Re: TCP_KEEPALIVE for Linux NFS client?

[Calum Mackay <calum.mackay@xxxxxxxxxx>]

hi Ced,

On 22/11/2023 10:48 pm, Cedric Blancher wrote:
> On Mon, 20 Nov 2023 at 03:57, Olga Kornievskaia <aglo@xxxxxxxxx> wrote:
> > Hi Ced,
> >
> > Why do you think it doesn't use it? Have you looked at a network trace
> > of an idle connection? I seem to recall seeing keep-alive being used.
>
> Well, I don't see a setsockopt(TCP_KEEPALIVE) in the libtirpc code?

We have this, in the kernel RPC code:

	https://elixir.bootlin.com/linux/latest/source/net/sunrpc/xprtsock.c#L2257

which might be it.

cheers,
calum.

> Ced
>
> > On Fri, Nov 17, 2023 at 8:02 PM Cedric Blancher
> > <cedric.blancher@xxxxxxxxx> wrote:
> > > Good morning!
> > >
> > > Why does the Linux NFS client not use TCP_KEEPALIVE for its TCP
> > > connections? What are the pro and cons of using that for NFS TCP
> > > connections?
> > >
> > > Ced
> > > --
> > > Cedric Blancher <cedric.blancher@xxxxxxxxx>
> > > [https://plus.google.com/u/0/+CedricBlancher/]
> > > Institute Pasteur

--
Calum Mackay
Linux Kernel Engineering
Oracle Linux and Virtualisation

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