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

From: Greg KH
Date: Fri Jan 23 2009 - 00:23:48 EST

On Fri, Jan 23, 2009 at 03:51:01PM +1100, Bron Gondwana wrote:
> On Wed, 03 Dec 2008 11:48 -0800, "Greg KH" <gregkh@xxxxxxx> 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 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.


greg k-h
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at