* Matt Dillon <[EMAIL PROTECTED]> [010321 10:20] wrote:
>
> :B) Added 3gb of swap on one drive, 1gb of swap on a raid volume
> : another 1gb swap on another raid volume
> :C) enabled vfs.vmiodirenable and kern.ipc.shm_use_phys
> :
> :--
> :+-----------------------------------------------------------+
> :| [EMAIL PROTECTED] | [EMAIL PROTECTED] |
>
> I'd reduce that 3gb on that one drive to 1gb. The kernel
> allocates a bitmap for 4 * (largest_swap_partition), i.e.
> it will allocate a bitmap for 3gb x 4 = 12 gb worth of swap,
> even though you only have 5. If you reduce the 3gb to 1gb, then
> the kernel will allocate a bitmap for 1gb x 4 = 4gb worth of swap,
> using 1/3 the memory for the bitmap. Each page of swap eats 2 bits of
> memory for the bitmap so we aren't talking about a huge
> amount of memory, but it's worth doing.
Hey, talking about large amounts of swap, did you know that:
4.2-STABLE FreeBSD 4.2-STABLE #1: Sat Feb 10 01:26:41 PST 2001
has a max swap limit that's possibly 'low':
b: 15912412 0 swap # (Cyl. 0 - 990*)
c: 17912412 0 unused 0 0 # (Cyl. 0 - 1114*)
If I made b == c, then i couldn't swapon it.
Don't ask why I have that much swap, I just needed a bunch on a dedicated
disk. :)
--
-Alfred Perlstein - [[EMAIL PROTECTED]|[EMAIL PROTECTED]]
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