From: Willy Tarreau <w@1wt.eu>
To: Eric Dumazet <edumazet@google.com>
Cc: "David S . Miller" <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>,
Eric Dumazet <eric.dumazet@gmail.com>,
Neal Cardwell <ncardwell@google.com>,
Yuchung Cheng <ycheng@google.com>, Yue Cao <ycao009@ucr.edu>
Subject: Re: [PATCH net] net: increase SOMAXCONN to 4096
Date: Thu, 31 Oct 2019 05:35:41 +0100 [thread overview]
Message-ID: <20191031043541.GA30153@1wt.eu> (raw)
In-Reply-To: <CANn89i+8FOTfq328Tv4YvhcTEn9fte6Wm4YizqubcRz=0gyiwQ@mail.gmail.com>
On Wed, Oct 30, 2019 at 08:46:26PM -0700, Eric Dumazet wrote:
> On Wed, Oct 30, 2019 at 8:36 PM Willy Tarreau <w@1wt.eu> wrote:
> > Just a quick question, I remember that when somaxconn is greater than
> > tcp_max_syn_backlog, SYN cookies are never emitted, but I think it
> > recently changed and there's no such constraint anymore. Do you
> > confirm it's no more needed, or should we also increase this latter
> > one accordingly ?
> >
>
> There is no relationship like that.
>
> The only place somaxconn is use is in __sys_listen() to cap the
> user-provided backlog.
>
> somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn;
> if ((unsigned int)backlog > somaxconn)
> backlog = somaxconn;
OK, thanks for checking.
Willy
next prev parent reply other threads:[~2019-10-31 9:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-30 16:36 [PATCH net] net: increase SOMAXCONN to 4096 Eric Dumazet
2019-10-31 3:36 ` Willy Tarreau
2019-10-31 3:46 ` Eric Dumazet
2019-10-31 4:35 ` Willy Tarreau [this message]
2019-10-31 21:02 ` David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191031043541.GA30153@1wt.eu \
--to=w@1wt.eu \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=eric.dumazet@gmail.com \
--cc=ncardwell@google.com \
--cc=netdev@vger.kernel.org \
--cc=ycao009@ucr.edu \
--cc=ycheng@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.