Date: Fri, 8 Nov 2024 07:58:48 -0800 From: Rick Macklem <rick.macklem@gmail.com> To: George Neville-Neil <gnn@neville-neil.com> Cc: Mark Saad <nonesuch@longcount.org>, freebsd-net@freebsd.org Subject: Re: An interesting anomaly in NFS client... Message-ID: <CAM5tNy55mJABnJBRL3FMeqtwyeEQbRmBgP7nxO8J7zqROfdLtA@mail.gmail.com> In-Reply-To: <DBB21A78-284C-4A97-892A-219E881D6DD8@neville-neil.com> References: <8187509e-c9fb-403f-8569-28ba58425cff@FreeBSD.org> <D1D03377-1A7B-47FA-B40D-2A30D0855F07@longcount.org> <9BD96F0F-363F-45BF-B3AF-BDEBD4B46175@neville-neil.com> <CAM5tNy7W9kHOFLoJWsU_1fU=%2BZ5OoDU7axw3izUv4GPWXpAF2A@mail.gmail.com> <DBB21A78-284C-4A97-892A-219E881D6DD8@neville-neil.com>
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On Thu, Nov 7, 2024 at 9:41=E2=80=AFPM George Neville-Neil <gnn@neville-nei= l.com> wrote: > > > > On 7 Nov 2024, at 13:59, Rick Macklem wrote: > > > On Thu, Nov 7, 2024 at 9:34=E2=80=AFAM George Neville-Neil <gnn@neville= -neil.com> wrote: > >> > >> > >> > >> On 7 Nov 2024, at 4:15, Mark Saad wrote: > >> > >>>> > >>>> On Nov 7, 2024, at 12:29=E2=80=AFAM, Andriy Gapon <avg@freebsd.org> = wrote: > >>>> > >>>> =EF=BB=BFOn 07/11/2024 02:43, George Neville-Neil wrote: > >>>>> Howdy, > >>>>> We've been digging into an interesting possible issue in the FreeBS= D NFS client. Here is the scenario. I have a FreeBSD VM on my Mac, the Mac = is the NFS server, the VM is the client. > >>> > >>> What are you using to run the vm ? What architecture is the vm ? What= about the Mac ? > >> > >> qemu, aarch64, M3 Mac. > >> > >> I doubt this is the source of the issue. > >> > >> I was poking through the code and I wonder if a slight time skew might= be an issue. I'm going to check into that. The VM and the Mac both us NT= P to stay in sync with the world, but who knows... > > Hi George, > > > > I'll take a look at the packet trace later, but... > > > > If you can easily reproduce the issue, do a: > > # nfsstat -E -c -z > > - before reproducing it, and a > > # nfsstat -E -c > > - after. Then look at the Cache Info: at the end of the output. > > > > I'll give that a look, and the thing that Mark found is also interesting.= I might ask Warner about it tomorrow, we're both at the Dev Summit. When I looked at the packet trace, I saw a lot of GETATTRs for different directories. If they are different directories and not the same ones over and over again, caching will not be the issue. (Btw, the attribute caching code hasn't changed in decades, afaik.) Have fun at the dev summit, rick > > Thanks, > George
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