2.4 vs 2.6 USB mass storage device performance

Hi,
  We are evaluating performance of USB on both 2.4.25
and 2.6.18.2 kernels on an EHCI mass storage device
with a Seagat SCSI device on a Conexant's ARM11
platform.
  We see significant performace difference w.r.t 2.4
and 2.6 on the same device:

On 2.6:
#sg_dd /dev/sda dio=1 bs=1M count=100 flag=direct
time=1
  reports 12MBps
while on 2.4
#sg_dd /dev/sda dio=1 bs=1M count=100 flag=direct
time=1
  reports just 5.1MBps

  I understand that 2.6 is more capable, but does 2.4
has any limitations? Are there any patches available
to improve the performance in 2.4?

Thanks
Syed



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