From: Christian Borntraeger <borntraeger@de.ibm.com>
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
Subject: Re: [Qemu-devel] [PATCH RFC 0/4] aio: Use epoll_wait in aio_poll
Date: Tue, 07 Jul 2015 16:54:20 +0200 [thread overview]
Message-ID: <559BE81C.90602@de.ibm.com> (raw)
In-Reply-To: <1435670385-625-1-git-send-email-famz@redhat.com>
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?
next prev parent reply other threads:[~2015-07-07 14:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-30 13:19 [Qemu-devel] [PATCH RFC 0/4] aio: Use epoll_wait in aio_poll Fam Zheng
2015-06-30 13:19 ` [Qemu-devel] [PATCH RFC 1/4] aio: Introduce aio_set_fd_handler_pri Fam Zheng
2015-07-07 14:29 ` Stefan Hajnoczi
2015-07-08 1:07 ` Fam Zheng
2015-06-30 13:19 ` [Qemu-devel] [PATCH RFC 2/4] aio: Move aio_set_fd_handler to async.c Fam Zheng
2015-07-07 14:30 ` Stefan Hajnoczi
2015-06-30 13:19 ` [Qemu-devel] [PATCH RFC 3/4] aio: Introduce aio_context_setup Fam Zheng
2015-07-07 14:35 ` Stefan Hajnoczi
2015-07-08 1:15 ` Fam Zheng
2015-07-08 10:51 ` Stefan Hajnoczi
2015-06-30 13:19 ` [Qemu-devel] [PATCH RFC 4/4] aio-posix: Use epoll in aio_poll Fam Zheng
2015-07-07 15:08 ` Stefan Hajnoczi
2015-07-07 15:27 ` Paolo Bonzini
2015-07-08 1:01 ` Fam Zheng
2015-07-08 10:58 ` Stefan Hajnoczi
2015-07-10 0:46 ` Fam Zheng
2015-07-13 10:02 ` Stefan Hajnoczi
2015-07-07 14:54 ` Christian Borntraeger [this message]
2015-07-08 1:02 ` [Qemu-devel] [PATCH RFC 0/4] aio: Use epoll_wait " Fam Zheng
2015-07-08 7:59 ` Christian Borntraeger
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