Hi,
I have pretty much this exact same fault with Ubuntu Gusty, as soon as a
client (another Ubuntu Gusty machine) connects to the server, Xorg uses
near 100% CPU and performance is terrible - the server machine grinds to
a halt, and the client machine's remote desktop is sluggish.
The machines are two laptops, the "server" simply grinds to a halt as
soon as the "client" connects via vncviewer.
The problem defintely appears related to vino-server : As soon as it
starts handling a client request, the Xorg CPU utilization goes through
the roof.
Here is before/after top :
BEFORE :
top - 22:07:37 up 4:04, 3 users, load average: 0.08, 0.04, 0.15
Tasks: 104 total, 2 running, 102 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 450300k total, 439256k used, 11044k free, 4368k buffers
Swap: 859436k total, 34704k used, 824732k free, 258032k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 15 0 2952 1852 532 S 0.0 0.4 0:01.57 init
2 root 14 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0
4 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
5 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
6 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/0
7 root 10 -5 0 0 0 S 0.0 0.0 0:00.02 khelper
26 root 10 -5 0 0 0 S 0.0 0.0 0:00.12 kblockd/0
27 root 10 -5 0 0 0 S 0.0 0.0 0:01.86 kacpid
28 root 10 -5 0 0 0 S 0.0 0.0 0:00.03 kacpi_notify
111 root 11 -5 0 0 0 S 0.0 0.0 0:00.01 kseriod
128 root 15 0 0 0 0 S 0.0 0.0 0:00.04 pdflush
129 root 15 0 0 0 0 S 0.0 0.0 0:00.49 pdflush
130 root 10 -5 0 0 0 S 0.0 0.0 0:00.78 kswapd0
181 root 11 -5 0 0 0 S 0.0 0.0 0:00.00 aio/0
2029 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 ksuspend_usbd
2030 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 khubd
AFTER client connection with vncviewer (top run on server)
top - 22:10:06 up 4:07, 3 users, load average: 0.31, 0.10, 0.15
Tasks: 104 total, 4 running, 100 sleeping, 0 stopped, 0 zombie
Cpu(s): 63.1%us, 14.6%sy, 0.0%ni, 19.6%id, 0.0%wa, 1.0%hi, 1.7%si, 0.0%st
Mem: 450300k total, 436764k used, 13536k free, 4440k buffers
Swap: 859436k total, 34704k used, 824732k free, 258156k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4982 root 16 0 191m 30m 7232 R 64.8 6.8 54:28.34 Xorg
15658 steveh 15 0 32736 10m 6112 S 14.3 2.5 1:54.88 vino-server
16087 steveh 15 0 2368 1148 876 R 0.3 0.3 0:00.09 top
1 root 15 0 2952 1852 532 S 0.0 0.4 0:01.57 init
2 root 14 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0
4 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
5 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
6 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/0
7 root 10 -5 0 0 0 S 0.0 0.0 0:00.02 khelper
26 root 10 -5 0 0 0 S 0.0 0.0 0:00.12 kblockd/0
27 root 10 -5 0 0 0 S 0.0 0.0 0:01.87 kacpid
28 root 10 -5 0 0 0 S 0.0 0.0 0:00.03 kacpi_notify
111 root 11 -5 0 0 0 S 0.0 0.0 0:00.01 kseriod
128 root 15 0 0 0 0 S 0.0 0.0 0:00.04 pdflush
129 root 15 0 0 0 0 S 0.0 0.0 0:00.49 pdflush
130 root 10 -5 0 0 0 S 0.0 0.0 0:00.78 kswapd0
Can I try anything else to help debug this?
--
when vino is running for several hours, performance degrades, making xorg to
eat up cpu usage
https://bugs.launchpad.net/bugs/125179
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