I am using Gentoo on a HP DL380 G3. Intel Xeon (P4) 3.06ghz processors,
with a HP COMPAQ CCISS ARRAY in RAID 0 mode (hardware, linux just sees one single drive)

hdparm on 2.6.27 shows the speed at ~ 130mbs

After performing an upgrade of the kernel

hdparm on 2.6.29 shows the speed at ~ 30mbs (30-50mbs varies)

I looked at the DMESG comparisons,
and the only difference is that 2.6.29 mentions:
"IRQF_DISABLED is not guaranteed on shared IRQs"

Now I have looked for hours to see if it was a configuration issue, but to no avail.

Anyone ?