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LVM copy rather slow

I installed lvm on my new machine which is IBM thinkpad R40. DMA is set
up, as from hdparm /dev/hda the output is :

multcount    = 16 (on)
IO_support   =  0 (default 16-bit)
unmaskirq    =  0 (off)
using_dma    =  1 (on)
keepsettings =  0 (off)
readonly     =  0 (off)
readahead    =  8 (on)
geometry     = 5168/240/63, sectors = 78140160, start = 0

but when I copy a large file which is about 700m from one place to
another, it costs me 120s, I don't know what's wrong with the dma. 
Any ideas?
Zeng Nan

Simple is Beautiful.

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