Date: Thu, 7 Nov 2024 07:28:59 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: freebsd-net@freebsd.org Subject: Re: An interesting anomaly in NFS client... Message-ID: <8187509e-c9fb-403f-8569-28ba58425cff@FreeBSD.org> In-Reply-To: <7FFE3D2B-4DD9-4657-ADC1-9C40CB54991F@neville-neil.com> References: <7FFE3D2B-4DD9-4657-ADC1-9C40CB54991F@neville-neil.com>
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On 07/11/2024 02:43, George Neville-Neil wrote: > Howdy, > > We've been digging into an interesting possible issue in the FreeBSD 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. I then attempt to build an out of tree kernel module that > I'm working on. The build looks like it's hanging for 1.5 seconds, and when we > look at the packets (pcap file attached) we see a ton of GETATTRs over the first > 1.5 seconds. I've put the pcap up here: oct_8_2024.pcapng <https:// > people.freebsd.org/~gnn/oct_8_2024.pcapng> > > I also note that an issue was raised on the forums that seems similar, way back > between FreeBSD 10 and 11: > > https://forums.freebsd.org/threads/nfs-cache-misses-after-upgrading-to-11-1- > from-10-3.65491/ <https://forums.freebsd.org/threads/nfs-cache-misses-after- > upgrading-to-11-1-from-10-3.65491/> > > I'm seeing this on 15 currentish (last few months). Could it be just make checking for stale targets? I.e., stat-ing various files to check their timestamps. -- Andriy Gapon
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