From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
To: Guillaume Thouvenin <guillaume.thouvenin@bull.net>
Cc: Kaigai Kohei <kaigai@ak.jp.nec.com>,
hadi@cyberus.ca, Thomas Graf <tgraf@suug.ch>,
Andrew Morton <akpm@osdl.org>,
marcelo.tosatti@cyclades.com,
"David S. Miller" <davem@redhat.com>,
jlan@sgi.com, LSE-Tech <lse-tech@lists.sourceforge.net>,
lkml <linux-kernel@vger.kernel.org>,
netdev@oss.sgi.com, elsa-devel <elsa-devel@lists.sourceforge.net>
Subject: Re: [Lse-tech] Re: A common layer for Accounting packages
Date: Tue, 01 Mar 2005 17:17:57 +0300 [thread overview]
Message-ID: <1109686677.28266.66.camel@uganda> (raw)
In-Reply-To: <1109685236.8594.75.camel@frecb000711.frec.bull.fr>
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On Tue, 2005-03-01 at 14:53 +0100, Guillaume Thouvenin wrote:
> On Tue, 2005-03-01 at 22:38 +0900, Kaigai Kohei wrote:
> > > I tested without user space listeners and the cost is negligible. I will
> > > test with a user space listeners and see the results. I'm going to run
> > > the test this week after improving the mechanism that switch on/off the
> > > sending of the message.
> >
> > I'm also trying to mesure the process-creation/destruction performance on following three environment.
> > Archtechture: i686 / Distribution: Fedora Core 3
> > * Kernel Preemption is DISABLE
> > * SMP kernel but UP-machine / Not Hyper Threading
> > [1] 2.6.11-rc4-mm1 normal
> > [2] 2.6.11-rc4-mm1 with PAGG based Process Accounting Module
> > [3] 2.6.11-rc4-mm1 with fork-connector notification (it's enabled)
> >
> > When 367th-fork() was called after fork-connector notification, kernel was locked up.
> > (User-Space-Listener has been also run until 366th-fork() notification was received)
>
> I don't see this limit on my computer. I'm currently running the lmbench
> with a new fork connector patch (one that enable/disable fork connector)
> on an SMP computer. I will send results and the new patch tomorrow
> because the test takes a while...
>
> I'm using a small patch provided by Evgeniy and not included in the
> 2.6.11-rc4-mm1 tree.
2.6.11-rc4-mm1 tree does not have the latest connector.
Various fixes were added, not only that.
I run the latest patch Guillaume sent to me(with small updates),
fork bomb with more than 100k forks passed already without any freeze.
I do not have numbers thought.
> Best regards,
> Guillaume
>
> --- orig/connector.c
> +++ mod/connector.c
> @@ -168,12 +168,11 @@
> group = NETLINK_CB((skb)).groups;
> msg = (struct cn_msg *)NLMSG_DATA(nlh);
>
> - if (msg->len != nlh->nlmsg_len - sizeof(*msg) - sizeof(*nlh)) {
> + if (NLMSG_SPACE(msg->len + sizeof(*msg)) != nlh->nlmsg_len) {
> printk(KERN_ERR "skb does not have enough length: "
> - "requested msg->len=%u[%u], nlh->nlmsg_len=%u[%u], skb->len=%u[must be %u].\n",
> - msg->len, NLMSG_SPACE(msg->len),
> - nlh->nlmsg_len, nlh->nlmsg_len - sizeof(*nlh),
> - skb->len, msg->len + sizeof(*msg));
> + "requested msg->len=%u[%u], nlh->nlmsg_len=%u, skb->len=%u.\n",
> + msg->len, NLMSG_SPACE(msg->len + sizeof(*msg)),
> + nlh->nlmsg_len, skb->len);
> kfree_skb(skb);
> return -EINVAL;
> }
>
--
Evgeniy Polyakov
Crash is better than data corruption -- Arthur Grabowski
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next prev parent reply other threads:[~2005-03-01 14:14 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-19 0:51 A common layer for Accounting packages Jay Lan
2005-02-19 1:16 ` Andrew Morton
2005-02-21 6:51 ` Guillaume Thouvenin
2005-02-22 20:11 ` [Lse-tech] " Jay Lan
2005-02-23 7:30 ` Guillaume Thouvenin
2005-02-21 7:54 ` Kaigai Kohei
2005-02-22 20:26 ` Jay Lan
2005-02-23 7:07 ` Kaigai Kohei
2005-02-23 7:20 ` Andrew Morton
2005-02-23 8:33 ` Guillaume Thouvenin
2005-02-23 8:51 ` Andrew Morton
2005-02-23 9:30 ` Guillaume Thouvenin
2005-02-23 9:36 ` Andrew Morton
2005-02-23 19:11 ` Jay Lan
2005-02-24 7:42 ` Guillaume Thouvenin
2005-02-23 9:50 ` Tim Schmielau
2005-02-24 22:27 ` Jay Lan
2005-02-23 11:29 ` Kaigai Kohei
2005-02-23 20:48 ` Jay Lan
2005-02-25 5:07 ` Kaigai Kohei
2005-02-25 5:28 ` Andrew Morton
2005-02-25 17:32 ` Jay Lan
2005-02-25 17:45 ` Chris Wright
2005-02-25 18:11 ` Jay Lan
2005-02-25 21:30 ` Andrew Morton
2005-02-25 22:18 ` Jay Lan
2005-02-27 9:49 ` Marcelo Tosatti
2005-02-27 15:20 ` KaiGai Kohei
2005-02-27 14:03 ` Marcelo Tosatti
2005-02-27 19:27 ` David S. Miller
2005-02-28 1:59 ` Kaigai Kohei
2005-02-28 2:32 ` Thomas Graf
2005-02-28 5:17 ` Evgeniy Polyakov
2005-02-28 7:20 ` Guillaume Thouvenin
2005-02-28 7:39 ` Andrew Morton
2005-02-28 8:04 ` Evgeniy Polyakov
2005-02-28 12:10 ` jamal
2005-02-28 9:29 ` Marcelo Tosatti
2005-02-28 13:20 ` Thomas Graf
2005-02-28 13:40 ` jamal
2005-02-28 13:53 ` Thomas Graf
2005-02-28 9:52 ` Marcelo Tosatti
2005-02-28 14:10 ` jamal
2005-02-28 14:25 ` Thomas Graf
2005-02-28 15:31 ` jamal
2005-02-28 16:17 ` Evgeniy Polyakov
2005-03-01 8:21 ` Guillaume Thouvenin
2005-03-01 13:38 ` Kaigai Kohei
2005-03-01 13:53 ` Guillaume Thouvenin
2005-03-01 14:17 ` Evgeniy Polyakov [this message]
2005-03-02 4:50 ` Paul Jackson
2005-03-02 8:58 ` Guillaume Thouvenin
2005-03-02 9:06 ` Andrew Morton
2005-03-02 9:25 ` Guillaume Thouvenin
2005-03-02 15:30 ` Paul Jackson
2005-03-01 20:40 ` Paul Jackson
2005-02-24 1:25 ` Paul Jackson
2005-02-24 1:56 ` Jay Lan
2005-02-24 2:07 ` Paul Jackson
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