Server CPU usage spikes from networked acoounts

Hello all,
I work for a school district and we have recently switched the majority of our users to log in via network accounts (rather than mobile). At random times, the CPU on the server will spike to 100% usage and sometimes stays there for an hour or more. Running 'fs_usage' on the server reveals that certain files and/or dirs are getting hung. The main culprits seem to be Firefox v15 profiles, the AddressBook folder under Application Support, and Microsoft Office 2011 files. I'm wondering if anyone has seen these issues before, or know of something that could be done to alleviate the issue. Most of our clients are running Mac OS X 10.7.4. Our servers run Leopard. It also may be worth noting that many of the people logging in are doing so on laptops (macbook airs).
Thanks.

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Uncorrelated GC STW pauses in ParNew + sys cpu time spikes from jvm calls

Hi, JVM experts.
GC is not an easy subject to grab all its subtleties, so I'm looking for some advice with my situation where to dig further.
The overall picture:
1) Linux smp (2.6.5) x86_64 host with 8G memory, 2x2Ghz xeon (HT) CPUs
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_02-b05, mixed mode)
2) Heap: -Xms4500M -Xmx4500M -XX:MaxNewSize=128m -XX:NewSize=128m -XX:MaxPermSize=128m -XX:PermSize=128m
3) GC: -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:MaxTenuringThreshold=0 -XX:SurvivorRatio=128 -XX:CMSInitiatingOccupancyFraction=60 -XX:+UseCMSInitiatingOccupancyOnly -XX:+CMSParallelRemarkEnabled -XX:+DisableExplicitGC -XX:+PrintGCApplicationStoppedTime -XX:+PrintClassHistogram
4) Application is running under consistent traffic for two weeks.
5) I monitor the system with "sar"
6) Once or twice a week I observe the kernel-space cpu usage spike to ~90% for a duration <10 seconds.
7) I detect the cpu spike and dump a snapshot of the system situation. It's the JVM which consumes the syscpu time. JVM is sent SIGQUIT at the same instant.
There are two points, I'm rather vague about.
1) All cpu load situations have the following similar pattern in GC log file:
195098.019: [GC 195098.019: [ParNew
Desired survivor size 491520 bytes, new threshold 0 (max 0)
: 129152K->0K(130112K), 0.0754030 secs] 1549718K->1448253K(4607040K), 0.0755550 secs]
Total time for which application threads were stopped: 0.0758180 seconds
Application time: 0.5316910 seconds
Total time for which application threads were stopped: 0.0003550 seconds
Application time: 0.0695990 seconds
Total time for which application threads were stopped: 0.0001620 seconds
Application time: 0.1657730 seconds
Total time for which application threads were stopped: 0.0001780 seconds
Application time: 0.0000350 seconds
Total time for which application threads were stopped: 0.0000440 seconds
Application time: 0.2738210 seconds
Total time for which application threads were stopped: 0.0003530 seconds
Application time: 0.3108570 seconds
195099.448: [GC 195099.448: [ParNew
Desired survivor size 491520 bytes, new threshold 0 (max 0)
: 129151K->0K(130112K), 0.0712390 secs] 1577405K->1476947K(4607040K), 0.0713980 secs]
Total time for which application threads were stopped: 0.0716750 seconds
Application time: 0.0364560 seconds
Total time for which application threads were stopped: 8.2666520 seconds
Application time: 0.0000700 seconds
Total time for which application threads were stopped: 0.0055730 seconds
Application time: 0.0069140 seconds
Total time for which application threads were stopped: 0.0017350 seconds
Application time: 0.0011930 seconds
Total time for which application threads were stopped: 0.0064760 seconds
Application time: 0.0000720 seconds
Total time for which application threads were stopped: 0.0001120 seconds
Application time: 0.0001010 seconds
Total time for which application threads were stopped: 0.0000650 seconds
Application time: 0.0001570 seconds
195107.840: [Full GC 195107.840: [CMS: 1476947K->1092516K(4476928K), 7.6193100 secs] 1488921K->1092516K(4607040K), [CMS Perm : 46862K->46641K(131072K)], 7.6194800 secs]
num #instances #bytes class name
1: 1962568 306032400 [Ljava.util.HashMap$Entry;
2: 1962446 125596544 java.util.HashMap
The "delay" of the SIGQUIT/Histogram dump can be ~1-2 seconds from the CPU overload detection. I'm curious about the "suspeciously spurious" SWT preceding the cpu spike. What could be the possible reasons?
2) Per thread analysis of the JVM threads hinted me to one thread which sometimes monopolized ~60% of the cpu time in kernel space. This is the native posix thread which "calls back into" JVM on certain events. Could it somehow cause the aforementioned STW?
My attempts to get a gdb stack dump at cpu load event failed (gdb can't resolve the stack in some of the jvm threads and enters infinite loop)
Any advice is greatly appreciated
regards,
- andrey

