RE: FW: [Xen-ia64-devel] Good projects for someone

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Magenheimer,Dan (HP Labs Fort Collins)
>Sent: 2006年1月14日 2:17
>To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Subject: FW: FW: [Xen-ia64-devel] Good projects for someone
>
>I just committed this patch from Tristan and it is now
>possible to re-enable and run with CONFIG_XEN_SMP (see
>xen/include/asm-ia64/config.h).  Thanks Tristan!
>
>I see lots of "pending guest timer before its due" messages,
>which I think are just indicating that without Kevin's
>timer fix, dom0 would freeze.  Kevin, is it OK to turn off this
>message now?  I am also seeing some Linux "Oops: timer tick
>before it's due" messages.

Yes, please turn it off the message. For linux Oops, it's yet to be root caused.

Thanks,
Kevin
>
>At some point we may want to enable CONFIG_XEN_SMP by
>default.  (It has been enabled by default on Xen/x86 for
>over a year.)
>
>Dan
>
>> -----Original Message-----
>> From: Tristan Gingold [mailto:Tristan.Gingold@xxxxxxxx]
>> Sent: Friday, January 13, 2006 6:34 AM
>> To: Magenheimer, Dan (HP Labs Fort Collins)
>> Subject: Re: FW: [Xen-ia64-devel] Good projects for someone
>>
>> Le Jeudi 12 Janvier 2006 23:05, Magenheimer, Dan (HP Labs
>> Fort Collins) a
>> écrit :
>> > > Le Vendredi 06 Janvier 2006 22:13, vous avez écrit :
>> > > > > 2) Turning CONFIG_SMP on doesn't currently work because
>> > > > > the (new) routine flush_tlb_mask is unimplemented and panics.
>> > > > > Once SMP is working again, perhaps we should turn it on
>> > > > > by default?
>> > > >
>> > > > Have you looked at this?  If it is easy to fix, it would
>> > > > be nice to get SMP working again...
>> > >
>> > > Not yet.
>> > >
>> > > It is currently difficult to me to work on SMP because I
>> > > don't have an ITP
>> > > (ie, the machine with an ITP is busy).
>> > > I'd plan to work on SMP as soon as I have the ITP.  We are
>> > > working on this ITP
>> > > issue.
>> > >
>> > > Maybe the new routine can be written and checked easily ? If
>> > > so I can work on
>> > > it now.
>> >
>> > I'm not sure.  It looks like the routine is doing an IPI to flush
>> > the TLB on one or more processors.  Some of the places where
>> > it is called may not apply on ia64.  It may not even be necessary
>> > at all (especially before we have SMP guests).  Or it likely
>> > will be rarely necessary, but when it IS necessary will result
>> > in a crash if it's not done correctly.
>> >
>> > How hard is it do an IPI to flush the TLB on another processor?
>> > If it's easy, we should probably just add the code to do it.
>> > If it's hard, we should look more carefully at the code to see
>> > exactly when it is necessary.
>> Humm, it is rather easy.  I should have looked on this issue before.
>>
>> Here is the patch.
>> Note: the signed-off-by line is included in the patch.  I
>> hope this is the
>> right place.
>>
>> Thanks.
>> See you next week.
>>
>> Tristan.
>>

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