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

To: "Yang, Fred" <fred.yang@xxxxxxxxx>, "Magenheimer, Dan \(HP Labs Fort Collins\)" <dan.magenheimer@xxxxxx>, <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: FW: [Xen-ia64-devel] Good projects for someone
From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date: Sun, 15 Jan 2006 12:52:05 +0800
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Thread-topic: FW: [Xen-ia64-devel] Good projects for someone
>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.
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. ;-)

>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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