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s=k20201202; t=1709923695; bh=Ps3tsg/vI6hTNUvTwE+RgMHxgKbpabPY7glaQLEYnfU=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=uU4EBlxPCvObe/ePJPxHIDAbGMs501NBFmAVJdwAtTklUD3GE7o85nKNzGSlKhDRd 89dxNu+XhDr7vuhQvEiTzOvmGLv4tLIqfgKtuK58yR24GrcDzcfz/ibk2r6qmmvKKE YUFrn5s0nwj1XTGb0Pwvt7QlR3IMGSQBGWU9qEgJCxsIQuiFuAjvl+BshLfBhpWVpc piYaHoFZFtw0lgyz66ctVNw2EITQIFi3XTNRDMhdp9pRI2xAQ+CYyzpF3TLZSgZEeK BMWcGQLjK4x9qaf86Pn5ICjcIJJVSBEh2ZjlI+YoXczKAb0IkgTAv0caDUQp4QzNiL GBcF616vujdiQ== Message-ID: <0a0345f5c0e14e67541172059cc39ebe389126e5.camel@kernel.org> Subject: Re: [PATCH v2] nfsd: allow more than 64 backlogged connections From: Jeff Layton To: trondmy@gmail.com, Steve Dickson Cc: linux-nfs@vger.kernel.org Date: Fri, 08 Mar 2024 13:48:14 -0500 In-Reply-To: <20240308180223.2965601-1-trond.myklebust@hammerspace.com> References: <20240308180223.2965601-1-trond.myklebust@hammerspace.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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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 Fri, 2024-03-08 at 13:02 -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. > Let's use the POSIX-sanctioned maximum value of SOMAXCONN. >=20 > Signed-off-by: Trond Myklebust > --- > v2: Use SOMAXCONN instead of a value of -1. >=20 > utils/nfsd/nfssvc.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) >=20 > diff --git a/utils/nfsd/nfssvc.c b/utils/nfsd/nfssvc.c > index 46452d972407..9650cecee986 100644 > --- a/utils/nfsd/nfssvc.c > +++ b/utils/nfsd/nfssvc.c > @@ -205,7 +205,8 @@ 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, SOMAXCONN)) { > xlog(L_ERROR, "unable to create listening socket: " > "errno %d (%m)", errno); > rc =3D errno; Reviewed-by: Jeff Layton