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From: Gerd Hoffmann <kraxel@redhat.com>
To: "Michael S. Tsirkin" <mst@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, 03 Aug 2011 18:15:33 +0200	[thread overview]
Message-ID: <4E397425.90808@redhat.com> (raw)
In-Reply-To: <20110803160518.GA16563@redhat.com>

   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


  parent reply	other threads:[~2011-08-03 16:16 UTC|newest]

Thread overview: 14+ 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 16:05   ` Michael S. Tsirkin
2011-08-03 16:15     ` Gerd Hoffmann
2011-08-03 16:15     ` Gerd Hoffmann [this message]
2011-08-03 16:29       ` Michael S. Tsirkin
2011-08-03 16:29       ` Michael S. Tsirkin
2011-08-03 16:39       ` Michael S. Tsirkin
2011-08-03 16:39       ` Michael S. Tsirkin
2011-08-04  7:55         ` Gerd Hoffmann
2011-08-04  7:55         ` Gerd Hoffmann
2011-06-02  1:49 ` Rusty Russell
  -- strict thread matches above, loose matches on Subject: below --
2011-06-01 10:25 Michael S. Tsirkin

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