Bug #238

Timestamp inconsistency

Added by Guillaume Jourjon about 2 years ago. Updated 26 days ago.

Status:Assigned Start date:21/01/2010
Priority:High Due date:
Assignee:Guillaume Jourjon % Done:

50%
Category:client+server
Target version:2.7.0

Description

There seems to be a problem with the oml client timestamps. Indeed, running an experiment, we found that at some point if we stress test the server, the oml_ts_client field contains some gaps of several seconds, and then in less than one millisecond almost 50 measurements are performed.

AverageWindowThroughput.png (5 kB) Guillaume Jourjon, 05/03/2010 03:26 pm

History

#1
Updated by Jolyon White almost 2 years ago

Guillaume, this might be fixed now that the oml2-server uses SQL transactions. Could I ask you to re-run your test to see if it still causes these gaps in the timestamps? The transactions code is in the master branch, but not in release/2.3.

#2
Updated by Guillaume Jourjon almost 2 years ago

With the new use of SQL transactions it seems that this bug disappears but we need more testing on the subject.

I put as attachment the result graph of TCP on a LAN 100Mbits. Basically in this case we are injecting in the database 2 measurement per packet of data + 2 measurements per ack.
p=.!AverageWindowThroughput.png!

#3
Updated by Guillaume Jourjon almost 2 years ago

  • % Done changed from 0 to 50

#4
Updated by Jolyon White over 1 year ago

  • Category set to client+server
  • Status changed from New to Assigned
  • Assignee set to Jolyon White
  • Priority changed from Normal to High
  • Target version set to 2.5.0

#5
Updated by Jolyon White over 1 year ago

  • Target version changed from 2.5.0 to 2.6.0

#6
Updated by Thierry Rakotoarivelo 4 months ago

  • Assignee deleted (Jolyon White)
  • Target version changed from 2.6.0 to 2.7.0

#7
Updated by Olivier Mehani 3 months ago

Guillaume, could we double-check formally on this one, so we know if it is still a problem, or if it has been fixed.

#8
Updated by Thierry Rakotoarivelo 26 days ago

  • Assignee set to Guillaume Jourjon

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