From: Dario Faggioli <dario.faggioli@citrix.com>
To: xen-devel <xen-devel@lists.xenproject.org>
Subject: [Fwd: Re: Wondering about cirris and stdvga]
Date: Fri, 18 Nov 2016 22:57:54 +0100 [thread overview]
Message-ID: <1479506274.3832.74.camel@citrix.com> (raw)
In-Reply-To: 1479500639.16973.3.camel@redhat.com
-------- Forwarded Message --------
From: Adam Jackson <ajax@redhat.com>
Subject: Re: Wondering about cirris and stdvga
Date: Fri, 18 Nov 2016 15:23:59 -0500
Message-Id: <1479500639.16973.3.camel@redhat.com>
On Fri, 2016-11-18 at 11:26 -0800, Stefano Stabellini wrote:
>
> I am no Xorg maintainer but back in the XenClient days we did some
> perf
> analysis and it turned out that the bitblt operations supported by
> Cirrus are actually very slow to emulate in QEMU.
Yep. Turns out the "acceleration" is still going to be running on a
CPU, so you can either take a hypercall for every operation, or not.
The X drivers for a while now have detected virtual cirrus devices and
defaulted to a shadow framebuffer instead, partly for this reason and
partly to hide the absolutely terrible 24bpp framebuffer format from
applications.
- ajax
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
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next parent reply other threads:[~2016-11-18 21:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1479500639.16973.3.camel@redhat.com>
2016-11-18 21:57 ` Dario Faggioli [this message]
[not found] <1479500348.16973.1.camel@redhat.com>
2016-11-18 21:57 ` [Fwd: Re: Wondering about cirris and stdvga] Dario Faggioli
2016-11-18 22:31 ` Dario Faggioli
[not found] <alpine.DEB.2.10.1611181123310.3290@sstabellini-ThinkPad-X260>
2016-11-18 21:57 ` Dario Faggioli
[not found] <20161118183224.GB10560@x230.dumpdata.com>
2016-11-18 21:57 ` Dario Faggioli
[not found] <22575.17337.627347.934459@mariner.uk.xensource.com>
2016-11-18 21:57 ` Dario Faggioli
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