On sparc64 you should set the burst settings to 64-byte read/write
bursts because the PCI chipset is going to disconnect you on 64-byte
boundaries anyways. If the chip is bursting more than this, you
are wasting lots of PCI cycles with the retries done after the
disconnect.
Also make sure to use PCI READ MULTIPLE commands for DMA if the chip
provides such an option, this helps performance on many PCI
controllers to no end.
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