[Opensim-dev] Fancy a smoothie (ish)?

[R. Gunther]

Justin, are the new ini lines working with OSgrid OpenSimulator 
0.7.2.dev.8caf3ed - [zip] [27.4mb] 09-24-2011 
<http://osgrid.googlecode.com/files/osgrid.opensim-09242011.v0.7.2.8caf3ed.zip> 
?



On 2011-10-14 01:37, Justin Clark-Casey wrote:
> Hi folks.  I've had reason recently to investigate why flying across a 
> region can feel quite jerky.
>
> It seems that one solution is to increase the number of 
> ImprovedTerseObjectUpdate packets that OpenSim sends out when the 
> avatar is moved.  I'm assuming that more packets means smaller and 
> more frequent corrections of avatar position extrapolation by the viewer.
>
> At the moment, we only send out 11 ish packets per second.  Increasing 
> this to 22 makes avatar flying much smoother subjectively.
>
> You can do this via a new set of config parameters added to the bottom 
> of the [Startup] config section of OpenSimDefaults.ini on commit 4e7d433.
>
> In OpenSimDefaults.ini you can see the lines (minus comments)
>
>     MinFrameTime = 0.089
>     UpdateObjectsEveryNFrames = 1;
>     UpdateAgentsEveryNFrames = 1;
>     UpdateEntityMovementEveryNFrames = 1;
>     UpdateCoarseLocationsEveryNFrames = 50;
>     UpdatePhysicsEveryNFrames = 1;
>     UpdateTempCleaningEveryNFrames = 1000;
>     UpdateEventsEveryNFrames = 1;
>     UpdateTerrainEveryNFrames = 50;
>     UpdateStorageEveryNFrames = 200;
>
> At the moment we need to halve MinFrameTime and double all the Update* 
> params except UpdateAgentsEveryNFrames.  You can do this by overriding 
> the defaults with the following parameters at the bottom of the 
> [Startup] section of OpenSim.ini.
>
>     MinFrameTime = 0.0445
>     UpdateObjectsEveryNFrames = 2;
>     UpdateAgentsEveryNFrames = 1;
>     UpdateEntityMovementEveryNFrames = 2;
>     UpdateCoarseLocationsEveryNFrames = 100;
>     UpdatePhysicsEveryNFrames = 2;
>     UpdateTempCleaningEveryNFrames = 2000;
>     UpdateEventsEveryNFrames = 2;
>     UpdateTerrainEveryNFrames = 100;
>     UpdateStorageEveryNFrames = 400;
>
> My subjective experience is that horizontal avatar flying feels much 
> smoother on my local standalone and on a remote system.  However, this 
> is only the case once everything has finished loading and if you 
> aren't being spammed by spurious ObjectUpdates from prims, as 
> discussed very recently in this list.  You can prevent spamming by 
> making sure your client bandwidth is suitable for your connection 
> quality or by setting enable_adaptive_throttles = true in 
> [ClientStack.LindenUDP].
>
> I've no idea how this will perform on a more heavily loaded sim, 
> particularly as we're currently achieving this change by halving the 
> time that physics has to update and avatar location is updating twice 
> for every physics update.  But if you try this I'd be interested in 
> any feedback.
>
> Also, please feel free to tweak the settings in other ways but we 
> cannot provide any support.
>

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