Here is the log of booting without "mem=64M".
e820: 0009f800 @ 00000000 (usable)
e820: 00000800 @ 0009f800 (reserved)
e820: 00010000 @ 000f0000 (reserved)
e820: 03f00000 @ 00100000 (usable)
e820: 00010000 @ fec00000 (reserved)
e820: 00010000 @ fee00000 (reserved)
e820: 00080000 @ fff80000 (reserved)
e820: 00000000 @ 00000000 (usable)
Warning only 896MB will be used.
Use a HIGHMEM enabled kernel.
Scan SMP from c0000000 for 1024 bytes.
Scan SMP from c009fc00 for 1024 bytes.
Scan SMP from c00f0000 for 65536 bytes.
found SMP MP-table at 01003504
Intel MultiProcessor Specification v1.4
Virtual Wire compatibility mode.
OEM ID: COMPAQ Product ID: PROLIANT APIC at: 0xFEE00000
Processor #1 Pentium(tm) Pro APIC version 16
Floating point unit present.
Machine Exception supported.
64 bit compare & exchange supported.
Internal APIC present.
Bootup CPU
Processor #0 Pentium(tm) Pro APIC version 16
Floating point unit present.
Machine Exception supported.
64 bit compare & exchange supported.
Internal APIC present.
Bus #0 is PCI
Bus #1 is PCI
Bus #9 is ISA
I/O APIC #8 Version 17 at 0xFEC00000.
Processors: 2
mapped APIC to ffffe000 (fee00000)
mapped IOAPIC to ffffd000 (fec00000)
totalpages: 00038000
zone(0): 4096 pages.
zone(1): 225280 pages.
zone(2): 0 pages.
Detected 399076263 Hz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 398.13 BogoMIPS
Memory: 45168k/917504k available (1711k kernel code, 19980k reserved, 505k
data, 200k init, 0k highmem)
Buffer-cache hash table entries: 65536 (order: 6, 262144 bytes)
Page-cache hash table entries: 262144 (order: 8, 1048576 bytes)
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