From: Avi Kivity <avi@redhat.com>
To: John Williams <john.williams@xilinx.com>
Cc: Peter Maydell <peter.maydell@linaro.org>,
"Edgar E. Iglesias" <edgar.iglesias@gmail.com>,
John Williams <jwilliams@xilinx.com>,
"qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>,
Peter Crosthwaite <pcrost@xilinx.com>
Subject: Re: [Qemu-devel] [RFC] Memory API and fine grained Memory Regions
Date: Mon, 29 Oct 2012 18:34:37 +0200 [thread overview]
Message-ID: <508EB01D.5010608@redhat.com> (raw)
In-Reply-To: <ac93a283-e426-462e-8057-8428492ece78@VA3EHSMHS018.ehs.local>
On 10/29/2012 01:37 AM, John Williams wrote:
>> IMO, an mr per reg would just add a massive overhead for no win.
>
> I tend to agree with Edgar here - QEMU has a careful line to walk between being an emulator and an RTL simulator.
>
> Any WAG on the runtime overhead of a mem region per register vs a switch-based decodes in read/write handlers?
>
Actually a region-per-register can be faster, since the subpage logic
will dispatch the access directly to the handler, instead of going first
to the device handler, then following the switch.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2012-10-29 16:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-26 7:03 [Qemu-devel] [RFC] Memory API and fine grained Memory Regions Peter Crosthwaite
2012-10-26 7:31 ` Gerd Hoffmann
2012-10-27 4:12 ` Edgar E. Iglesias
2012-10-28 23:37 ` John Williams
2012-10-29 16:34 ` Avi Kivity [this message]
2012-10-30 8:35 ` Edgar E. Iglesias
2012-10-29 16:36 ` Avi Kivity
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