AMD64 Opteron 250 Errors and APIC Issues with DSFS

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I have ported DSFS to the AMD and IA64 processors. I am currently testing with an AMD64 Opteron 250 2.4 Ghz SMP Processor with DSFS at 250 megabyte per second through from dual 1 GB Intel Adapters. I am seeing excellent application performance but sluggish I/O performance. Using the 2.4.21 kernels with the AMD was disappointing with the system locking up and barfing all over the place. Since I have update to unit to 2.4.6-22, the performance has increased dramatically. This board is employing an 82489DX emulation of the Intel IOAPIC architecture, but it is reporting an abnormally high level of interrupts. The I/O scaling is vastly improved on 2.6.X kernels over 2.4.X, however, the performance is still 15% less overall than with equivalent Xeon and 7501/7505 based chipsets.

I am also seeing this message on the screen from the do_softirq handler:

Your time source seems to be instable or some driver is hogging interrupts. rip __do_softirq+0x04d/0xd0.

Are there any other tuning parms for the AMD64 to increase I/O scaling? I can rewrite the APIC code underneath and redirect the spurious interrupt handler and EOI sequences to eliminate the excessive interrupts, but is there information on better tuning for these
systems using IOAPIC emulation?

Jeff

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