      0 --:--:-- --:--:-- --:--:--  3161unt": 0, "telemetry_test_count": 1}

real    0m2.456s
user    0m0.501s
sys     0m0.173s
~ $ time ssh chromeos-test@chromeos3-infra-devserver3.cros 'curl "http://chromeos3-infra-devserver3:8082/check_health?"'
chromeos-test@chromeos3-infra-devserver3.cros.corp.google.com's password: 
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0{"disk_total_bytes_per_second": 10237.04138241678, "network_total_bytes_per_second": 1418.390069665325, "network_sent_bytes_per_second": 515.1511156600944, "apache_client_count": 4, "disk_write_bytes_per_second": 10237.04138241678, "cpu_percent": 100.0, "disk_read_bytes_per_second": 0.0, "network_100   412  100   412    0     0   2629      0 --:--:-- --:--:-- --:--:--  2624ount": 0, "telemetry_test_count": 1}

real    0m2.686s
user    0m0.507s
sys     0m0.156


Is the timing still a concern ?
 

Comment 1 by dshi@chromium.org, May 27 2016

Status: WontFix (was: Untriaged)
I think under 3 seconds is reasonable. With David's fix in /etc/ssh/sshd_config (UseDNS no), these devservers are behaving fine now.
Cool.. Thanks!

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