RE: [GIT/PATCH 0/5] Re: [Xen-devel] unfair servicing of DomU vbd requests

[MaoXiaoyun <tinnycloud@xxxxxxxxxxx>]

Hi James.
 
I go through the patch, since all its changes happens inside __xen_evtchn_do_upcall(),
so I apply the patch into my 2.6.31.kernel by manual. (I was failed to merge a usable,
2.6.38dom0, since quite a lot branch needed, such as blkback, netback)
 
But still, the blue screen shows up. Log attached.
Is the timeout better than before?
 
Beside, I think I need find some to examine my harddisk.  

 
> Subject: FW: [GIT/PATCH 0/5] Re: [Xen-devel] unfair servicing of DomU vbd requests
> Date: Fri, 4 Mar 2011 09:26:44 +1100
> From: james.harper@xxxxxxxxxxxxxxxx
> To: tinnycloud@xxxxxxxxxxx
>
> Ian has posted some patches to xen-devel. Can you apply them to your Dom0 kernel and see if they fix your i/o servicing problem?
>
> As I understand it, without this patch Dom0 will service the lowest event channel first, so if there is always an io request on the lower channel the higher channels will never get serviced. A bad disk would aggravate this situation but isn't really the cause of it.
>
> James
>
> > -----Original Message-----
> > From: Ian Campbell [mailto:Ian.Campbell@xxxxxxxxxx]
> > Sent: Friday, 4 March 2011 04:10
> > To: Keir Fraser
> > Cc: James Harper; xen devel; Konrad Rzeszutek Wilk; Jeremy Fitzhardinge
> > Subject: [GIT/PATCH 0/5] Re: [Xen-deve l] unfair servicing of DomU vbd requests
> >
> > On Thu, 2011-03-03 at 08:30 +0000, Keir Fraser wrote:
> > > Without the round-robin servicing, unfairness to the point of starvation is
> > > a distinct possibility.
> >
> > Indeed. The following is a forward port of these patches from
> > 2.6.18-xen.hg:
> > * 324:7fe1c6d02a2b
> > * 325:b2768401db94
> > * 988:c88a02a22a05
> > * 990:427276ac595d
> > * 991:9ba6d9f3fbc0
> >
> > Hopefully I didn't miss any.
> >
> > The switch in pvops from "l1"/"l2" naming convention to "word"/"bit"
> > made the conflict resolution a bit prone to thinkos but hopefully I
> > didn't b0rk it too badly. Review with that in mind greatly appreciated.
> >
> > boots a dom0 + a pv guest.
> >
> > Pull request on top of konrad/stable/irq.cleanup:
> ; >
> > The following changes since commit c5ae07bb307b658c8458f29ca77d237aec0f9327:
> > Ian Campbell (1):
> > xen: events: remove dom0 specific xen_create_msi_irq
> >
> > are available in the git repository at:
> >
> > git://xenbits.xen.org/people/ianc/linux-2.6.git irq-fairness
> >
> > Ian Campbell (1):
> > xen: events: Make last processed event channel a per-cpu variable.
> >
> > Keir Fraser (3):
> > xen: events: Clean up round-robin evtchn scan.
> > xen: events: Make round-robin scan fairer by snapshotting each l2 word
> > xen: events: Remove redundant clear of l2i at end of round-robin loop
> >
> > Scott Rixner (1):
> > xen: events: Process event channels notifications in round-robin order.
> >
> > drivers/xen/events.c | 80 +++++++++++++++++++++++++++++++++++++++++++++----
> > ; -
> > 1 files changed, 72 insertions(+), 8 deletions(-)
> >
> >
> >
> > Ian.
> >
> >
> >
>

Attachment: qemu-dm-w3.MR_cp7.vhd.log
Description: Text document

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