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From: Juan Quintela <quintela@redhat.com>
In-Reply-To: <4CF55D3E.5010400@codemonkey.ws> (Anthony Liguori's message of
	"Tue, 30 Nov 2010 14:23:26 -0600")
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Date: Tue, 30 Nov 2010 21:56:29 +0100
Message-ID: <m3mxoqpm2q.fsf@trasno.mitica>
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Subject: [Qemu-devel] Re: [PATCH 02/10] Add buffered_file_internal constant
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: qemu-devel@nongnu.org, "Michael S. Tsirkin" <mst@redhat.com>

Anthony Liguori <anthony@codemonkey.ws> wrote:
> On 11/30/2010 01:15 PM, Juan Quintela wrote:

>>>> At the end of the ram_save_live().  This was the reason that I put the
>>>> information there.
>>>>
>>>> for the 24mins stall (I don't have that machine anymore) I had less
>>>> "exact" measurements.  It was the amount that it "decided" to sent in
>>>> the last non-live part of memory migration.  With the stalls&   zero page
>>>> account, we just got to the point where we had basically infinity speed.
>>>>
>>>>        
>>> That's not quite guest visible.
>>>      
>> Humm, guest don't answer in 24mins
>> monitor don't answer in 24mins
>> ping don't answer in 24mins
>>
>> are you sure that this is not visible?  Bug report put that guest had
>> just died, it was me who waited to see that it took 24mins to end.
>>    
>
> I'm extremely sceptical that any of your patches would address this
> problem.  Even if you had to scan every page in a 400GB guest, it
> would not take 24 minutes.   Something is not quite right here.
>
> 24 minutes suggests that there's another problem that is yet to be
> identified.

I haven't tested the lastest versions of the patches sent to the list,
but a previous version fixed that problem.

If I get my hands on the machine will try to reproduce the problem and
measure things.

Later, Juan.