Re: [Xen-devel] Poor performance with Linux 3.x as dom0

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 2 May 2012, Ian Campbell wrote:
> On Wed, 2012-05-02 at 14:11 +0100, Andreas Kinzler wrote:
> > Hello Jeremy + Konrad + all kernel devs,
> > 
> > while it is great to see that vanilla dom0 seems to work, the 
> > performance breakdown compared to xenified 2.6.34 (from opensuse) is 
> > huge. Here are my benchmarks:
> 
> There were a couple of performance fixes posted recently, one of them
> was "xen: correctly check for pending events when restoring irq flags"
> from David Vrabel, which is now in mainline as 7eb7ce4d2e89 and marked
> for stable backport. The other was something to do with blk i/o
> performance from Stefano Stabellini which I don't have a handy reference
> too or status on (hopefully Konrad does though).

It is this one:

http://marc.info/?l=xen-devel&m=133526478318742&w=2

but it is only relevant if you are running the benchmark in a VM, with
the disk image stored in a file.

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