From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
To: linux-kernel@vger.kernel.org
Cc: Thomas Graf <tgraf@suug.ch>,
"David S. Miller" <davem@davemloft.net>,
Nikolay Aleksandrov <nikolay@redhat.com>
Subject: Re: getaddrinfo slowdown in 3.17.1, due to getifaddrs
Date: Sat, 18 Oct 2014 12:45:25 +0200 [thread overview]
Message-ID: <20141018104525.GA15789@sesse.net> (raw)
In-Reply-To: <20141017003430.GB29584@sesse.net>
On Fri, Oct 17, 2014 at 02:34:30AM +0200, Steinar H. Gunderson wrote:
> e341694e3eb57fcda9f1adc7bfea42fe080d8d7a looks like it might cause something
> like this (it certainly added the synchronize_net() call). Cc-ing people on
> that commit; quoting the entire rest of the message for reference.
I see there's discussion on what to do with this; thanks. :-)
FWIW, I've verified that reverting these four patches (in that order) fixes
the problem:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/net/netlink/af_netlink.c?id=9ce12eb16ffb143f3a509da86283ddd0b10bcdb3
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/net/netlink/af_netlink.c?id=6c8f7e70837468da4e658080d4448930fb597e1b
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/net/netlink/af_netlink.c?id=67a24ac18b0262178ba9f05501b2c6e6731d449a
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/net/netlink/af_netlink.c?id=e341694e3eb57fcda9f1adc7bfea42fe080d8d7a
My Perl script is seemingly not the only affected program on the system;
witness the average page load times for our PHP-based home page:
http://home.samfundet.no/~sesse/web_load_time_samfundet_no-week.png
/* Steinar */
--
Homepage: http://www.sesse.net/
prev parent reply other threads:[~2014-10-18 11:30 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-17 0:21 getaddrinfo slowdown in 3.17.1, due to getifaddrs Steinar H. Gunderson
2014-10-17 0:34 ` Steinar H. Gunderson
2014-10-17 6:25 ` Thomas Graf
2014-10-17 16:28 ` Eric Dumazet
2014-10-17 16:30 ` David Miller
2014-10-17 21:19 ` Eric Dumazet
2014-10-21 13:25 ` Steinar H. Gunderson
2014-10-21 13:31 ` Thomas Graf
2014-10-23 23:37 ` Steinar H. Gunderson
2014-11-02 21:55 ` Steinar H. Gunderson
2014-11-02 23:25 ` David Miller
2014-10-18 10:45 ` Steinar H. Gunderson [this message]
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