From: "Michael S. Tsirkin" <mst@redhat.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
virtualization@lists.linux-foundation.org,
habanero@linux.vnet.ibm.com, Shirley Ma <mashirle@us.ibm.com>,
Krishna Kumar2 <krkumar2@in.ibm.com>,
kvm@vger.kernel.org, steved@us.ibm.com,
Tom Lendacky <tahm@linux.vnet.ibm.com>,
borntraeger@de.ibm.com, avi@redhat.com,
bryanv@daemoninthecloset.org
Subject: Re: [PATCHv3] virtio-spec: 64 bit features, used/avail event, fixes
Date: Wed, 3 Aug 2011 19:39:23 +0300 [thread overview]
Message-ID: <20110803163923.GA17244@redhat.com> (raw)
In-Reply-To: <4E397425.90808@redhat.com>
On Wed, Aug 03, 2011 at 06:15:33PM +0200, Gerd Hoffmann wrote:
> Hi,
>
> >E.g. with 32 bridges, and 32 devices behind each one,
> >the available 64K space gets us only 64 bytes per device.
>
> 15 bridges (with io window enabled) max, the smallest io window you
> can assign to a bridge is 4k, and you need some space for the
> devices on the root bus ...
>
> cheers,
> Gerd
Hmm, wait, we could go 32 bit, then we are not limited to 32
bridges anymore, right? Does our bios support that?
--
MST
next prev parent reply other threads:[~2011-08-03 16:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-01 10:25 [PATCHv3] virtio-spec: 64 bit features, used/avail event, fixes Michael S. Tsirkin
2011-06-02 1:49 ` Rusty Russell
2011-08-03 16:05 ` Michael S. Tsirkin
2011-08-03 16:15 ` Gerd Hoffmann
2011-08-03 16:29 ` Michael S. Tsirkin
2011-08-03 16:39 ` Michael S. Tsirkin [this message]
2011-08-04 7:55 ` Gerd Hoffmann
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