[Xen-users] Configuration XEN for Realtime application

[Kamy <massmailing@xxxxxxxxxxx>]

We wanna use XEN to provide GameServer Hosting and MMorpg Hosting on our 
server on dual xeon 2.8Ghz with 3GB of ram on gentoo system with XEN 
3.0.2 on 2.6.16.28-r1 patched kernel and Gentoo on DOMU.
We have a lot of problem with this kind of realtime application.
for example Counter Strike Source server engine or L2J (java emulation 
of lineage 2 server) is too laggy to rent a good server. On the same 
machine with plain gentoo distribution we have no problem, but on 
Xen-Gentoo system we have a lot of lag problems.
L2J configuration example:
xm list
Name                              ID     Mem(MiB)     VCPUs State      
Time(s)
Domain-0                        0       125                
4                         r----- 50825.6
airin                                 3       1600              
2                         ------ 154591.2
hallate                              4       1300              2         
               r----- 83373.9
(airin and hallate provide 2 different L2J server)

xm sched-sedf
Name                              ID     Period(ms)     Slice(ms)     
Lat(ms)     Extra     Weight
Domain-0                        0       100.0             
95.0            0.0            0           2
airin                                 3       100.0             
38.0            0.0            0           4
hallate                              4       100.0             
63.3            0.0            0           4

xentop - 12:24:54   Xen 3.0.2
3 domains: 1 running, 2 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 3145256k total, 3131212k used, 14044k free    CPUs: 4 @ 2791MHz
     NAME          STATE       CPU(sec) CPU(%)     MEM(k)    MEM(%)  
MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) SSID
     Domain-0      -----r          50833       3.6             
128152      4.1            no limit             n/a                    
4            8         3113564    1421358    0
VCPUs(sec):   0:      50069s  1:        145s  2:        100s  3:        517s
    airin                -----r          154640     20.7           
1638076    52.1         1638400           52.1                 
2            2         6385002    4695512    0
VCPUs(sec):   0:      93581s  1:      61058s
  hallate              ------           83399      10.6            
1330868   42.3          1331200          42.3                  2         
 2          5087847    3616569    0
VCPUs(sec):   0:      49536s  1:      33863s

I try to lock airin on first 2 cpu and hallate on the second 2, but any 
changes on xentop. On this example u must remember this 2 virtual L2J 
server provide an MMORPG server for 400 people connected on the same of 
AVERAGE... so u can undestand how is heavy and realtime for server!
We wanna work with this beatiful application for virtualizzation but in 
this time we can't do it for this strange problem.
Any suggestions or questions?

Regards & many thanks for any help!
Luca Camillo
Play.it

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