memory warnings r240891 | dmesgg

Hello,

Swap was created twice on this 9.0 release candidate install- once as
part of zfs and also as encrypted hard drive space.

(30) _at_ 12:01:50> swapinfo
Device          1K-blocks     Used    Avail Capacity
/dev/zvol/bigD/swap   4194304        0  4194304     0%
/dev/gpt/swap0.eli   3145728        0  3145728     0%
/dev/gpt/swap1.eli   3145728        0  3145728     0%
Total            10485760        0 10485760     0%

Since then, all references to OpenBSD Packet Filter have been removed
and the system is now  r240891

*************************************************************
FreeBSD 10.0-CURRENT #1 r240891: Tue Sep 25 00:51:03 EDT 2012

WARNING: WITNESS option enabled, expect reduced performance.

CPU: AMD Sempron(tm) Processor 2800+ (1599.86-MHz K8-class CPU)
   Origin = "AuthenticAMD"  Id = 0x20fc2  Family = 0xf  Model = 0x2c
Stepping =
2

Features=0x78bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CM
OV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2>
   Features2=0x1<SSE3>
   AMD Features=0xe2500800<SYSCALL,NX,MMX+,FFXSR,LM,3DNow!+,3DNow!>
   AMD Features2=0x1<LAHF>
real memory  = 1073741824 (1024 MB)
avail memory = 937144320 (893 MB

ZFS NOTICE: Prefetch is disabled by default if less than 4GB of RAM is
present;
             to enable, add "vfs.zfs.prefetch_disable=0" to
/boot/loader.conf.
ZFS filesystem version: 5
ZFS storage pool version: features support (5000)

ipfw2 (+ipv6) initialized, divert loadable, nat loadable, rule-based
forwarding disabled, default to deny, logging disabled
DUMMYNET 0 with IPv6 initialized (100409)
load_dn_sched dn_sched FIFO loaded
load_dn_sched dn_sched PRIO loaded
load_dn_sched dn_sched QFQ loaded
load_dn_sched dn_sched RR loaded
load_dn_sched dn_sched WF2Q+ loaded
hpt27xx: no controller detected.

GEOM_ELI: Device gpt/swap0.eli created.
GEOM_ELI: Encryption: AES-XTS 128
GEOM_ELI:     Crypto: software
GEOM_ELI: Device gpt/swap1.eli created.
GEOM_ELI: Encryption: AES-XTS 128
GEOM_ELI:     Crypto: software

warning: total configured swap (2621440 pages) exceeds maximum
recommended amount (1852656 pages).

warning: increase kern.maxswzone or reduce amount of swap.

*************************************************************

Apparently kern.maxswzone is currently equal to 0.  How might I tweak it
just enough to fix this?

Also, I have been disregarding the prefetch notice about zfs.  I have
not seen any adverse results.

Darrel