Memory runs out fast with 2.6.0-test2 (and test1)

[Marino Fernandez <mjferna@yahoo.com>]

Everything works OK in my system... my only gripe is that I run out of memory 
quickly. I have a Fujitsu C-7651 Lifebook laptop, Pentium III, 512 Mb Ram, 
300 Mb swap.

When I start up (with KDE) I've alredy used 300 megs of ram. The if I open 
mozilla, and view some phostos with kuickshow, thats it, I use 700 Megs of 
physical and virtual memory...

Looking at ps aux shows that 5% goes to each of the 5 mozilla processes, 3% 
for this, 2% for that... It is all accounted for in different ways. It is 
just that running under 2.4.21, with the same programs I very rarely use my 
swap memory, let alone use all my physical and swap memory.

PS
I had the same issue with test1.

PPS
Could it be that I am doing something stupid when I configure the kernel... 
This is what I have in my config file.. may be config_nohighmem?:

# Processor type and features
#
CONFIG_X86_PC=y
CONFIG_MPENTIUMIII=y
CONFIG_X86_CMPXCHG=y
CONFIG_X86_XADD=y
CONFIG_X86_L1_CACHE_SHIFT=5
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_UP_APIC=y
CONFIG_X86_UP_IOAPIC=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_TSC=y
CONFIG_X86_MCE=y
CONFIG_MICROCODE=m
CONFIG_X86_MSR=m
CONFIG_X86_CPUID=m
CONFIG_NOHIGHMEM=y
CONFIG_MATH_EMULATION=y
CONFIG_MTRR=y