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Date:      Thu, 07 Nov 2024 09:32:22 -0800
From:      George Neville-Neil <gnn@neville-neil.com>
To:        Andriy Gapon <avg@FreeBSD.org>
Cc:        freebsd-net@freebsd.org
Subject:   Re: An interesting anomaly in NFS client...
Message-ID:  <0282629B-336F-46D4-8335-15F9BE8A7EE9@neville-neil.com>
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 6 Nov 2024, at 21:28, 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 N=
FS client. Here is the scenario. I have a FreeBSD VM on my Mac, the Mac i=
s 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 hangin=
g for 1.5 seconds, and when we look at the packets (pcap file attached) w=
e 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.pcap=
ng>
>>
>> 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-mis=
ses-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.
>

15,000 of them?  Seems excessive for a kernel module of 10 files, but may=
be it's walking /usr/obj ?

Best,
George



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