From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Load increase after memory upgrade (part2)
Date: Tue, 10 Jan 2012 16:55:33 -0500
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To: Konrad Rzeszutek Wilk <konrad@darnok.org>
Cc: xen-devel <xen-devel@lists.xensource.com>, Ian Campbell <ian.campbell@citrix.com>, lersek@redhat.com, zhenzhong.duan@oracle.com, Sander Eikelenboom <linux@eikelenboom.it>, Carsten Schiers <carsten@schiers.de>
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On Mon, Dec 19, 2011 at 10:56:09AM -0400, Konrad Rzeszutek Wilk wrote:
> On Sun, Dec 18, 2011 at 01:19:16AM +0100, Sander Eikelenboom wrote:
> > I also have done some experiments with the patch, in domU i also get the 0% full for my usb controllers with video grabbers , in dom0 my i get 12% full, both my realtek 8169 ethernet controllers seem to use the bounce buffering ...
> > And that with a iommu (amd) ? it all seems kind of strange, although it is also working ...
> > I'm not having much time now, hoping to get back with a full report soon.
> 
> Hm, so domU nothing, but dom0 it reports. Maybe the patch is incorrect
> when running as PV guest .. Will look in more details after the
> holidays. Thanks for being willing to try it out.

Good news is I am able to reproduce this with my 32-bit NIC with 3.2 domU:

[  771.896140] SWIOTLB is 11% full
[  776.896116] 0 [e1000 0000:00:00.0] bounce: from:222028(slow:0)to:2 map:222037 unmap:227220 sync:0
[  776.896126] 1 [e1000 0000:00:00.0] bounce: from:0(slow:0)to:5188 map:5188 unmap:0 sync:0
[  776.896133] 3 [e1000 0000:00:00.0] bounce: from:0(slow:0)to:1 map:1 unmap:0 sync:0

but interestingly enough, if I boot the guest as the first one I do not get these bounce
requests. I will shortly bootup a Xen-O-Linux kernel and see if I get these same
numbers.