On Sat, 15 May 2010 08:19:03 +0000 Tzafrir Cohen <tzaf...@cohens.org.il> wrote:
> On Fri, May 14, 2010 at 10:59:37PM +0300, mi...@post.tau.ac.il wrote: > > > I do still have quite a few qualms with it though on other regards. I'm deep > > into GPU computing at the moment (Cuda) and what Windows vista and 7 did to > > the > > graphics driver model is a classic example of Microsoft's approach for world > > domination. The operating system is actually managing a virtual memory on > > the > > graphics card behind the graphics driver back. > > > > although designed to assure the DWM can always have enough memory, this > > causes > > a bunch of unexpected and uncontrolled performance and feature issues. > > What does that mean? Latest Linux version also manage the card's virtual > memory. > No it doesn't. Driver manages the video card memory. On a 4GB card you can make a single 4gb allocation and when the memory runs out it runs out, allocation fails. No memory goes in and out of the card without explicitly asking the driver to do so. With Windows 7 the video driver does not see the video card memory. Windows implements a swap on the video card and swaps video memory in and out to system memory behind your back. You can over commit the card. Maximum allocation is ~1gb even when the card has 4gb, if you use too much memory performance drops suddenly. General graphic performance can be half that of Windows XP in some situations and when swapping performance can drop to under 10% of the full performance. _______________________________________________ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
