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Re: Poor Xorg performance in Etch

Douglas A. Tutty wrote:

On Sun, Aug 19, 2007 at 10:42:22AM -0400, Marty wrote:

Douglas A. Tutty wrote:
>On Sun, Aug 19, 2007 at 09:04:13AM -0400, Marty wrote:
> >
>>>New observations after further testing: First, I think I was mistaken, >>and >this problem does not occur in my other Etch system. Secondly, top >>shows >only one CPU pegged at 100%, while the overall CPU utilization is >>50%, >suggesting that the other CPU is idle. Taken together these seem >>to >suggest a possible SMP or motherboard issue (MSI K9MM-V). 
>>
>>I posted too soon. Apparently the image setting had not taken hold, and >>when I did disable it the problem went away, both in Iceape and >>Konqueror. This seems odd because the page is mostly text, with only a >>few small images. Now I am guessing there is some kind of image library >>issue. 
>
>Just to clarify what you're seeing in top: 0.0%wa ?
I'm not sure I understand myself. I stopped it while scrolling and copied the first few lines below: 

Tasks: 126 total,   2 running, 124 sleeping,   0 stopped,   0 zombie
Cpu(s): 49.9%us, 4.8%sy, 0.0%ni, 45.1%id, 0.2%wa, 0.0%hi, 0.0%si, 0.0%st 

You have the (1) toggle on so that all CPUs are aggregated into Cpu(s).
Turn off the toggle to get a separate line for each CPU.  According to
this your system is idle about half the time.  I suspect that one
processor (the one running Xorg) is going flat out and the other is
idle.  I don't know if Xorg is multi-threaded and able to run on
multiple CPUs or single threaded where SMP doesn't help.  Hopefully, the
application can use the other CPU to spread the load.



Mem:   2073092k total,  1917620k used,   155472k free,    18832k buffers
Swap:  6434024k total,        0k used,  6434024k free,  1631596k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 3353 root      15 -10 98128  24m 6460 R  100  1.2  10:36.02 Xorg



If you have Irix mode set, then Xorg is using 100% of the CPU on which
it is running.  If you have Solaris mode set, then Xorg is using 100% of
all CPUs, for the time period since the last refresh.

Doug.
Thanks. I also found the threads option (H) in the man page. Below is a more complete top listing, with (1) and Irix mode off, and threads on. It shows only about one third of the total number of tasks. 

Tasks: 173 total,   4 running, 169 sleeping,   0 stopped,   0 zombie
Cpu0  :  1.0%us,  0.0%sy,  0.0%ni, 99.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Cpu1  :100.0%us,  0.0%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   2073092k total,  2020192k used,    52900k free,     3976k buffers
Swap:  6434024k total,       56k used,  6433968k free,  1536972k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 3353 root      14 -10  103m  33m 6608 R 49.9  1.6  15:35.94 Xorg
32185 marty     16   0  307m 249m  22m S  0.3 12.3   1:16.70 iceape-bin
32483 marty     16   0  2228 1172  856 S  0.2  0.1   0:04.79 top
    1 root      16   0  1948  644  552 S  0.0  0.0   0:24.81 init
    2 root      RT   0     0    0    0 S  0.0  0.0   0:00.02 migration/0
    3 root      34  19     0    0    0 S  0.0  0.0   0:00.03 ksoftirqd/0
    4 root      RT   0     0    0    0 S  0.0  0.0   0:00.38 migration/1
    5 root      34  19     0    0    0 S  0.0  0.0   0:00.01 ksoftirqd/1
    6 root      10  -5     0    0    0 S  0.0  0.0   0:00.10 events/0
    7 root      10  -5     0    0    0 S  0.0  0.0   0:00.40 events/1
    8 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 khelper
    9 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 kthread
   12 root      10  -5     0    0    0 S  0.0  0.0   0:00.21 kblockd/0
   13 root      10  -5     0    0    0 S  0.0  0.0   0:00.01 kblockd/1
   14 root      13  -5     0    0    0 S  0.0  0.0   0:00.00 kacpid
  105 root      10  -5     0    0    0 S  0.0  0.0   0:00.02 khubd
  107 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 kseriod
  234 root      20   0     0    0    0 S  0.0  0.0   0:00.00 pdflush
  235 root      15   0     0    0    0 S  0.0  0.0   0:00.03 pdflush
  236 root      15   0     0    0    0 S  0.0  0.0   0:00.54 kswapd0
  237 root      13  -5     0    0    0 S  0.0  0.0   0:00.00 aio/0
  238 root      13  -5     0    0    0 S  0.0  0.0   0:00.00 aio/1
  360 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 ata/0
  361 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 ata/1
  363 root      11  -5     0    0    0 S  0.0  0.0   0:00.00 scsi_eh_0
  364 root      11  -5     0    0    0 S  0.0  0.0   0:00.00 scsi_eh_1
  404 root      11  -5     0    0    0 S  0.0  0.0   0:00.00 scsi_eh_2
  405 root      10  -5     0    0    0 S  0.0  0.0   0:00.04 usb-storage
  420 root      11  -5     0    0    0 S  0.0  0.0   0:00.00 kpsmoused
  483 root      15   0     0    0    0 S  0.0  0.0   0:00.00 kirqd
  603 root      16  -4  2708 1152  348 S  0.0  0.1   0:00.03 udevd
  950 root      12  -5     0    0    0 S  0.0  0.0   0:00.00 ivtv_vbi/0
  951 root      12  -5     0    0    0 S  0.0  0.0   0:00.00 ivtv_vbi/1
  998 root       5 -10     0    0    0 S  0.0  0.0   1:11.84 ivtv-enc
  999 root       5 -10     0    0    0 S  0.0  0.0   5:43.70 ivtv-enc-vbi
 1000 root      11  -5     0    0    0 S  0.0  0.0   0:00.00 ivtv_vbi/0
 1001 root      10  -5     0    0    0 S  0.0  0.0   0:00.00 ivtv_vbi/1
 1034 root      10 -10     0    0    0 S  0.0  0.0   0:00.00 ivtv-enc
 1035 root      10 -10     0    0    0 S  0.0  0.0   0:00.00 ivtv-enc-vbi
 2080 daemon    16   0  1684  364  272 S  0.0  0.0   0:00.00 portmap
 2083 root      11  -5     0    0    0 S  0.0  0.0   0:00.00 rpciod/0
 2084 root      11  -5     0    0    0 S  0.0  0.0   0:00.00 rpciod/1
 2085 root      18   0     0    0    0 S  0.0  0.0   0:00.00 lockd
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