From: Paolo Bonzini <pbonzini@redhat.com>
To: Tim Deegan <tim@xen.org>
Cc: James Harper <james.harper@bendigoit.com.au>,
xen-devel@lists.xensource.com
Subject: Re: Re: improving VNC performance
Date: Tue, 26 Jul 2011 10:33:29 +0200 [thread overview]
Message-ID: <4E2E7BD9.6050309@redhat.com> (raw)
In-Reply-To: <20110726082716.GA29346@ocelot.phlegethon.org>
On 07/26/2011 10:27 AM, Tim Deegan wrote:
> At 08:45 +0200 on 26 Jul (1311669952), Paolo Bonzini wrote:
>> On 07/26/2011 04:00 AM, James Harper wrote:
>>> It would be really nice to be able to cut&paste (would require a
>>> userspace app), and to fake some accelerator functions (eg block moves).
>>
>> Block moves are accelerated if you use the Cirrus VGA. Nothing else is,
>> though. :)
>
> Actually we found that it's faster to turn that acceleration off, since
> it's not really accelerated --- it'll be a memcpy either in domU or in
> qemu, and you might as well skip the (slow, synchronous) emulated
> register writes that domU would use to drive the blitter.
Yes, it's slower but saves bandwidth. It depends on your use case.
Paolo
next prev parent reply other threads:[~2011-07-26 8:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-26 2:00 improving VNC performance James Harper
2011-07-26 2:22 ` Todd Deshane
2011-07-26 9:17 ` Pasi Kärkkäinen
2011-07-26 10:54 ` James Harper
2011-07-26 6:45 ` Paolo Bonzini
2011-07-26 8:27 ` Tim Deegan
2011-07-26 8:33 ` Paolo Bonzini [this message]
2011-07-26 10:52 ` James Harper
2011-07-26 8:44 ` Jean Guyader
2011-07-26 9:53 ` Jean Guyader
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