[Xen-users] xen 2.0.7 on SuSE 9.3 very slow responses in dom0

[Dirk Estreng <dirk.estreng@xxxxxx>]

Hi there,

I downgraded my machine from xen3 to xen 2.0.7 on suse93 due to several problems
with xen3/suse 10.0 

Now I experience massive performance degradation in dom0 while installing domUs.
It seems like "some" network OR disk IO is just slowing down dom0. There aren´t
yet any domUs running I just install them in LVM lv´s.

Running on an AMD Sempron 2600
2 GB RAM
80 GB ATA harddisk with UDMA on
Using suse 9.3 with xen 2.0.7 from Kurt Garloff
DomU on LVM

It seems to me like the machine totally looses interactive response while
copying or transfering files. Where to start looking? Is it a xen/dom0 problem
or is it due to hardware problems? Or is it something like a "sheduler" limiting
dom0 performance?

How to find the bottleneck? I tried sysstat but don´t know how to interpret the
values...

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

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
hda              20.60         6.40      2227.20         32      11136
hdc               0.00         0.00         0.00          0          0

avg-cpu:  %user   %nice    %sys %iowait   %idle
          68.80    0.00   19.80   11.40    0.00

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
hda              38.00        49.60      4137.60        248      20688
hdc               0.00         0.00         0.00          0          0

avg-cpu:  %user   %nice    %sys %iowait   %idle
          55.40    0.00   20.60   24.00    0.00

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
hda              23.20        62.40      8096.00        312      40480
hdc               0.00         0.00         0.00          0          0

avg-cpu:  %user   %nice    %sys %iowait   %idle
           4.00    0.00    6.00   90.00    0.00

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
hda              38.80         6.40       803.20         32       4016
hdc               0.00         0.00         0.00          0          0

avg-cpu:  %user   %nice    %sys %iowait   %idle
          30.60    0.00   21.40   48.00    0.00

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
hda              63.40       604.80      1217.60       3024       6088
hdc               0.00         0.00         0.00          0          0

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

Thanks
Dirk


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