Just to close my "ticket" with some findings on the way hopefully to be useful for somebody else.
Since the problem manifested itself only on Linux box (have tried two different enterprise production kernels 2.6), I couldn't use dtrace, so my choice was limited to systap and /proc/profile.
The pattern when cpu usage was spiking was the following:
15 get_stack 0.1042
31 unhandled_signal 0.6458
34 stub_rt_sigreturn 0.2297
49 copy_siginfo_to_user 0.1021
70 find_vma 0.6250
94 retint_signal 0.7705
100 do_sigaltstack 0.2604
138 is_prefetch 0.3920
211 __up_read 1.1989
252 system_call 1.9535
292 __down_read 1.9730
552 save_i387 2.8750
1501 do_page_fault 0.9381
2266 do_signal 1.3488
2427 get_signal_to_deliver 1.9700
2452 force_sig_info 11.7885
3715 sys_rt_sigreturn 5.1597
14260 total 0.0057
It has been always the extensive number of signals generated. systap is lacking dtace java probes (as well as any u-level probes for that matter), so I could tap only in the kernel on syscalls:
force_sig_info= 10209 – 10230
0xc043681b : force_sig_info+0x1/0x86
0xc04230d3 : force_sig_info_fault+0x24/0x28
0xc0404670 : sys_rt_sigreturn+0x0/0xff
0xc061e3d8 : kprobe_exceptions_notify+0x164/0x386
0xc061f043 : notifier_call_chain+0x2a/0x47
0xc061f07e : atomic_notifier_call_chain+0x17/0x1a
0xc061f011 : do_page_fault+0x5e7/0x5ef
0xc0400000 : startup_32+0x0/0xb4
sys_rt_sigreturn= 10209 – 10235
0xc0404671 : sys_rt_sigreturn+0x1/0xff
0xc040518a : syscall_call+0x7/0xb
0xc0400000 : startup_32+0x0/0xb4
sys_rt_sigreturn() is tricky (it is designed to return to the kernel from the u-space signal handler), but the force_sig_info() is the result of the do_page_fault(). The swap was disabled and I assumed that page faults were "minor"-s. Looking at the comments in the OpenJDK JVM sources I could see that there are cases for non-mapped regions singal handling (like dynamic stack growth), so I suspected it's something very JVM specific. I could not correlate it precisely to GC events.
The end of the story is that I didn't find out exactly what was the real trigger of this event, but JVM1.6.05 does not produce such CPU spilkes.
- a.

Simple Java 3D programs CPU Usage spikes to up to 90 percent!

Hi, everyone. Im completely new to Java 3D and Im toying around with basic program structure right now. My code is based off of that in the first chapter on 3D in Killer Game Programming in Java. I removed most of the scene elements, replacing them with a simple grid, Maya style. (Yes, Im starting off small, but my ambitions are grand I intend on creating a polygonal modeling and animation toolset. After all, the Maya PLE is dead damn you, Autodesk! and I just plain dislike Blender.) I implement a simple OrbitBehavior as a means for the user to navigate the scene. That part was basically copy and paste from Andrew Davisons code. The mystery, then, is why the programs framerate drops below 1 FPS and its CPU Usage spikes to up to 90 percent, according to the Task Manager, when I tumble the scene. Id appreciate anyone taking the time to look at the code and trying to identify the problem area. (Ive undoubtedly missed something totally newbish. -.-) Thank you!
(Also, I had the worst possible time wrestling with the posting process. Is anyone else having trouble editing their posts before submitting them?)
import java.awt.*;
import javax.swing.*;
public class MAFrame
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        catch (Exception e) {
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import com.sun.j3d.utils.behaviors.vp.*;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.universe.*;
import java.awt.*;
import javax.media.j3d.*;
import javax.swing.*;
import javax.vecmath.*;
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        background.setColor(0.17f, 0.65f, 0.92f);
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            lineArr.setCoordinate(index++, new Point3d (-offset + (count * GRID_SPACING), 0, -offset)); // ends far
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        vp.setViewPlatformBehavior(orbit);
}

Huh. A simple call to View.setMinimumFrameCycleTime() fixed the problem. How odd that there effectively is no default maximum framerate. Of course simple programs like these, rendered as many times as possible every second, are going to consume all possible CPU usage...

