Date: Wed, 06 Nov 2024 19:43:27 -0500 From: George Neville-Neil <gnn@neville-neil.com> To: FreeBSD Net <freebsd-net@freebsd.org> Subject: An interesting anomaly in NFS client... Message-ID: <7FFE3D2B-4DD9-4657-ADC1-9C40CB54991F@neville-neil.com>
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--=_MailMate_777B0B86-AA2D-4B0C-AF65-9C69B97D87EA_= Content-Type: text/plain; format=flowed; markup=markdown Content-Transfer-Encoding: quoted-printable 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/ I'm seeing this on 15 currentish (last few months). Best, George --=_MailMate_777B0B86-AA2D-4B0C-AF65-9C69B97D87EA_= Content-Type: text/html Content-Transfer-Encoding: quoted-printable <!DOCTYPE html> <html> <head> <meta http-equiv=3D"Content-Type" content=3D"text/xhtml; charset=3Dutf-8"= > </head> <body><div style=3D"font-family: sans-serif;"><div class=3D"markdown" sty= le=3D"white-space: normal;"> <p dir=3D"auto">Howdy,</p> <p dir=3D"auto">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'v= e put the pcap up here: <a href=3D"https://people.freebsd.org/~gnn/oct_8_= 2024.pcapng" style=3D"color: #3983C4;">oct_8_2024.pcapng</a></p> <p dir=3D"auto">I also note that an issue was raised on the forums that s= eems similar, way back between FreeBSD 10 and 11:</p> <p dir=3D"auto"><a href=3D"https://forums.freebsd.org/threads/nfs-cache-m= isses-after-upgrading-to-11-1-from-10-3.65491/" style=3D"color: #3983C4;"= >https://forums.freebsd.org/threads/nfs-cache-misses-after-upgrading-to-1= 1-1-from-10-3.65491/</a></p> <p dir=3D"auto">I'm seeing this on 15 currentish (last few months).</p> <p dir=3D"auto">Best,<br> George</p> </div> </div> </body> </html> --=_MailMate_777B0B86-AA2D-4B0C-AF65-9C69B97D87EA_=--
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