Swap on video ram
Warning: the stuff in here is not tested that much, and it is possible that you will run out of video ram/have a conflict and your xserver will crash. To be absolutely sure of stability, you can use the vga xorg driver, where you can set a specific amount of videoram, (unlike other foss or binary drivers, which seem to ignore attempts to set videoram = 16 or whatever).
The fast memory on your graphics card (if you have one) can be used as general ram (actually swap) by using the MTD subsystem of the kernel. MTD is now included in kernel26.
Get a kernel version >= 18.104.22.168-6
When you are running a kernel with MTD modules, you have to load the modules specifying the pci address ranges that correspond to the ram on your video card.
check the ranges with
you then look for the sections that name your video card as an example mine is here:
01:00.0 VGA compatible controller: ATI Technologies Inc RV350 AR [Radeon 9600] (prog-if 00 [VGA]) ubsystem: PC Partner Limited Unknown device 0830 ntrol: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- tatus: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- ency: 64 (2000ns min), Cache Line Size: 32 byteserrupt: pin A routed to IRQ 11 egion 0: Memory at e0000000 (32-bit, prefetchable) [size=256M] egion 1: I/O ports at c800 [size=256] egion 2: Memory at ff8f0000 (32-bit, non-prefetchable) [size=64K] ion ROM at ff8c0000 [disabled] [size=128K] ies: <access denied> 01:00.1 Display controller: ATI Technologies Inc RV350 AR [Radeon 9600] (Secondary) ubsystem: PC Partner Limited Unknown device 0831 ntrol: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- tatus: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- ency: 64 (2000ns min), Cache Line Size: 32 bytes egion 0: Memory at d0000000 (32-bit, prefetchable) [size=256M] egion 1: Memory at ff8e0000 (32-bit, non-prefetchable) [size=64K] ies: <access denied>
So what's important is the Region 0, or the biggest one (it seems possible to use the addresses of either the primary or secondary)
The video card needs some ram to function as a video card, and this space you leave at the start of the address range. Choose how much space you can spare; maybe it is 16MiB which is 0x01000000. or maybe some more.
Your start of the range is then the sum of that offset and the initial address range: I would have added 0x01000000 to 0xe00000000 to get the start
# for using vram as swap modprobe slram map=VRAM,0xSTART RANGE HERE,0xEND modprobe mtdchar #probably unnecessary modprobe mtdblock mkswap /dev/mtdblock0 swapon /dev/mtdblock0 -p 10 #higher priority gets used before disk