![]() | |||||||||||||
Messages in this thread |
On Wed, 10 Apr 2002, Holzrichter, Bruce wrote: > I thought that this was interesting as well, and had a couple of questions, > as I am no expert in this stuff. > > You don't have the frame buffer enabled for display when trying to use this > as system memory, correct? Correct. :) In fact, text mode can only take a maximum of the first 256KB of memory of the card (extended text paging). So as long as you only target the rest of the memory (and don't use X or svgalib) you should be fine. > Are there implications of the BIOS shadowing video memory to system memory, > or is that not an issue once Linux takes over memory control? Not that I'm aware of. This is PCI-mapped prefetchable memory. > That is a neat idea, though. The PCI/AGP bus may be a limiting factor for > this as well, correct? As far as speed, I believe most video cards have > fast memory, vram, or sram, but it's only useful transferring between the > Video GPU, and Video cards memory, as the bus to the video card is the > bottleneck. Yeah. In fact in some responses the 'slow speed' consideration was so much that they all say I'd be better off writing a block driver and making use of the memory more as a swap device rather than as system RAM. Has anyone out there done this yet? I figure I'd ask before reinventing anything.. :) -Byron -- Byron Stanoszek Ph: (330) 644-3059 Systems Programmer Fax: (330) 644-8110 Commercial Timesharing Inc. Email: byron@comtime.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
| Last update: 2005-03-22 13:22 [from the cache] ©2003-2008 | |||||||||||||