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Old 09-15-2010, 05:49 PM
Gerald Turner
 
Default Disable smartpoll netfront option in Xen flavour?

Ian Campbell <ijc@hellion.org.uk> writes:

> Bastian,
>
> I think we should pull the changesets which make smart poll optional
> and then disable it by default into the squeeze kernel. What do you
> think?
>
> I presume it is preferred to pull the individual changesets at this
> stage rather than rebasing to a newer xen.git? (I can do either if you
> like)
>

BTW, I opened bug #596635 about this last Sunday, probably prematurely.

> On Tue, 2010-09-14 at 19:44 +0100, Pasi Kärkkäinen wrote:
>> On Tue, Sep 14, 2010 at 10:54:27AM -0700, Jeremy Fitzhardinge wrote:
>> > On 09/14/2010 01:25 AM, Ian Campbell wrote:
>> > > On Mon, 2010-09-13 at 20:36 +0100, Jeremy Fitzhardinge wrote:
>> > >> On 09/13/2010 09:08 AM, Pasi Kärkkäinen wrote:
>> > >>> On Mon, Sep 13, 2010 at 09:01:57AM -0700, Gerald Turner wrote:
>> > >>>> Then I restarted all domUs with use_smartpoll=0 and haven't
>> > >>>> had any lockups in 7 hours.
>> > >>>>
>> > >>> I think we should default xen/stable-2.6.32.x to
>> > >>> use_smartpoll=0 for the time being until this is sorted out..
>> > >> Agreed.
>> > > Should we also consider adding a netback option to disable it for
>> > > the system as a whole as well? Or are the issues strictly
>> > > in-guest only?
>> > >
>> > > Perhaps netback should support a xenstore key to allow a
>> > > toolstack to configure this property per guest?
>> >
>> > It depends on what the problem is. If there's a basic problem with
>> > the smartpoll front<->back communication protocol then we'll
>> > probably have to revert the whole thing and start over. If the bug
>> > is just something in the frontend then we can disable it there
>> > until resolved.
>> >
>> > Fortunately I haven't pushed netfront smartpoll support upstream
>> > yet, so the userbase is still fairly limited. I hope.
>> >
>>
>> There has been quite a few people on ##xen on irc complaining about
>> it..
>>
>> I think the smartpoll code has ended up in Debian Squeeze
>> 2.6.32-5-xen kernel.. Hopefully they'll pull the "Revert
>> "xen/netfront: default smartpoll to on"" soon..
>>
>> -- Pasi
>>

--
Gerald Turner Email: gturner@unzane.com JID: gturner@jabber.unzane.com
GPG: 0xFA8CD6D5 21D9 B2E8 7FE7 F19E 5F7D 4D0C 3FA0 810F FA8C D6D5


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