Gentoo Forums
Gentoo Forums
Gentoo Forums
Quick Search: in
graphics card video memory [solved]
View unanswered posts
View posts from last 24 hours

 
Reply to topic    Gentoo Forums Forum Index Kernel & Hardware
View previous topic :: View next topic  
Author Message
while true
Guru
Guru


Joined: 07 Apr 2010
Posts: 483
Location: Ljubljana, Slovenia

PostPosted: Wed Oct 07, 2015 8:43 pm    Post subject: graphics card video memory [solved] Reply with quote

Hello guys,

So i got myself a better graphics card, SAPPHIRE R5 230 2GB DDR3.
I saw 2GB and i thought that should be video memory,
compared to 256M that I had it is sugnifficien leap.

I changed kernel, reinstalled xord-servet, ati-video-dirver, radeon, reboot and it seems to work.

but:
Code:
keeshta xorg.conf.d # lspci -v -s 01:00.0
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] (prog-if 00 [VGA controller])
        Subsystem: PC Partner Limited / Sapphire Technology Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
        Flags: bus master, fast devsel, latency 0, IRQ 27
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at fea20000 (64-bit, non-prefetchable) [size=128K]
        I/O ports at e000 [size=256]
        Expansion ROM at fea00000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
        Capabilities: [150] Advanced Error Reporting
        Kernel driver in use: radeon
       
keeshta xorg.conf.d # glxinfo | grep rendering
direct rendering: Yes

My new video memory is still 256M with 128 somehow disabled, where are those 2GB?

here are some product links, and technical info (all links to same video card I have):
http://www.enaa.com/oddelki/racunalnistvo/izd_206_ac92130578_sapphire_r5_230_2gb_ddr3_silent#izdelekOpis
http://www.bestbuy.com/site/xfx-core-edition-radeon-r5-230-2gb-ddr3-pci-express-graphics-card/2515008.p?id=1219073745855&skuId=2515008
https://www.theitdepot.com/details.php?prod=Sapphire+Radeon+R5+230+2GB+DDR3+ATI+PCI+E+Graphic+Card&prodid=23849
http://www.ebuyer.com/641531-sapphire-r5-230-2gb-ddr3-vga-dvi-hdmi-pci-e-graphics-card-11233-02-20g

Specification says 2GM video memory, or am I missing something, being noob?

Thank you
_________________
Kind regards, Goran Mitic

alive
while true
kick ass


Last edited by while true on Wed Oct 07, 2015 11:48 pm; edited 1 time in total
Back to top
View user's profile Send private message
NeddySeagoon
Administrator
Administrator


Joined: 05 Jul 2003
Posts: 44178
Location: 56N 3W

PostPosted: Wed Oct 07, 2015 9:45 pm    Post subject: Reply with quote

while true,

You have 2G of Video RAM but it does not work the way you think it does.

The 2G is divided up into pages. Only one page is mapped into the CPU memory space at a time.
Your 2G could be 8 * 256Mb pages. Its not quite that simple either.
This mapping is only used for loading 3D textures into the graphics card. When you are not doing 3D, most of the Video RAM is not used. You may need as much as 64Mb for 2D.

Some further Video RAM may be used for off screen storage of on screen objects, so that they can be copied into the on screen location as required.
Copy operations are much faster than drawing.

The graphics chip gets a series of instructions about what to draw and where to draw it.
Like draw rectangle, fill rectangle. Eventually, something somewhere has to plot every pixel but its not the CPU, unless you use the VGA graphics driver, so the Video RAM does not need to be mapped into the CPU memory space. At least, not much of it.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
Back to top
View user's profile Send private message
while true
Guru
Guru


Joined: 07 Apr 2010
Posts: 483
Location: Ljubljana, Slovenia

PostPosted: Wed Oct 07, 2015 11:47 pm    Post subject: Reply with quote

Hey NeddySeagoon, hello!


aha, so lots of stored stuff, ready for use.

well, so much for my new video card...


NeddySeagoon, thank you again for taking the time and explaining
_________________
Kind regards, Goran Mitic

alive
while true
kick ass
Back to top
View user's profile Send private message
Display posts from previous:   
Reply to topic    Gentoo Forums Forum Index Kernel & Hardware All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum