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Heads up: ubc_direct enabled by default

To: current-users%netbsd.org@localhost
Subject: Heads up: ubc_direct enabled by default
From: Andrew Doran <ad%netbsd.org@localhost>
Date: Thu, 23 Apr 2020 22:10:56 +0000

Hi,

This affects amd64, alpha and aarch64, but only 1 and 2 CPU systems so far. 
Any more and it's still off by default.  Only the default has changed so the
sysctl (vm.ubc_direct) still works for turning it on and off manually.

This works great for me on amd64 but needs some tweaks to handle many CPUs.
I have some ideas on that one and hopefully will have something to try soon.

Cheers,
Andrew

Follow-Ups:
- Re: Heads up: ubc_direct enabled by default
  - From: Patrick Welche

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