PMC domain question

["Lin, Allen" <ALin@xxxxxxxxxxxxxxxxxxx>]

I applied the patch profile-0.12.2-2.4.19.patch.gz to linux-2.4.19.  I can run 
kernprof (1.5) for the time domain.  But, when I tried to use the PMC domain
such as 

        kernprof -b -d pmc -a 0x79 -f 800 -t acg

I got something like:

Flat profile:
 
Each sample counts as -0.00125 events (0x3007.
  %   cumulative   self              self     total
 time events (0  events (    calls  ae/call  ae/call  name
 25.14    -58.85   -58.85                             cg_record_arc
 14.68    -93.22   -34.37                             csum_partial_copy_generic
 14.19   -126.43   -33.21   307915 -107858499910689.64 -107858499910689.64  
boomerang_start_xmit
  6.72   -142.15   -15.72    77531 -202789851801215.00 -250173066481476.41  
boomerang_interrupt
  5.12   -154.13   -11.98                             USER
  3.85   -163.14    -9.02    85177 -105838430562240.98 -347696058204885.88  
handle_IRQ_event
  2.65   -169.35    -6.21   129149 -48064638518300.57 -580590560157495.25  
do_softirq
  2.11   -174.30    -4.95                             mcount                    
           

Do they look right?  Why am I getting negative numbers and, if they are okay, 
how do I interpret them?

Here is my CPU info:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 8
model name      : Pentium III (Coppermine)
stepping        : 3
cpu MHz         : 848.055
cache size      : 256 KB   

Thanks,

Allen Lin