From: Evgeniy Polyakov <zbr@ioremap.net>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Gaspar Chilingarov <gasparch@gmail.com>, netdev <netdev@vger.kernel.org>
Subject: Re: PROBLEM: Linux kernel 2.6.31 IPv4 TCP fails to open huge amount of outgoing connections (unable to bind ... )
Date: Wed, 21 Apr 2010 04:14:48 +0400 [thread overview]
Message-ID: <20100421001448.GA31724@ioremap.net> (raw)
In-Reply-To: <1271806945.7895.581.camel@edumazet-laptop>
Hi.
On Wed, Apr 21, 2010 at 01:42:25AM +0200, Eric Dumazet (eric.dumazet@gmail.com) wrote:
> If you want to check source, its in file net/ipv4/inet_connection_sock.c
>
> function inet_csk_get_port()
>
> you can remove the
>
> if (atomic_read(&hashinfo->bsockets) > (high - low) + 1) {
> spin_unlock(&head->lock);
> snum = smallest_rover;
> goto have_snum;
> }
>
> It will solve your problem (but bind() will probably be slow)
Netcat uses SO_REUSEADDR, so its the code path which generates an error,
but this part actually returns a port number not en error. I suppose
what happend is 'attempts' check faired and thus system failed to find
a small enough bucket which does not conflict. To test this we can
remove 'smallest_size = tb->num_owners;' assignment, but bind() can be
damn slow in this case indeed.
--
Evgeniy Polyakov
next prev parent reply other threads:[~2010-04-21 0:45 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-20 22:17 PROBLEM: Linux kernel 2.6.31 IPv4 TCP fails to open huge amount of outgoing connections (unable to bind ... ) Gaspar Chilingarov
2010-04-20 22:31 ` Eric Dumazet
2010-04-20 23:18 ` Gaspar Chilingarov
2010-04-20 23:42 ` Eric Dumazet
2010-04-21 0:14 ` Evgeniy Polyakov [this message]
2010-04-20 23:07 ` Ben Greear
2010-04-20 23:20 ` Gaspar Chilingarov
2010-04-20 23:20 ` Gaspar Chilingarov
2010-04-20 23:30 ` Ben Greear
2010-04-20 23:35 ` Gaspar Chilingarov
2010-04-20 23:49 ` Ben Greear
2010-04-20 23:57 ` Gaspar Chilingarov
2010-04-21 0:14 ` Eric Dumazet
2010-04-21 0:05 ` Eric Dumazet
2010-04-21 0:12 ` Gaspar Chilingarov
2010-04-21 0:14 ` David Miller
2010-04-21 0:30 ` Evgeniy Polyakov
2010-04-21 2:04 ` David Miller
2010-04-21 5:46 ` Eric Dumazet
2010-04-21 8:25 ` Evgeniy Polyakov
2010-04-21 9:02 ` Eric Dumazet
2010-04-21 9:58 ` Evgeniy Polyakov
2010-04-21 10:21 ` Eric Dumazet
2010-04-21 11:27 ` Eric Dumazet
2010-04-21 16:52 ` George B.
2010-04-21 18:27 ` Evgeniy Polyakov
2010-04-21 18:43 ` Eric Dumazet
2010-04-21 18:58 ` Evgeniy Polyakov
2010-04-21 19:26 ` Eric Dumazet
2010-04-21 20:08 ` Evgeniy Polyakov
2010-04-23 2:06 ` David Miller
2010-04-25 14:26 ` Michael S. Tsirkin
2010-04-25 15:56 ` Evgeniy Polyakov
2010-04-25 16:13 ` Eric Dumazet
2010-04-25 16:21 ` Eric Dumazet
2010-04-25 16:35 ` Michael S. Tsirkin
2010-04-25 22:08 ` David Miller
2010-04-21 19:03 ` Narendra Choyal
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=20100421001448.GA31724@ioremap.net \
--to=zbr@ioremap.net \
--cc=eric.dumazet@gmail.com \
--cc=gasparch@gmail.com \
--cc=netdev@vger.kernel.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).