Messages in this thread | | | Date | Wed, 07 Apr 2004 16:21:44 -0700 | From | "Martin J. Bligh" <> | Subject | Re: -mmX 4G patches feedback [numbers: how much performance impact] |
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> I agree as well it solves a real problem (i.e. 4G userspace), though the > userbase that needs it is extremely limited and they're sure ok to run > slower than to change their application to use shmfs (a special 4:4 > kernel may be ok, just like a special 2.5:1.5 may be ok, just like > 3.5:0.5 was ok for similar reasons too), but the mass market doesn't > need 4:4 and it will never need it, so it's bad to have the masses pay > for this relevant worthless runtime overhead in various common > workloads.
Yeah, it needs to be a separate kernel for huge blobby machines. I think that's exactly what RH does, IIRC (> 16GB ?)
> Of course above I'm talking about 2.6-aa or 2.6-mjb. Clearly with > kernels including rmap like 2.6 mainline or 2.6-mm or 2.6-mc or the > 2.4-rmap patches you need 4:4 everywhere, even on a 4/8G box to avoid > running out of normal zone in some fairly common and important workload.
Speaking of which, pte_highmem is stinking expensive itself. There's probably a large class of workloads that'd work with out pte_highmem if we had 4/4 split (or shared pagetables. Grrr ;-))
M.
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