> > You can already have 8Gb of swap space in a box with 1Gb RAM.
> > Say on ia32 you have at most 8 swap partition/files, at most 2Gb each,
> > that's 16Gb, right?
>
> oops, right. The swap offset (the pfn of the swap-page) was encoded
> as-is into the pte's higher 24 bits even in 2.2, this gives a limit of
> 64GB swapspace on 32-bit platforms with 32-bit ptes. PAE mode raises
> this limit to 16TB, as there are 32 bits worth of pfn encoded in the
> upper 56 bits of the 64-bit pte.
That makes some sense, thanks.
How does the swap cache fit into this picture? Is that obsolete
(or absent) under 2.3 now?
Matthew.
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