-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Thanks David for the clear answers.... I'll investigate further. As for the rest of the PC.... running great with extra RAM ~ it's just UT2004 I have discovered to have an issue here.
The 2/2 is what I'm running with at the moment ... seems to be fine. Thanks again, Ralph David Klempner wrote: > * Ralph Slooten <[EMAIL PROTECTED]> [2006-06-19 00:25]: >> David Klempner wrote: >> > Note that without doing *anything*, with a normal 3G/1G split, you'll >>> actually get 896M. Recent kernels added in a config option to have a >>> 2.75G/1.25G split, which solves this problem; it makes sense to use that >>> if you have 1G of RAM. >> This option must be really new because I don't have it. I have two 3/1 >> options, a 2/2 option and a 1/3 option. Either way, I'm now using 2GB. > > It's one of the two "3/1" options; one of them is a PAGE_OFFSET of > 0xC0000000 (3G) and the other is 0xB0000000 (2.75G); the latter is > suggested for someone using 1GB. (I was making that change myself by > hand until they added that option.) > > In fact, the 2G option is slightly lower than 2G, which is why it works > with 2G of RAM. > >> Maybe this is the case, I'm not sure. For testing some other software I >> upgraded to 2.16.6.16 2 weeks ago (when I still had 1GB) which resulted >> in the same problem. I then went back to the previous-compiled 2.6.16.5 >> version which worked flawlessly. It is only now that I have actually >> rebuilt the 2.6.16.5 kernel (due to RAM upgrade) and am having the same >> problem. The NVidial kernel and glx (to be sure) were also rebuilt. >> >> I did a bit of testing last night before I went to bed and it seems that >> no matter what options I use in the kernel I'm getting bad performance >> now from the graphics card. It still gets > 4000 fps with glxgears >> though, so I'm not 100% sure it is the graphics card. >> >> The question I was meaning to ask is what the ideal kernel settings >> should be for 2GB of RAM... from there I'll look for other explanations >> why the 3d isn't performing well. > > Do you have performance problems with any other applications? It > wouldn't surprise me too much if it's some random library issue that > specifically affects that game. > >> Should I use 2/2 *and* highmem, or just 2/2 ? You suggest the highmem >> does very little, but it's there for a valid reason I take it. > > If you're doing 2/2, then don't bother with highmem. Without highmem, > the kernel maps all of physical memory into its address space; this is > naive and fast, but it means that normal processes don't get use of that > space. This isn't a problem for most applications, but there are a few > that expect the extra address space to be available. A direct result of > the 2/2 split is that no single process can, even in theory, (directly) > use more than 2G of RAM, because it can't even *address* more than 2G. > > This would be a more noticeable issue if you had 3G of RAM and did the > 1/3 split; at that point, no process could use more than 1G. I've seen > long running processes (for example, firefox after a month with several > dozen open tabs) use more than that. > > Highmem adds an extra layer of indirection to solve this problem; it's > slightly slower (but, I understand, the cost is minimal) but lets you > have your address space back while still being able to use all of your > RAM. > > My suggestion is to use 3/1 with highmem. If you want, you could also > use 2/2 without highmem; it would probably be just slightly faster, but > could break stuff. Using 2/2 with highmem is (I think) pointless. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (MingW32) iD8DBQFEllAACt0ZF9kLPvYRAja0AJ4gKhWbGw9uQAWVnsqj/ii9xvPm3wCfZVYE N18blB/cTNxITFmcNMEC+Jw= =VBJE -----END PGP SIGNATURE----- -- gentoo-user@gentoo.org mailing list
