Date: Tue, 13 Jan 2026 17:44:32 -0500 From: Justin Hibbits <jhibbits@FreeBSD.org> To: Timothy Pearson <tpearson@raptorengineering.com> Cc: Lexi Winter <ivy@freebsd.org>, freebsd-ppc <freebsd-ppc@freebsd.org> Subject: Re: 2026 TODO list! Message-ID: <20260113174432.29b0b396@ralga.knownspace> In-Reply-To: <347736550.201698.1768339625331.JavaMail.zimbra@raptorengineeringinc.com> References: <CAJ-VmonYHdVhdPiaLHUqzPv33_iAGiTY=_hGrhg4rXF5%2BYZPQQ@mail.gmail.com> <aWYThFQ8ODI9P0ml@amaryllis.le-fay.org> <347736550.201698.1768339625331.JavaMail.zimbra@raptorengineeringinc.com>
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On Tue, 13 Jan 2026 15:27:05 -0600 (CST) Timothy Pearson <tpearson@raptorengineering.com> wrote: > ----- Original Message ----- > > From: "Lexi Winter" <ivy@freebsd.org> > > To: "freebsd-ppc" <freebsd-ppc@freebsd.org> > > Sent: Tuesday, January 13, 2026 3:42:28 AM > > Subject: Re: 2026 TODO list! > > > Adrian Chadd wrote in > > <CAJ-VmonYHdVhdPiaLHUqzPv33_iAGiTY=_hGrhg4rXF5+YZPQQ@mail.gmail.com>: > > > >> I'd like to assemble a 2026 TODO list for PPC64 work. Justin, Ivy, > >> Warner, I and and others have been poking at the sharp edges and > >> trying to use/abuse various PPC64 hardware and VMs. > >> > >> I'd appreciate some brainstorming from y'all about what you'd like > >> to see fixed, implemented and working. > > > > i've been meaning to look at making lldb work on powerpc64le for > > both kernel and userland debugging. this looks like it should be > > pretty simple, since it already supports FreeBSD/ppc64 and > > Linux/ppc64le, so it's just a matter of combining the two. > > > > i've been busy with non-FreeBSD stuff recently but i'm hoping i can > > look at this soon. > > > > Raptor has kindly given me access to a Talos II so i can do dev work > > and also test patches there if needed. > > > > a couple of other things i think are important: > > > > - non-OpenFirmware ppc64le loader - i see a couple of people have > > already mentioned this. > > > > - SMP performance is quite bad; this 44-core SMT4 Talos II runs > > buildworld at the same speed as my 8-core 2.6GHz Xeon system. > > i mentioned this to Justin and he suspects this could be from > > locking issues in vm/pmap. > > After digging around in the PCI driver for the past month, I think > we're also not getting DMA enabled on potentially *any* PCI devices. > It looks like the DMA tag was removed for PHB4 (POWER9) support, but > it might have worked on PHB3 (POWER8). Once I finish fixing the rest > of the PE 1:1 mapping mess I'll start looking at that and see if we > can't get DMA reenabled -- no DMA would definitely explain poor > performance on disk intensive activity... > DMA should be active already. Without a bus tag it defaults to nexus, which allows all as 1:1, so no translation, restrictions, or anything like that. Also no IOMMU is attached. - Justinhome | help
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