From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:34412)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <borntraeger@de.ibm.com>) id 1ZCUGT-0000Jv-IA
	for qemu-devel@nongnu.org; Tue, 07 Jul 2015 10:54:31 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <borntraeger@de.ibm.com>) id 1ZCUGQ-0005Yz-14
	for qemu-devel@nongnu.org; Tue, 07 Jul 2015 10:54:29 -0400
Received: from e06smtp12.uk.ibm.com ([195.75.94.108]:49978)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <borntraeger@de.ibm.com>) id 1ZCUGP-0005YY-Ma
	for qemu-devel@nongnu.org; Tue, 07 Jul 2015 10:54:25 -0400
Received: from /spool/local
	by e06smtp12.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use
	Only! Violators will be prosecuted
	for <qemu-devel@nongnu.org> from <borntraeger@de.ibm.com>;
	Tue, 7 Jul 2015 15:54:24 +0100
Message-ID: <559BE81C.90602@de.ibm.com>
Date: Tue, 07 Jul 2015 16:54:20 +0200
From: Christian Borntraeger <borntraeger@de.ibm.com>
MIME-Version: 1.0
References: <1435670385-625-1-git-send-email-famz@redhat.com>
In-Reply-To: <1435670385-625-1-git-send-email-famz@redhat.com>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH RFC 0/4] aio: Use epoll_wait in aio_poll
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Fam Zheng <famz@redhat.com>, qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>, pbonzini@redhat.com, Stefan Hajnoczi <stefanha@redhat.com>, qemu-block@nongnu.org

Am 30.06.2015 um 15:19 schrieb Fam Zheng:
> epoll is more scalable than ppoll. It performs faster than ppoll when the
> number of polled fds is high.
> 
> See patch 4 for an example of the senario and some benchmark data.
> 
> Note: it is only effective on iothread (dataplane), while the main loop cannot
> benefit from this yet, because the iohandler and chardev GSource's don't easily
> fit into this epoll interface style (that's why main loop uses qemu_poll_ns
> directly instead of aio_poll()).
> 
> There is hardly any timer activity in iothreads for now, as a result the
> timeout is always 0 or -1. Therefore, timerfd, or the said nanosecond
> epoll_pwait1 interface, which fixes the timeout granularity deficiency is not
> immediately necessary at this point, but still that will be simple to add.
> 
> Please review!

Is there a branch somewhere, so that I could give it a spin?