Re: [Xen-users] DomU sees only 512MB RAM with PCI-passthrough

[Christian Holpert <christian@xxxxxxxxxx>]

Hello Ian,

At 10:38 13.12.2012, you wrote:
> On Wed, 2012-12-12 at 17:04 +0000, Christian Holpert wrote:
> > Please tell me, if you need more logs.
>
> dmesg of the guest booting both with and without the pci device might be
> interesting. So would the output of "xl -vvv create" in both cases.
attached.

> Is the 512MB number coming only from within the guest or is it also
> visible in e.g. xl list?
with pci:
xen xen # xl list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  2557     4     r-----    2928.2
nodi                                        27   512     3     r-----      34.1

--------------

without pci:
xen xen # xl list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  2557     4     r-----    2953.2
nodi                                        28  2048     3     -b----       0.6

> You could try ballooning up inside the guest,
> by writing to the /sys/devices/system/xen_memory/xen_memory0/target_kb
> sysfs node.
(with pci:)
No effect. sysfs already shows 2GB, but is ignored for values above 512MB.

nodi ~ # cat /sys/devices/system/xen_memory/xen_memory0/target_kb
2097152
nodi ~ # cat /proc/meminfo
MemTotal:         511268 kB
MemFree:          266328 kB
Buffers:           16572 kB
Cached:           152604 kB
SwapCached:            0 kB
Active:            65400 kB
Inactive:         157904 kB
Active(anon):      54180 kB
Inactive(anon):      332 kB
Active(file):      11220 kB
Inactive(file):   157572 kB
Unevictable:           0 kB
Mlocked:               0 kB
HighTotal:             0 kB
HighFree:              0 kB
LowTotal:         511268 kB
LowFree:          266328 kB
SwapTotal:        983036 kB
SwapFree:         983036 kB
Dirty:                 0 kB
Writeback:             0 kB
AnonPages:         54208 kB
Mapped:            33852 kB
Shmem:               388 kB
Slab:               8552 kB
SReclaimable:       3284 kB
SUnreclaim:         5268 kB
KernelStack:         760 kB
PageTables:         1076 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1238668 kB
Committed_AS:     237812 kB
VmallocTotal:     339960 kB
VmallocUsed:        7816 kB
VmallocChunk:     331464 kB
DirectMap4k:      524288 kB
DirectMap2M:           0 kB
nodi ~ # echo 1048576 > /sys/devices/system/xen_memory/xen_memory0/target_kb
nodi ~ # cat /sys/devices/system/xen_memory/xen_memory0/target_kb
1048576
nodi ~ # cat /proc/meminfo
MemTotal:         511268 kB
MemFree:          242920 kB
Buffers:           16580 kB
[...]

I was able to change to values below 512MB though. So the interface 
is working at least.
> Lastly you should try a more recent domU kernel.
today all tests above done with 3.6.6-gentoo.
Tried 2.6.38 and 3.4.11 yesterday.

Thanks for taking time,
Christian


--
Markt-Apotheke Christian Holpert e.K., Mömbris
  http://www.marktapotheke.org - info@xxxxxxxxxxxxxxxxx
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  Apotheker Christian Holpert
Im Markthof 5
63776 Mömbris
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Amtsgericht Aschaffenburg, HR.A, Registernummer 2165

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