PCI latency timer

Seems hard to find some information about how to tune PCI latency timer for maximum performance. So try to dump what I can find.

Here is a detailed introduction about it. This book has some information about it as well.

Linux kernel has a document about tuning Chelsio NIC. Also here about S2IO NIC. Seems these NICs just want to take maximum 248 value and hold bus as long as possible.

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