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开源 ATI radeon 支持的最大 VRAM

tag-icon • tag-icon 11.10 radeon hybrid-graphics
开源 ATI radeon 支持的最大 VRAM

我有一台 ATI HD6370，配备 1G 内存，运行在 Ubuntu 11.10 上。以下是 dmesg 的输出

sourajit@sourajit:/etc/X11$ sudo dmesg | grep drm
[    5.149765] [drm] Initialized drm 1.1.0 20060810
[    5.606144] [drm] radeon defaulting to kernel modesetting.
[    5.606147] [drm] radeon kernel modesetting enabled.
[    5.606436] [drm] initializing kernel modesetting (CEDAR 0x1002:0x68E4 0x17AA:0x397A).
[    5.606630] [drm] register mmio base: 0xE0600000
[    5.606631] [drm] register mmio size: 131072
[    6.475815] [drm] Detected VRAM RAM=1024M, BAR=256M
[    6.475819] [drm] RAM width 64bits DDR
[    6.475890] [drm] radeon: 1024M of VRAM memory ready
[    6.475891] [drm] radeon: 512M of GTT memory ready.

但是，这是安装后 lspci 的输出。这意味着什么？radeon 实际使用了多少内存？

01:00.0 VGA compatible controller: ATI Technologies Inc Robson CE [AMD Radeon HD 6300 Series] (prog-if 00 [VGA controller])
    Subsystem: Lenovo Device 397a
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0, Cache Line Size: 64 bytes
    Interrupt: pin A routed to IRQ 42
    **Region 0: Memory at c0000000 (64-bit, prefetchable) [size=256M]
    Region 2: Memory at e0600000 (64-bit, non-prefetchable) [size=128K]**
    Region 4: I/O ports at 3000 [size=256]
    Expansion ROM at e0620000 [disabled] [size=128K]

答案1

它使用 1024M。256M 只是 CPU 可以直接寻址的限制。其余的 RAM 可供 GPU 使用，CPU 不需要直接接触它。

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