JDev 10.0.1.3 CPU Usage Spikes - Somewhat Serious!

I have noticed that JdevW.exe process in task menager has annoying CPU usage spikes every 2-3 seconds. This does NOT happen if I use 10.0.1.2 version.
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Shay,
I am actually not doing anything. As soon as I open JDev I can see (and feel) that performance problem. Every time the 'spike' occurs, mouse gets 'frozen' for a fraction of a second. It is anoying a bit.
My coworker's installation do not have that problem and I wonder if add-ons that I have downloaded and installed would create this behavior. BTW, how do I figure out what add-ons (plugins) I got?
I can see 'jucheck.exe' and 'jusched.exe' processes as well but even when I killed them the spikes occur.
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CPU Usage Spikes - Crashes ITunes

I've been using Itunes for about a year, and over the past week, my CPU usage will spike at 100% while playing Itunes, causing the song quality to skip and play as if it was a scratched CD. I updated from 4.9 to 5.0 (erasing all existing Itunes programs first) and the problem still happens. I'm not running anything else other than Itunes, and the usage still spikes to 100% causing the problem.
Please help!

I'm having the same problem. I've isolated it in a number of ways trying to resolve it.
It always happens 13 seconds into playing a track. This applies whether it plays from the beginning, 1 min into the track or if I make is jump to different places. Each time, once it has played 13 seconds (ie first 13 secs or if I jump to 1 min immediately it will be at 1:13 or if I play 6 secs then jump to 1:30 it will happen at 1:37). The CPU spikes to 100%, pausing everything and leaving a 3 or 4 sec silence.
This happens regardless of track length. So a 1 hour dj set will have the CPU spike at 13 secs and then be fine for the next hour.
It seems to me to be related to some sort of buffering or something similar in Itunes. I have worked out that once it has caused the CPU spike I can restart the same track and it will play through without a hiccup. If I play the next track and then come back to the first track, though, it will glitch at 13 secs again. I can also make it glitch on a replay of the first track without playing any others by changing the tracks that are to come after it in the playlist. This seems to suggest it is related to buffering the coming track(s).
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I have also bought a shuffle and would have probably run the software related to that. If you had a problem when you added a mini perhaps it's due to some sort of error arising from the software coming with new ipods when used with existing itunes installations? Just a guess.
I'm running Itunes 4.7.1.30. I had thought about upgrading to 5 but it seems to be causing more problems and it seems it doesn't resolve this one.
If anyone can help with this I would be most grateful as it is making Itunes unusable on my computer. I'm going to have to go back to playing cds!!!

Server CPU Usages - Critical

We have a BC4J application developed using jdev 3.1/ front end is JSPs.
The application is deployed using Oracle iAS 8i.
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amit

Howard,
because the CSS has a script language, you can basically do whatever you want.
You could have a script running on the server to get the server cpu and save it into a file.
Via the CSS script language, you could retrieve this value and decided to use or not the server.
There is also something called DFP - dynamic feedback protocol. If your server vendor support this protocol you can use it to report server status to the CSS.
Regards,
Gilles.

CPU usage spikes to 90%

Dear all,
I have 1 Pub, 2 Sub of version 8.0, when I looked into RTMT, I found increase in the CPU usage to 90%
Can any one guide how to solve and what is the reason for increase
I have 2600 ip phones

