low breezy hard disk performances

[The Saltydog]

Before upgrading to breezy I have saved my disk timings from running
sudo hdparm -tT /dev/hda

This was the timing on Hoary:

/dev/hda:
Timing cached reads: 2980 MB in 2.00 seconds = 1488.74 MB/sec
Timing buffered disk reads: 174 MB in 3.03 seconds = 57.49 MB/sec

and this is the current timing in Breezy:

/dev/hda:
Timing cached reads: 2832 MB in 2.00 seconds = 1415.51 MB/sec
Timing buffered disk reads: 40 MB in 3.01 seconds = 13.29 MB/sec


disk info:

/dev/hda:
 Model=Maxtor 6E040L0, FwRev=NAR61590, SerialNo=E1B04FFE
 Config={ Fixed }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=78165360
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: (null):

and CPU info:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 2.60GHz
stepping        : 9
cpu MHz         : 2594.690
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
xtpr
bogomips        : 5144.57