VSync and triple buffering!

[dutton98 0]

Hi all, 

 

So after a few weeks i was finally able to get my P3D where i wanted it to be, no blurries and good fps. Originally i had Vsync and triple buffering set to off, but i find in the cruise when the fps gets very high its almost so smooth its not smooth if you get me. After doing a few flights with Vsync and triple buffering on i have seen that these 2 settings seems to make my sim stutter more and also gives me some of those blurries i didnt want back. 

 

Is someone able to tell me why this happens?

[gboz 157]

 

 

but i find in the cruise when the fps gets very high its almost so smooth its not smooth if you get me.

 

Actually no. ??

 

Are you Vsyncing to 60 or 30 FPS?

 

gb.

[dutton98 0]

I have 60 fps locked in Nvidea inspector 

 

But i find its odd, cause when i have vsync and triple buffering on i seem to get more stutters and also blurries. 

 

But when vsync is off and triple buffering is off, i seem to get really good crisp textures, no stutters but on like final approach the fps gets quite bad, like when vsync is on its so much smoother. 

 

I would love to be able to have both 

What im trying to say about the smooth but no smooth, when im in the cruize the fps must get so high, that when i pan around its smooth but its almost like when i pan it stops for a millisecond and stutters almost 

[SteveW 1,792]

Try this Harry,

 

Set the 30fps limit in NI.

 

Display Settings set Unlimited, VSync On, and Triple Buf On.

Look at the shift-z fps you should see it around 30.

 

or

 

Set the 30fps limit in NI.

Display Settings set 30fps fixed on the slider, set VSync Off and Triple Buf Off.

 

Also I recommend setting HT On and affinity with four LPs one per core.

[TheFlightSimGuy 514]

With my new system I use Triple Buffering with V-Sync off and I am getting incredible frame rates. I guess it works differently for each person. 

[SteveW 1,792]

With my new system I use Triple Buffering with V-Sync off and I am getting incredible frame rates. I guess it works differently for each person.

Yes that's true, vsync off gives the most fps. But I'm sure it's the same for everyone.

 

Anyway, he's not got an issue with fps.

[dutton98 0]

What does triple buffering even do?

 

And why would i be getting blurries when vsync and triple buffering is turned on

 

Bizzare

[SteveW 1,792]

Well, the triple buffer refers to the three screen memory storage areas the GPU uses for frames being made and displayed. There is a front buffer that is currently being fed to the screen, then there are two backbuffer frames. Any one of the backbuffer frames is being drawn by the sim, the other is ready to be switched with the front buffer. So with triple buffer there's never any waiting to switch the front buffer with a completed buffer frame, since there's always one of the two available, while the other can be drawn. So the CPU and GPU go full steam ahead. So can introduce blurries as it leaves too little time for the background tasks to populate the tiles.

 

With the VSync, that synchronises the GPU display with the output device feeding the screen, not to be confused with the vsync of a raster monitor. If the GPU hasn't finished a frame and the buffer run out, due perhaps to too much detail, then it waits on that frame. Without VSync, displays the same frame until the new one can be switched in.

 

So that's why I suggested to try those two methods running at 30, instead of 60 fps.

[dutton98 0]

Thanks Steve, will give it ago. 

[dutton98 0]

With my new system I use Triple Buffering with V-Sync off and I am getting incredible frame rates. I guess it works differently for each person. 

do you have triple buffering turned on in nvidea inspector / control panel?

[racklefratz 4]

deleted

[MarkW 1,490]

Well, the triple buffer refers to the three screen memory storage areas the GPU uses for frames being made and displayed. There is a front buffer that is currently being fed to the screen, then there are two backbuffer frames. Any one of the backbuffer frames is being drawn by the sim, the other is ready to be switched with the front buffer. So with triple buffer there's never any waiting to switch the front buffer with a completed buffer frame, since there's always one of the two available, while the other can be drawn. So the CPU and GPU go full steam ahead. So can introduce blurries as it leaves too little time for the background tasks to populate the tiles.

 

With the VSync, that synchronises the GPU display with the output device feeding the screen, not to be confused with the vsync of a raster monitor. If the GPU hasn't finished a frame and the buffer run out, due perhaps to too much detail, then it waits on that frame. Without VSync, displays the same frame until the new one can be switched in.

 

So that's why I suggested to try those two methods running at 30, instead of 60 fps.

 

Interesting information.  So in order to test should we be flying in an area with heavy hit on frames and then what should we be looking for when following your two methods and comparing to unlimited in P3D and no limit in NI ?

[SteveW 1,792]

Testing should be done with little or no AA.

 

Setting the NI limit of 30fps and P3D Display Settings to Unlimited fps + VSync=On + Triple Buffer=On is far less demanding than setting the Fixed fps slider to 30.

[jafferhussain11 34]

Try this Harry,

 

Set the 30fps limit in NI.

 

Display Settings set Unlimited, VSync On, and Triple Buf On.

Look at the shift-z fps you should see it around 30.

 

or

 

Set the 30fps limit in NI.

Display Settings set 30fps fixed on the slider, set VSync Off and Triple Buf Off.

 

Also I recommend setting HT On and affinity with four LPs one per core.

 

prior to applying this setting (30fps limit in ni and vsync on , unlim frames etc..) my core 0 was being taxed fully and the cpu usage overall was 55 to 60 ish and p3d was microstuttering et all.

 

Now the cpu usage is down to 35 to 40 and core zero is 50% utilized and p3d runs absolutely smooth !

 

thank you steve ! Also could you please explain how this could have happened ; the cpu usage reduction i mean ...

 

kind regards,

 

jaff

[GSalden 4,655]

Steve, why the option NVI at 30 and also 30 locked in P3D ?