Date: Tue, 13 Jan 2026 17:30:35 -0600 (CST) From: Timothy Pearson <tpearson@raptorengineering.com> To: jhibbits <jhibbits@FreeBSD.org> Cc: Timothy Pearson <tpearson@raptorengineering.com>, Lexi Winter <ivy@freebsd.org>, freebsd-ppc <freebsd-ppc@freebsd.org> Subject: Re: 2026 TODO list! Message-ID: <1484165011.201856.1768347035495.JavaMail.zimbra@raptorengineeringinc.com> In-Reply-To: <20260113174432.29b0b396@ralga.knownspace> References: <CAJ-VmonYHdVhdPiaLHUqzPv33_iAGiTY=_hGrhg4rXF5%2BYZPQQ@mail.gmail.com> <aWYThFQ8ODI9P0ml@amaryllis.le-fay.org> <347736550.201698.1768339625331.JavaMail.zimbra@raptorengineeringinc.com> <20260113174432.29b0b396@ralga.knownspace>
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----- Original Message ----- > From: "jhibbits" <jhibbits@FreeBSD.org> > To: "Timothy Pearson" <tpearson@raptorengineering.com> > Cc: "Lexi Winter" <ivy@freebsd.org>, "freebsd-ppc" <freebsd-ppc@freebsd.org> > Sent: Tuesday, January 13, 2026 4:44:32 PM > Subject: Re: 2026 TODO list! > 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. Oh, interesting, didn't know that. Thanks for the info! :)home | help
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