From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jan Beulich" <JBeulich@novell.com>
Subject: Re: increase evtchn limits
Date: Fri, 21 May 2010 12:09:12 +0100
Message-ID: <4BF685F802000078000037C5@vpn.id2.novell.com>
References: <C81C1035.14D86%keir.fraser@eu.citrix.com>
	<C81C10EF.14D8A%keir.fraser@eu.citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <C81C10EF.14D8A%keir.fraser@eu.citrix.com>
Content-Disposition: inline
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Keir Fraser <keir.fraser@eu.citrix.com>, "mukesh.rathor@oracle.com" <mukesh.rathor@oracle.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org

>>> On 21.05.10 at 11:29, Keir Fraser <keir.fraser@eu.citrix.com> wrote:
> On 21/05/2010 10:25, "Keir Fraser" <keir.fraser@eu.citrix.com> wrote:
>=20
>>> There are 5 event channels per CPU (timer, reschedule IPI, SMP call =
function
>>> IPI, SMP call function single IPI, and spinlock wakeup IPI).
>=20
>=20
> It would be very easy to collapse the four IPIs onto one event channel =
plus
> a bitmask of IPI reasons. Then that would be a much more economical two
> event channels per CPU. And the change is a hell of a lot easier to
> implement than extensible event channels. I bet it could be knocked =
together
> in an hour.

Indeed, it didn't occur to me to do it that way, but this sounds pretty
strait forward to implement.

Thanks, Jan