From: Fabio Fantoni <fantonifabio@tiscali.it>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>,
Ian Campbell <Ian.Campbell@citrix.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v3] tools/libxl: Improve videoram setting
Date: Fri, 01 Feb 2013 12:52:05 +0100 [thread overview]
Message-ID: <510BAC65.7080505@tiscali.it> (raw)
In-Reply-To: <alpine.DEB.2.02.1301141818360.4978@kaball.uk.xensource.com>
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Il 14/01/2013 19:21, Stefano Stabellini ha scritto:
> I did a quick test and it seems that it should be possible to change
> the amount of videoram for stdvga too using the same command line
> option, however at the moment it just errors out. Therefore I am OK
> with this patch only taking care of Cirrus for the moment.
I found details about stdvga on qemu upstream:
http://xenbits.xen.org/gitweb/?p=staging/qemu-upstream-unstable.git;a=blob_plain;f=docs/specs/standard-vga.txt;hb=HEAD
It seems that stdvga memory by default is 16 mb, while xen reserves only
8 mb by default and doen't logs any error.
For cirrus, increasing memory seems to be correct and without error with
my patch.
WIth both cirrus and stdvga under qemu upstream with xen the performance
are really poor even if I increase video memory, respect to qemu-only
and qemu-kvm (without xen).
Qxl is definitely not working under xen and conversely is ok on qemu-kvm
and qemu-only.
It seem that xen need change and/or fix to have full working emulated
vga on qemu upstream.
At the moment all emulated vgas have problems with xen that aren't
present without xen.
The performance differences are noticeable (in some case very big) with
xen and without xen using resolution > 1024x768.
Probably the first link explain the change/fix necessary in xen about
vga (probably in hvmloader).
I tried to do that more times failing but unfortunately I do not have
sufficient knowledge about this.
Can someone help me please?
I think this is important, years ago the minimal resolution used on
desktop was 1024x768, and no problem with actual vga setting but now
minimal resolution seems increased to up 1366x768 and many people are
using even higher resolutions.
http://www.screenresolution.org/year-2013/
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From: Fabio Fantoni <fantonifabio@tiscali.it>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>,
Ian Campbell <Ian.Campbell@citrix.com>,
qemu-devel@nongnu.org
Subject: Re: [PATCH v3] tools/libxl: Improve videoram setting
Date: Fri, 01 Feb 2013 12:52:05 +0100 [thread overview]
Message-ID: <510BAC65.7080505@tiscali.it> (raw)
In-Reply-To: <alpine.DEB.2.02.1301141818360.4978@kaball.uk.xensource.com>
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Il 14/01/2013 19:21, Stefano Stabellini ha scritto:
> I did a quick test and it seems that it should be possible to change
> the amount of videoram for stdvga too using the same command line
> option, however at the moment it just errors out. Therefore I am OK
> with this patch only taking care of Cirrus for the moment.
I found details about stdvga on qemu upstream:
http://xenbits.xen.org/gitweb/?p=staging/qemu-upstream-unstable.git;a=blob_plain;f=docs/specs/standard-vga.txt;hb=HEAD
It seems that stdvga memory by default is 16 mb, while xen reserves only
8 mb by default and doen't logs any error.
For cirrus, increasing memory seems to be correct and without error with
my patch.
WIth both cirrus and stdvga under qemu upstream with xen the performance
are really poor even if I increase video memory, respect to qemu-only
and qemu-kvm (without xen).
Qxl is definitely not working under xen and conversely is ok on qemu-kvm
and qemu-only.
It seem that xen need change and/or fix to have full working emulated
vga on qemu upstream.
At the moment all emulated vgas have problems with xen that aren't
present without xen.
The performance differences are noticeable (in some case very big) with
xen and without xen using resolution > 1024x768.
Probably the first link explain the change/fix necessary in xen about
vga (probably in hvmloader).
I tried to do that more times failing but unfortunately I do not have
sufficient knowledge about this.
Can someone help me please?
I think this is important, years ago the minimal resolution used on
desktop was 1024x768, and no problem with actual vga setting but now
minimal resolution seems increased to up 1366x768 and many people are
using even higher resolutions.
http://www.screenresolution.org/year-2013/
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next prev parent reply other threads:[~2013-02-01 11:52 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-11 15:59 [PATCH v3] tools/libxl: Improve videoram setting Fabio Fantoni
2013-01-14 12:49 ` Stefano Stabellini
2013-01-14 14:25 ` Fabio Fantoni
2013-01-14 18:21 ` Stefano Stabellini
2013-01-15 15:03 ` Fabio Fantoni
2013-01-15 16:05 ` Stefano Stabellini
2013-01-15 16:10 ` Ian Campbell
2013-02-01 11:52 ` Fabio Fantoni [this message]
2013-02-01 11:52 ` Fabio Fantoni
2013-02-07 15:42 ` Trolle Selander
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