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

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

>From: Yang, Fred
>Sent: 2006年1月14日 2:31
>
>"Oops!" message from Domain0 with CONFIG_XEN_SMP is always there but yet to
>root cause it.
>The message should be left as is to encourge community to root cause it.
>
>-Fred
>
Hi, Fred,
        Agree that Ooops message from domain0 is definitely bug which needs to 
be tracked down. I think the message to be turned off by Dan is the debug 
information in Xen which I added to see whether previous fix working. So it 
should be safe to do for the latter. ;-)

Thanks,
Kevin
>Magenheimer, Dan (HP Labs Fort Collins) wrote:
>> 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.
>>
>> 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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