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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2024-03-07 at 16:39 -0500, trondmy@gmail.com wrote: > From: Trond Myklebust >=20 > When creating a listener socket to be handed to /proc/fs/nfsd/portlist, > we currently limit the number of backlogged connections to 64. Since > that value was chosen in 2006, the scale at which data centres operate > has changed significantly. Given a modern server with many thousands of > clients, a limit of 64 connections can create bottlenecks, particularly > at at boot time. > By converting to using an argument of -1, we allow the backlog to be set > by the default value in /proc/sys/net/core/somaxconn. >=20 > Signed-off-by: Trond Myklebust > --- > utils/nfsd/nfssvc.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) >=20 > diff --git a/utils/nfsd/nfssvc.c b/utils/nfsd/nfssvc.c > index 46452d972407..c781054dbdae 100644 > --- a/utils/nfsd/nfssvc.c > +++ b/utils/nfsd/nfssvc.c > @@ -205,7 +205,7 @@ nfssvc_setfds(const struct addrinfo *hints, const cha= r *node, const char *port) > rc =3D errno; > goto error; > } > - if (addr->ai_protocol =3D=3D IPPROTO_TCP && listen(sockfd, 64)) { > + if (addr->ai_protocol =3D=3D IPPROTO_TCP && listen(sockfd, -1)) { > xlog(L_ERROR, "unable to create listening socket: " > "errno %d (%m)", errno); > rc =3D errno; It does look like the kernel casts the value to unsigned int before trying to interpret it, but that doesn't seem to be documented anywhere that I can find. It's certainly not in the manpage There is this in /usr/include/bits/socket.h: /* Maximum queue length specifiable by listen. */ #define SOMAXCONN 4096 ...but I guess that's problematic if you set "somaxconn" sysctl higher. I wonder if SOMAXCONN should be redefined as "(int)UINT_MAX" in the UAPI headers? --=20 Jeff Layton