Server problem(apache?)

Hello,

I have this strange problem with my server, average bandwith is around 25Mpbs but sometimes it drops in 1 instance to 5Mbps and the site go very slow. And then after some hours without changing anything it goes back to normal, the sites load fast again.
Its a P4 2.8Ghz with 1024MB ram. Its running a big site with 50K+ uniques visitors/day, its a php/mysql site(small queries).

I also mailed the datacenter they say my server is connected via 1Gbps line to coreswitch so the network could not be the problem(they say)
Normally I have 350 processen en server load is around 1, cpu 7%.Example site on the server http://domainshuffle.com/ (maybe fast again when you view it.)
I tried restarting apache,mysql,whole server, cleaning tmp, looking for cron, did not changed anything.
I think its a problem with apache because when I want to view server-status it sometimes will not show(see output below).

I would really appreciate it if someone could help me.
Thx in advance


I will show some output when site are slow (at this moment).

Code: 
top:
top - 20:45:24 up 5 days, 35 min,  2 users,  load average: 0.36, 0.31, 0.33
Tasks: 167 total,   1 running, 137 sleeping,   0 stopped,  29 zombie
Cpu(s):  3.0% us,  4.2% sy,  0.0% ni, 88.5% id,  2.8% wa,  0.0% hi,  1.5% si
Mem:   1034492k total,   996636k used,    37856k free,    21292k buffers
Swap:  2096472k total,    61028k used,  2035444k free,   819480k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
18060 root      25   0 22868  13m 9792 S  2.3  1.3   2:45.60 httpd
 8952 root      16   0  8648 2216 1792 S  0.3  0.2   0:01.22 sshd
15724 root      16   0  3736  992  748 R  0.3  0.1   0:00.01 top
15816 apache    25   0     0    0    0 Z  0.3  0.0   0:00.01 httpd <defunct>
15817 apache    23   0 23028  13m 9956 S  0.3  1.3   0:00.01 httpd
15823 apache    25   0     0    0    0 Z  0.3  0.0   0:00.01 httpd <defunct>
    1 root      16   0  2644  452  420 S  0.0  0.0   0:00.80 init
    2 root      RT   0     0    0    0 S  0.0  0.0   0:00.35 migration/0
    3 root      34  19     0    0    0 S  0.0  0.0   0:00.88 ksoftirqd/0
    4 root      RT   0     0    0    0 S  0.0  0.0   0:00.36 migration/1
    5 root      34  19     0    0    0 S  0.0  0.0   0:01.15 ksoftirqd/1
    6 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 events/0
    7 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 events/1
    8 root       6 -10     0    0    0 S  0.0  0.0   0:00.00 khelper
    9 root      15 -10     0    0    0 S  0.0  0.0   0:00.00 kacpid
   29 root       5 -10     0    0    0 S  0.0  0.0   0:00.00 kblockd/0


free -m
                  total       used       free     shared    buffers     cached
Mem:          1010        986         24          0         20        814
-/+ buffers/cache:        151        859
Swap:         2047         59       1987



Sometimes when I want to view server-status I get this:

Looking up localhost
Making HTTP connection to localhost
Alert!: Unable to connect to remote host.
lynx: Can't access startfile http://localhost/server-status


And sometimes:

 Server uptime: 5 minutes 47 seconds
   Total accesses: 14 - Total Traffic: 411 kB
   CPU Usage: u.34 s.04 cu0 cs0 - .11% CPU load
   .0403 requests/sec - 1212 B/second - 29.4 kB/request


hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   3080 MB in  2.00 seconds = 1538.70 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device
 Timing buffered disk reads:  148 MB in  3.00 seconds =  49.32 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device


httpd.conf: (I have run along time with this config dont think this it the problem)

Timeout 100
KeepAlive On
MaxKeepAliveRequests 150
KeepAliveTimeout 1
MinSpareServers 10
MaxSpareServers 22
StartServers 8
MaxClients 550
MaxRequestsPerChild 400

 

 

 

 

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