From: Paolo Bonzini <pbonzini@redhat.com>
To: Ming Lei <tom.leiming@gmail.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <famz@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Stefan Hajnoczi <stefanha@gmail.com>,
qemu-devel <qemu-devel@nongnu.org>,
Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: [Qemu-devel] [regression] dataplane: throughout -40% by commit 580b6b2aa2
Date: Wed, 2 Jul 2014 12:38:45 -0400 (EDT) [thread overview]
Message-ID: <454159199.2388678.1404319125201.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <CACVXFVOc0L-R_P=3Q5gbYM-fZKtQ10QRBmbDWjF3kA-nJ=1f7w@mail.gmail.com>
> On Thu, Jul 3, 2014 at 12:23 AM, Paolo Bonzini <pbonzini@redhat.com> wrote:
> > Il 02/07/2014 18:13, Ming Lei ha scritto:
> >
> >> That must be for generating guest irq, which should have been
> >> processed as batch easily.
> >
> >
> > No, guest irqs are generated (with notify_guest) on every I/O completion
> > even in 2.0.
>
> In 2.0, only notify_guest() is called after event batch is completed,
Ah, you're right.
> I wrote one patch days ago for fixing the problem, and today
> it is just verified that writes can be decreased to 10K from 120K.
Great. Can you test/review my aio_notify patch and submit both then? Bonus
points, but not a requirement IMO, if it also helps non-dataplane.
This would only leave rt_sigprocmask.
> BTW, what do you think about the patch v4 for submitting I/O as batch?
I was waiting for Kevin to review it.
Paolo
next prev parent reply other threads:[~2014-07-02 16:39 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-26 15:14 [Qemu-devel] [regression] dataplane: throughout -40% by commit 580b6b2aa2 Ming Lei
2014-06-26 15:29 ` Paolo Bonzini
2014-06-26 15:37 ` Ming Lei
2014-06-26 15:43 ` Paolo Bonzini
2014-06-26 15:47 ` Ming Lei
2014-06-26 15:57 ` Paolo Bonzini
2014-06-27 1:15 ` Ming Lei
2014-06-27 4:59 ` Paolo Bonzini
2014-06-27 6:23 ` Kevin Wolf
2014-06-27 7:35 ` Paolo Bonzini
2014-06-27 12:35 ` Ming Lei
2014-06-27 7:57 ` Ming Lei
2014-06-27 12:01 ` Stefan Hajnoczi
2014-06-27 12:21 ` Kevin Wolf
2014-06-27 14:50 ` Stefan Hajnoczi
2014-06-27 18:01 ` Ming Lei
2014-06-27 21:51 ` Paolo Bonzini
2014-06-28 9:58 ` Ming Lei
2014-06-30 8:08 ` Stefan Hajnoczi
2014-06-30 8:27 ` Ming Lei
2014-07-01 13:53 ` Ming Lei
2014-07-01 14:31 ` Stefan Hajnoczi
2014-07-01 14:49 ` Ming Lei
2014-07-01 16:49 ` Paolo Bonzini
2014-07-02 0:48 ` Ming Lei
2014-07-02 8:54 ` Stefan Hajnoczi
2014-07-02 9:13 ` Paolo Bonzini
2014-07-02 9:39 ` Kevin Wolf
2014-07-02 9:48 ` Paolo Bonzini
2014-07-02 10:01 ` Kevin Wolf
2014-07-02 10:23 ` Paolo Bonzini
2014-07-02 15:45 ` Ming Lei
2014-07-02 16:13 ` Ming Lei
2014-07-02 16:23 ` Paolo Bonzini
2014-07-02 16:27 ` Ming Lei
2014-07-02 16:38 ` Paolo Bonzini [this message]
2014-07-02 16:41 ` Ming Lei
2014-07-02 16:21 ` Paolo Bonzini
2014-07-03 4:54 ` Ming Lei
2014-07-03 10:29 ` Paolo Bonzini
2014-07-03 11:50 ` Ming Lei
2014-07-03 11:56 ` Paolo Bonzini
2014-07-03 12:09 ` Ming Lei
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