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Re-enable write combining, disabled by default at r295486.

Description

Re-enable write combining, disabled by default at r295486.

if_ntb(4) strongly benefits from WC, improving throughput from 350Mbit/s
to 8-10Gbit/s on my tests.

MFC after: 1 week

Details

Provenance
mavAuthored on
Parents
rS300609: sfxge(4): enable Medford support
Branches
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