Date: Thu, 7 Nov 2024 17:09:21 -0500 From: Mark Johnston <markj@freebsd.org> To: Andriy Gapon <avg@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: An interesting anomaly in NFS client... Message-ID: <Zy06kX6pJIuMzoFB@nuc> In-Reply-To: <8187509e-c9fb-403f-8569-28ba58425cff@FreeBSD.org> References: <7FFE3D2B-4DD9-4657-ADC1-9C40CB54991F@neville-neil.com> <8187509e-c9fb-403f-8569-28ba58425cff@FreeBSD.org>
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On Thu, Nov 07, 2024 at 07:28:59AM +0200, Andriy Gapon wrote: > 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. I suspect it is from this line in sys/conf/config.mk: __MPATH!=find ${SYSDIR:tA}/ -name \*_if.m This is running a find command over all of sys/, so it'll stat about 35000 files. I believe it's from https://cgit.freebsd.org/src/commit/?id=12f05b84463baacfada5a79eaed061a4899d98aa
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