FreeBSD problem with Apache 2.0.48 and php4.3.4

[rtsit]

On a FreeBSD box, with 256 meg RAM, and a 1.7 Gig
processor, we have about 300 virtualdomain sites
running on..

Apache 2.0.48 and php4.34

I know memory is a bit low, but we're not really
hitting swap yet.  Load avg is 0.10, 0.19, 0.22

Web directories mounted by NFS share...

The problem we're having is that everything works
great. PHP pages get server-parsed by Apache, etc.

Out of every 30 or 40 page loads, all of a sudden some
PHP code is no longer webserver parsed and gets dumped
to STDOUT.  (using IE6, you can go to VIEW/SOURCE and
see raw php code).

Simplying hitting reload/refresh works, and then
everything magically goes back to normal again, until
another few minutes where raw php code gets dumped
again.

Since this is going to freebsd-isp I figured someone
may have seen this type of behavior before.

Maybe this helps?

ipcs -a ; sysctl vm.zone
Message Queues:
T     ID     KEY        MODE       OWNER    GROUP 
CREATOR   CGROUP CBYTES  QNUM QBYTES LSPID LRPID  
STIME    RTIME    CTIME

Shared Memory:
T     ID     KEY        MODE       OWNER    GROUP 
CREATOR   CGROUP NATTCH  SEGSZ  CPID  LPID   ATIME   
DTIME    CTIME

Semaphores:
T     ID     KEY        MODE       OWNER    GROUP 
CREATOR   CGROUP NSEMS   OTIME    CTIME

vm.zone: 
ITEM            SIZE     LIMIT    USED    FREE 
REQUESTS

PIPE:            160,        0,     27,    993, 
1057864
SWAPMETA:        160,    30878,    274,   1825,    
4868
unpcb:           160,        0,     18,    132,   
16258
ripcb:           192,     3944,      0,     42,      
43
syncache:        160,    15359,      0,     76,  
427479
tcpcb:           576,     3944,    256,    177,  
499562
udpcb:           192,     3944,      3,     39,  
111791
socket:          192,     3944,    277,    192,  
627655
KNOTE:            64,        0,      0,    128,   
76899
DIRHASH:        1024,        0,     54,    482,    
9235
NFSNODE:         352,        0,  15800,    194, 
2269784
NFSMOUNT:        544,        0,      1,      6,       
1
VNODE:           192,        0,  16420,    116,   
16420
NAMEI:          1024,        0,      0,     40,
63394549
VMSPACE:         192,        0,     89,    935,  
500459
PROC:            416,        0,     95,    885,  
500465
DP fakepg:        64,        0,      0,      0,       
0
PV ENTRY:         28,   521326,  66180, 347052,
2435482414
MAP ENTRY:        48,        0,   8807,  11551,
38930495
KMAP ENTRY:       48,    15735,   2082,   1032, 
1090110
MAP:             108,        0,      7,      3,       
7
VM OBJECT:        92,        0,  17981,   3879, 13734418

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