On Tue, 31 Dec 2002, Linux Rocks ! wrote:
>Redhat... sigh... Ill say it again... Yet another reason to not use redhat.
It's not Redhat's fault. The exact same wording appears in the Swackware
mkswap(8) man page. Redhat (and Slackware, and who knows how many other
distributions) probably just took the author's original man page and
packaged it up without modification.
>On Tuesday 31 December 2002 05:00 pm, Horst wrote:
>: On Tue, 31 Dec 2002, Linux Rocks ! wrote:
>: > cat /proc/cpuinfo should tell you about your CPU.
>: > cat /proc/meminfo should tell you about your memory. (including info
>: > about swap)
>: >
>: > Jamie
>:
>: Sounds more than reasonable (and works :-)
>: - I don't know why I blindly trusted the man pages ( RH 8.0 )-:
>: """
>: MKSWAP(8) Linux Programmer’s Manual MKSWAP(8)
>: ...
>: If you don’t know the page size that your machine uses, you may be
>: able to look it up with "cat /proc/cpuinfo" (or you may not ‐ the
>: contents of this file depend on architecture and kernel version).
>: ...
>:
>: Linux 2.2.4 25 March 1999
>: MKSWAP(8)
>:
>: """
>: > On Tuesday 31 December 2002 12:27 pm, Horst wrote:
>:
>: ...
>:
>: > : Q to all: is the old vs. new swap style issue still relevant these days
>: > : (old style being limited to 128MB usable space) -- I made a 500 MB swap
>: > : partition for my 265MB RAM, and top shows it all as avail. -so I'm
>: > : assuming I config'ed and use the new style ?
>: > : cat /proc/cpuinfo didn't tell me any more either ............. Horst
I don't believe the swap format issue has been of any importance since the
transition from Kernel 2.0 to 2.2. As long as your swap partition was
formatted under a 2.2 or later kernel, it should be in the new format.
(Unless you said "mkswap -v0", but there's no reason to do that, unless
you have some need to make a swap space that's backwards-compatible with
old kernels.)
If you really need to know for sure which kind of swap space you have, type
this (you'll need to be root):
dd if=/dev/hdXX bs=4096 count=1 | strings
where "/dev/hdXX" is your swap partition. If you see "SWAP_SPACE" in the
output, you have an old-style swap partition. "SWAPSPACE2" indicates the
new style. (If you don't see either of the above, try increasing the "bs="
number to higher powers of 2...the power that first reveals the swap
space signature is equal to your page size in bytes.)
- Neil Parker
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