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From: Eric Wong <normalperson@yhbt.net>
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: listen backlog
Date: Fri, 3 Dec 2010 13:49:06 -0800	[thread overview]
Message-ID: <20101203214906.GA11366@dcvr.yhbt.net> (raw)
In-Reply-To: <AANLkTimQYumb9=DOJGm-m8-BWOR9RzdpTP2Ez2UNRsjG@mail.gmail.com>

ghazel@gmail.com wrote:
> On Thu, Dec 2, 2010 at 11:35 PM, Eric Wong <normalperson@yhbt.net> wrote:
> > UNIX sockets are faster for nginx <-> Unicorn, but Raindrops is slower
> > dealing with them since Linux doesn't export UNIX sockets stats to
> > netlink the same way it does for TCP sockets.  So there's always a
> > tradeoff :x
> When does that netlink speed difference matter - only when collecting stats?

Yes, the performance difference is only when collecting stats.

> Using "modprobe inet_diag" made the script spit out a new error:
>             address     active     queued
> linux-tcp-listener-stats.rb:42:in `tcp_listener_stats': NLMSG_ERROR
> (RuntimeError)
>         from linux-tcp-listener-stats.rb:42

I don't think I've ever seen NLMSG_ERROR before.  Are you running
this as the same user that originally bound the listener (the user
of the Unicorn master process)?

> $ sudo modprobe -l inet_diag
> /lib/modules/
> I dug in to raindrops a little bit, and it seems the error associated
> with the NLMSG_ERROR is -2,
> "No such file or directory".

Are you bound to and not  Use if you're bound to that (I had another user on the
raindrops mailing list with that problem).

Eric Wong
Unicorn mailing list - mongrel-unicorn@rubyforge.org
Do not quote signatures (like this one) or top post when replying

  reply	other threads:[~2010-12-03 22:39 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-03  1:35 listen backlog ghazel
2010-12-03  2:39 ` Eric Wong
2010-12-03  5:31   ` ghazel
2010-12-03  7:35     ` Eric Wong
2010-12-03  9:16       ` ghazel
2010-12-03 21:49         ` Eric Wong [this message]
2010-12-03 22:49           ` ghazel
2010-12-04 23:48             ` Eric Wong
2010-12-05  0:02               ` ghazel

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