From: "Michael S. Tsirkin" <mst@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>,
Eduardo Habkost <ehabkost@redhat.com>,
Sergio Lopez <slp@redhat.com>,
Maran Wilson <maran.wilson@oracle.com>,
Stefan Hajnoczi <stefanha@gmail.com>,
QEMU Developers <qemu-devel@nongnu.org>,
Gerd Hoffmann <kraxel@redhat.com>,
Stefano Garzarella <sgarzare@redhat.com>,
Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH v3 0/4] Introduce the microvm machine type
Date: Thu, 25 Jul 2019 10:42:17 -0400 [thread overview]
Message-ID: <20190725103636-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <dd20e05b-b8f0-c9dd-fdfe-3a3804b90d95@redhat.com>
On Thu, Jul 25, 2019 at 04:13:13PM +0200, Paolo Bonzini wrote:
> On 25/07/19 15:54, Michael S. Tsirkin wrote:
> >> FWIW the "PCI tax" seems to be ~10 ms in QEMU, ~10 ms in the firmware(*)
> >> and ~25 ms in the kernel.
> > How did you measure the qemu time btw?
> >
>
> It's QEMU startup, but not QEMU altogether. For example the time spent
> in memory.c when a BAR is programmed is not part of those 10 ms.
>
> So I just computed q35 qemu startup - microvm qemu startup, it's 65 vs
> 65 ms.
>
> Paolo
Oh so it could be eventfd or whatever, just as well.
I actually wonder whether we spend much time within
synchronize_* calls. eventfd triggers this a lot of times.
How about ioeventfd=off? Does this speed up things?
--
MST
next prev parent reply other threads:[~2019-07-25 14:42 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-02 12:11 [Qemu-devel] [PATCH v3 0/4] Introduce the microvm machine type Sergio Lopez
2019-07-02 12:11 ` [Qemu-devel] [PATCH v3 1/4] hw/virtio: Factorize virtio-mmio headers Sergio Lopez
2019-07-25 9:46 ` Liam Merwick
2019-07-25 9:58 ` Michael S. Tsirkin
2019-07-25 10:03 ` Peter Maydell
2019-07-25 10:36 ` Paolo Bonzini
2019-07-02 12:11 ` [Qemu-devel] [PATCH v3 2/4] hw/i386: Add an Intel MPTable generator Sergio Lopez
2019-07-02 12:11 ` [Qemu-devel] [PATCH v3 3/4] hw/i386: Factorize PVH related functions Sergio Lopez
2019-07-23 8:39 ` Liam Merwick
2019-07-02 12:11 ` [Qemu-devel] [PATCH v3 4/4] hw/i386: Introduce the microvm machine type Sergio Lopez
2019-07-02 13:58 ` Gerd Hoffmann
2019-07-25 10:47 ` Paolo Bonzini
2019-07-02 15:01 ` [Qemu-devel] [PATCH v3 0/4] " no-reply
2019-07-02 15:23 ` Peter Maydell
2019-07-02 17:34 ` Sergio Lopez
2019-07-02 18:04 ` Peter Maydell
2019-07-02 22:04 ` Sergio Lopez
2019-07-25 9:59 ` Michael S. Tsirkin
2019-07-25 10:05 ` Peter Maydell
2019-07-25 10:10 ` Michael S. Tsirkin
2019-07-25 14:52 ` Sergio Lopez
2019-07-25 10:42 ` Sergio Lopez
2019-07-25 11:23 ` Paolo Bonzini
2019-07-25 12:01 ` Stefan Hajnoczi
2019-07-25 12:10 ` Michael S. Tsirkin
2019-07-25 13:26 ` Stefan Hajnoczi
2019-07-25 13:43 ` Paolo Bonzini
2019-07-25 13:54 ` Michael S. Tsirkin
2019-07-25 14:13 ` Paolo Bonzini
2019-07-25 14:42 ` Michael S. Tsirkin [this message]
2019-07-25 14:04 ` Peter Maydell
2019-07-25 14:26 ` Paolo Bonzini
2019-07-25 14:35 ` Michael S. Tsirkin
2019-07-25 14:42 ` Sergio Lopez
2019-07-25 14:58 ` Michael S. Tsirkin
2019-07-25 15:01 ` Michael S. Tsirkin
2019-07-25 15:39 ` Paolo Bonzini
2019-07-25 17:38 ` Michael S. Tsirkin
2019-07-26 12:46 ` Igor Mammedov
2019-07-25 15:49 ` Sergio Lopez
2019-07-25 13:48 ` Michael S. Tsirkin
2019-07-02 15:30 ` no-reply
2019-07-03 9:58 ` Stefan Hajnoczi
2019-07-18 15:21 ` Sergio Lopez
2019-07-19 10:29 ` Stefan Hajnoczi
2019-07-19 13:48 ` Sergio Lopez
2019-07-19 15:09 ` Stefan Hajnoczi
2019-07-19 15:42 ` Montes, Julio
2019-07-23 8:43 ` Sergio Lopez
2019-07-23 9:47 ` Stefan Hajnoczi
2019-07-23 10:01 ` Paolo Bonzini
2019-07-24 11:14 ` Paolo Bonzini
2019-07-25 9:35 ` Sergio Lopez
2019-07-25 10:03 ` Michael S. Tsirkin
2019-07-25 10:55 ` Paolo Bonzini
2019-07-25 14:46 ` Michael S. Tsirkin
2019-07-25 15:35 ` Paolo Bonzini
2019-07-25 17:33 ` Michael S. Tsirkin
2019-07-25 20:30 ` Michael S. Tsirkin
2019-07-26 7:57 ` Paolo Bonzini
2019-07-26 11:10 ` Michael S. Tsirkin
2019-07-23 11:30 ` Stefano Garzarella
2019-07-24 15:23 ` Stefano Garzarella
2019-08-29 9:02 ` Jing Liu
2019-08-29 15:46 ` Sergio Lopez
2019-08-30 4:53 ` Jing Liu
2019-08-30 14:27 ` Sergio Lopez
2019-09-02 5:43 ` Jing Liu
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