I actually get very very well latency in the 2.6.3-rc3
kernel... its the
only 2.6 kernel i have used so far... and on the 2.4.23 kernel that is
patched with low-latency has xrun saying 400+- ms which is crazy...
Have you double-checked your hdparm -v settings (if you're using IDE)?
400ms is pathological for a 2.4.2x kernel with lowlat+preemptible kernel. I
never see more than 2ms on my setups with the Con Kolivas-patched 2.4
kernel, even with HZ=1000 and 64-bit jiffies.
=MB=
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