R9.1 MFD refresh/ redraw delay
Printed From: Avidyne
Category: Entegra Release 9
Forum Name: Release 9 Insiders - Anyone can post
Forum Description: Release 9 Insider Members
URL: http://forums.avidyne.com/forum_posts.asp?TID=102
Printed Date: 28 Apr 2024 at 4:46pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: R9.1 MFD refresh/ redraw delay
Posted By: Harvey
Subject: R9.1 MFD refresh/ redraw delay
Date Posted: 08 Jul 2010 at 7:17pm
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I have experienced and many other pilots on COPA forums have reported a terrible slow down in the MFD refresh rate with R9.1. This gives serious pause. Is this a function of software bloat as experienced by many computer users when program have outgrown their hardware base? Is the memory buffer assigned to map or weather downloads sufficient? Are you trying to incorporate too many "cool" features such that the system stagnates? Is this speed issue related to the distance to altitude designation we just "lost" in R9.1? Is the problem a function of bus speed, or, videocard limitations? How can such a slow system ever handle three dimensional rewrites in SVT? The problem has been hanging there--is Avidyne going to address this potentially serious concern?
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Replies:
Posted By: AviMike
Date Posted: 03 Aug 2010 at 8:58am
The map performance slowdown is from our newest function, Procedure Preview. The Preview turns terrain on and off as the flight plan is being edited. Loading terrain from the compact flash is a bottleneck in Release 9.1. Engineering has been working on it for the last few months, even before R9.1. The demand is much higher when Synthetic Vision is requiring higher resolution terrain at higher update rates. There are a couple of significant improvements that you’ll see in the next releases.
The first improvement is the speed at which data is passed from the Compact Flash to the graphics processing unit (GPU). Due to this improvement the bus is no longer the bottleneck, it becomes the access speed of the compact flash, which is quite fast. This more direct terrain transfer also reduces the CPU workload required to pass data so we gain back CPU power as well.
The second improvement is the speed at which we draw water (oceans and inland water). We changed it from a large number of polygons to being a layer in the terrain. This also frees up the CPU workload and gives more time to other map features than to drawing water. This will be implemented as part of the Synthetic Vision release (i.e. R9.3).
There are some other minor tweaks but the these two improvements will make the map back to what it was prior to R9.1, and hopefully faster. If there is anything that we find our prior to a release that will improve the map speed then I’ll let you know.
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