[pve-devel] ballon initializing bug

[Alexandre DERUMIER]

>>maybe this fix is related 

>>virtio: update balloon size in balloon "probe" 
>>https://github.com/torvalds/linux/commit/8424af5336b34043a705d66bdf2c1428048ef085


>>fix a bug introduced in kernel 4.6

>>I'll do test tomorrow

Ok, I confirm you that it's fixing the bug.

So maybe warn user that balloon can be wrong initilizated with guest kernel 4.6, 4.7, 4.8.
(not sure if it'll be backported officialy)


----- Mail original -----
De: "aderumier" <aderumier at odiso.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mercredi 16 Novembre 2016 18:54:14
Objet: Re: [pve-devel] ballon initializing bug

maybe this fix is related 

virtio: update balloon size in balloon "probe" 
https://github.com/torvalds/linux/commit/8424af5336b34043a705d66bdf2c1428048ef085 


fix a bug introduced in kernel 4.6 

I'll do test tomorrow 

----- Mail original ----- 
De: "aderumier" <aderumier at odiso.com> 
À: "pve-devel" <pve-devel at pve.proxmox.com> 
Envoyé: Mercredi 16 Novembre 2016 17:43:03 
Objet: Re: [pve-devel] ballon initializing bug 

adding a sleep seem to fix it. (execute the balloon command when guest driver is already loaded) 


if (!$statefile && (!defined($conf->{balloon}) || $conf->{balloon})) { 
+ sleep 30; 
vm_mon_cmd_nocheck($vmid, "balloon", value => $conf->{balloon}*1024*1024) 
if $conf->{balloon}; 
} 


Seem to be related to guest kernel. 

guest kernel 3.16 works fine, guest kernel 4.7,4.8 don't see the value at start. (maybe balloon driver don't read the value at boot) 


----- Mail original ----- 
De: "aderumier" <aderumier at odiso.com> 
À: "pve-devel" <pve-devel at pve.proxmox.com> 
Envoyé: Mercredi 16 Novembre 2016 16:59:25 
Objet: [pve-devel] ballon initializing bug 

Hi, 

I have detected something strange with ballooning and qemu 2.7 and 2.6.2 (not sure about old version). 
maybe it's a recent proxmox update ? 


vmid.conf 
--------- 
memory: 16384 
shares: 0 
balloon: 4096 


at start, qmp command seem to be sent the qmp command 

{ 
'arguments' => { 
'value' => 4294967296 
}, 
'execute' => 'balloon' 
}; 


but info balloon give me: 

# info balloon 
balloon: actual=16384 max_mem=16384 total_mem=16049 free_mem=15913 mem_swapped_in=0 mem_swapped_out=0 major_page_faults=255 minor_page_faults=62558 last_update=1479311697 



Then if I set manually in monitor: 

# balloon 4096 
# info balloon 
balloon: actual=4096 max_mem=16384 total_mem=4317 free_mem=3956 mem_swapped_in=0 mem_swapped_out=0 major_page_faults=964 minor_page_faults=205397 last_update=1479311871 
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