linux-kernel - Re: [patch 016/104] epoll: introduce resource usage limits

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Date:	Thu, 22 Jan 2009 21:16:20 -0800
From:	Greg KH <gregkh@...e.de>
To:	Bron Gondwana <brong@...tmail.fm>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable@...nel.org, Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>
Subject: Re: [patch 016/104] epoll: introduce resource usage limits

On Fri, Jan 23, 2009 at 03:51:01PM +1100, Bron Gondwana wrote:
> On Wed, 03 Dec 2008 11:48 -0800, "Greg KH" <gregkh@...e.de> wrote:
> > The default value for "max_user_instances" is set to 128, that should be enough too.
> 
> Our fairly heavily loaded postfix backup mx (lots of spams rejected per day) hit this
> limit running kernel 2.6.27.8.  Any particular reason for it being as low as 128
> by default?

Something had to be picked :)

> This is a kvm virtual machine running on a reasonably beefy external box, but
> with 2Gb RAM allocated to the mx instance because that's all kvm would let me
> use last time I checked.  We're using KVM so the local copy of the database is
> a little further away from the "internet facing side" and so we can build each
> machine with our standard FAI setup.

I would suggest just changing this default value then, it's a simple
userspace configuration item, and for your boxes, it sounds like a
larger value would be more suitable.

thanks,

greg k-h
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