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Date:      Mon, 19 Jan 2026 22:47:34 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 271826] FreeBSD is disastrously slow on a PowerMac G5, freezing at every command
Message-ID:  <bug-271826-227-VSe7f0cIH7@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-271826-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271826

--- Comment #60 from Adrian Chadd <adrian@freebsd.org> ---
ok, i have acquired a dual-CPU G5 / PPC970

```
---<<BOOT>>---
Copyright (c) 1992-2026 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 16.0-CURRENT #3: Mon Jan 19 20:24:46 UTC 2026
    adrian@freebsd-ppc64-g5:/usr/obj/usr/src/powerpc.powerpc64/sys/GENERIC64
powerpc
FreeBSD clang version 19.1.7 (https://github.com/llvm/llvm-project.git
llvmorg-19.1.7-0-gcd708029e0b2)
WARNING: WITNESS option enabled, expect reduced performance.
VT(ofwfb): resolution 640x480
cpu0: IBM PowerPC 970FX revision 3.1, 2300.49 MHz
cpu0: Features dc000000<PPC32,PPC64,ALTIVEC,FPU,MMU>
cpu0: HID0 511081<NAP,DPM,NHR,TBEN,ENATTN>
real memory  = 3175301120 (3028 MB)
avail memory = 2965155840 (2827 MB)
random: unblocking device.
random: entropy device external interface
kbd0 at kbdmux0
ofwbus0: <Open Firmware Device Tree> on nexus0
```

* none of the diffs in this thing helped
* we're not actually doing the timebase loop because at the point that timebase
sync is setup, the timebase pointer == dummy timebase

So that explains why it's not working on my dual CPU PPC970FX G5 thing. I'll
talk with jhibbits@ more to try and figure out what else is going on.

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