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xen-users
[Xen-users] xend laggggg!
I'm having odd issues with xend. Here is my current setup
Dual Xeon with HT enabled, 8GB of ram, 3ware 9550 controller in a raid 10
config with 6 300GB drives. Dom0/U and Hypervisor all build with PAE
enabled. I started 40 DomU's with 128MB of ram running ttylinux off a LVM
(seperate LVM per domU). All of the DomU's are in a blocked state and CPU
time on all of them is under 0.5... so they are basically all IDLE.
Now for the problem, i first noticed that xm list was a bit slow and
discovered that it was taking about 3-5 seconds to display output. I
decided to play with xm vcpu-pin and set all 4 dom0 vcpu's to cpu0, xm
vcpu-list took over 5 minutes to run! I then decided to pin all of dom0's
vcpu's to cpu1 since all the domU's where using only 1 and 3. A xm
vcpu-list then made the box unresponsive, i didnt have a serial in it and
the monitor wouldnt wake up so i couldnt get a output (if it panic'd).
Rebooted, this time trying to see if leaving domU on all cpu's changed
anything, and now it only took 15ish seconds.. Next i tryed setting all
domU's to cpu 3 and all Dom0 cpu's to 1 and xm vcpu-list then took 2
minutes... Last i booted dom0 with the maxcpus=1 and now dom0 only see's 1
cpu (hypervisor i assume see's only 1 also because it doesnt assign guests
to any other cpu but 0 and i cant pin them either) got the same results,
very slow!
also shutting down 40 guests creates a ton of child processes of xend... :)
================== TEST 1 =============================
[root@localhost testing]# time xm vcpu-list
Name ID VCPU CPU State Time(s) CPU
Affinity
Domain-0 0 0 0 -b- 108.2 0
Domain-0 0 1 0 -b- 118.9 0
Domain-0 0 2 0 -b- 34.4 0
Domain-0 0 3 0 r-- 52.3 0
vps1 1 0 3 -b- 0.3 any cpu
vps2 2 0 1 -b- 0.4 any cpu
vps3 3 0 3 -b- 0.3 any cpu
vps4 4 0 1 -b- 0.4 any cpu
vps5 5 0 3 -b- 0.4 any cpu
vps6 6 0 1 -b- 0.3 any cpu
vps7 7 0 3 -b- 0.3 any cpu
vps8 8 0 1 -b- 0.3 any cpu
vps9 9 0 3 -b- 0.4 any cpu
vps10 10 0 1 -b- 0.3 any cpu
vps11 11 0 3 -b- 0.4 any cpu
vps12 12 0 1 -b- 0.4 any cpu
vps13 13 0 3 -b- 0.3 any cpu
vps14 14 0 1 -b- 0.4 any cpu
vps15 15 0 3 -b- 0.4 any cpu
vps16 16 0 1 -b- 0.3 any cpu
vps17 17 0 3 -b- 0.3 any cpu
vps18 18 0 1 -b- 0.4 any cpu
vps19 19 0 3 -b- 0.2 any cpu
vps20 20 0 1 -b- 0.4 any cpu
vps21 21 0 3 -b- 0.4 any cpu
vps22 22 0 1 -b- 0.3 any cpu
vps23 23 0 3 -b- 0.4 any cpu
vps24 24 0 1 -b- 0.3 any cpu
vps25 25 0 3 -b- 0.4 any cpu
vps26 26 0 1 -b- 0.4 any cpu
vps27 27 0 3 -b- 0.4 any cpu
vps28 28 0 1 -b- 0.4 any cpu
vps29 29 0 3 -b- 0.3 any cpu
vps30 30 0 1 -b- 0.3 any cpu
vps31 31 0 3 -b- 0.4 any cpu
vps32 32 0 1 -b- 0.4 any cpu
vps33 33 0 3 -b- 0.2 any cpu
vps34 34 0 1 -b- 0.3 any cpu
vps35 35 0 3 -b- 0.4 any cpu
vps36 36 0 1 -b- 0.3 any cpu
vps37 37 0 3 -b- 0.3 any cpu
vps38 38 0 1 -b- 0.3 any cpu
vps39 39 0 3 -b- 0.3 any cpu
real 4m26.345s
user 0m1.170s
sys 0m0.080s
========================= TEST 2 =====================
[root@localhost testing]# time xm list
Name ID Mem(MiB) VCPUs State Time(s)
Domain-0 0 500 1 r----- 128.2
vps1 1 128 1 -b---- 0.2
vps2 2 128 1 -b---- 0.2
vps3 3 128 1 -b---- 0.2
vps4 4 128 1 ------ 0.2
vps5 5 128 1 -b---- 0.2
vps6 6 128 1 -b---- 0.2
vps7 7 128 1 -b---- 0.2
vps8 8 128 1 -b---- 0.2
vps9 9 128 1 ------ 0.2
vps10 10 128 1 -b---- 0.2
vps11 11 128 1 -b---- 0.2
vps13 13 128 1 ------ 0.2
vps14 14 128 1 -b---- 0.2
vps15 15 128 1 -b---- 0.2
vps16 16 128 1 -b---- 0.2
vps17 17 128 1 -b---- 0.2
vps18 18 128 1 ------ 0.2
vps19 19 128 1 -b---- 0.2
vps20 20 128 1 -b---- 0.2
vps21 21 128 1 -b---- 0.2
vps22 22 128 1 -b---- 0.2
vps23 23 128 1 ------ 0.2
vps24 24 128 1 ------ 0.2
vps25 25 128 1 -b---- 0.2
vps26 26 128 1 -b---- 0.2
vps27 27 128 1 -b---- 0.2
vps28 28 128 1 -b---- 0.2
vps29 29 128 1 -b---- 0.2
vps30 30 128 1 -b---- 0.2
vps31 31 128 1 -b---- 0.3
vps32 32 128 1 -b---- 0.3
vps33 33 128 1 -b---- 0.2
vps34 34 128 1 -b---- 0.2
vps35 35 128 1 ------ 0.2
vps36 36 128 1 ------ 0.2
vps37 37 128 1 -b---- 0.2
vps38 38 128 1 -b---- 0.2
vps40 40 128 1 ------ 0.2
vps39 41 128 1 -b---- 0.4
vps12 42 128 1 -b---- 0.4
real 0m2.748s
user 0m0.520s
sys 0m0.010s
[root@localhost testing]#
Thanks!
--
~Shaun
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