thanks for your comment
after entering the command
admin:show process using-most cpu
PCPU PID CPU NICE STATE CPUTIME ARGS
%CPU PID CPU NI S TIME COMMAND
7.5 28399 - 0 S 7-15:34:03 /home/tomcat/tomcat /home/tomcat/tomcatJlauncher Config.xml -Djava.library.path=/usr/local/lib:/usr/local/thirdparty/java/j2sdk/j re/lib/i386:/usr/local/thirdparty/java/j2sdk/jre/lib/i386/server:/usr/lib/pgsql: /usr/lib:/usr/local/cm/lib::/usr/local/platform/lib -XX:ErrorFile=/usr/local/thi rdparty/jakarta-tomcat/logs/diagnostic-info.jvm-crash.<pid>.tomcat.txt -XX:OnOut OfMemoryError=/home/tomcat/tomcat_diagnostics.sh -XX:OnError=/home/tomcat/tomcat _diagnostics.sh -Djavax.net.ssl.trustStore=/usr/local/platform/.security/tomcat/ trust-certs/tomcat-trust.keystore -Djavax.net.ssl.trustStorePassword=CFZLvtE9aAG PbFCD -Djavax.net.ssl.trustStoreType=PKCS12 -Djava.util.logging.manager=org.apac he.juli.ClassLoaderLogManager -Djava.util.logging.config.file=/usr/local/thirdpa rty/jakarta-tomcat/conf/logging.properties -Xmx640m -Xms256m -XX:MaxPermSize=256 m -Djava.endorsed.dirs=/usr/local/thirdparty/jakarta-tomcat/endorsed -classpath :/usr/local/thirdparty/java/bcprov-jdk15-138.jar:/usr/local/platform/jar/xalan.j ar:/usr/local/platform/jar/certMgmt.jar:/usr/local/platform/jar/certMonitor.jar: /usr/local/platform/jar/Iproduct.jar:/usr/local/platform/jar/Ihardware.jar:/usr/ local/platform/jar/CiscoIPSec.jar:/usr/local/platform/jar/ciscoCmd.jar:/usr/loca l/platform/jar/ciscoCommon.jar:/usr/local/platform/jar/platform-api.jar:/usr/loc al/platform/jar/maverick-all.jar:/common/download:/usr/local/platform/applicatio n_locale/platform-api:/usr/local/platform/application_locale/cmplatform:/usr/loc al/cm/jar/commons-logging.jar:/usr/local/platform/jar/xstream-1.1.2.jar:/usr/loc al/cm/jar/log4j-1.2.8.jar:/usr/local/cm/application_locale/cmservices:/usr/local /cm/application_locale/car:/usr/local/cm/application_locale/ccmadmin:/usr/local/ cm/application_locale/ccmuser:/usr/local/cm/application_locale:/usr/local/thirdp arty/jakarta-tomcat/bin/bootstrap.jar -Djava.security.manager -Djava.security.po licy==/usr/local/thirdparty/jakarta-tomcat/conf/catalina.policy -Dcatalina.base= /usr/local/thirdparty/jakarta-tomcat -Dcatalina.home=/usr/local/thirdparty/jakar ta-tomcat -Djava.io.tmpdir=/usr/local/thirdparty/jakarta-tomcat/temp start
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Help with regular cpu usage spike

im running a VI thats reading data off a mouse through a VISA driver. i get these strange spikes in cpu usage which are regular at ~12-13 second intervals, which i haven't got a clue as to the cause.
any ideas??
Attachments:
cpu spike.jpg ‏73 KB

hi all,
thanks for the suggestions. ive looked with sysinternals, and it appears to be a very minor increase in labview cpu usage - i closed all antivirus related processes, and the spike still continues, so it doesn't appear to be that...
ive attached the vi, in case its some stupid coding issue..
apologies for being so ignorant, but how would i go about checking if it's some issue caused by a windows update or whatnot..
Attachments:
mouse_reader_no_output.vi ‏44 KB

CPU Usage Spikes

My computer was not responding well when I tried to install a driver for my webcam. The error message said that I should try uninstalling some recently installed programs. So I did. There were some that were recently installed but I didn't really known what they were. Since they were recently installed, I didn't think they were necessary. Ever since last night, my computer has been spiking up and down in CPU usage and I don't know what to do. I am not sure if it has to do with the recently uninstalled programs. If so? I don't know which ones I uninstalled to fix the problem. What can I do? Please help!!!!

Please give us some helpful information..
Which model computer is this?
Which Windows does it run?
Which programs are you talking about?
When you give us an error message, quote it precisely on a line all by itself. Paraphrasing doesn't help. We don't care what the message means. We want just the string of characters. Spelling counts.
-Jerry

USB Audio device - CPU usage spikes - w520

I have a LENOVO W520 4276CTO
Intel Core i7 @ 2.40GHz
8.00 GB Dual-Channel DDR3 @ 664MHz
Whenever a USB Audio device is enabled I am experiencing cpu spikes every 8 seconds approx.
This activity happens with 2 different usb audio devices from 2 different vendors.
I have used various tools to try and track the problem down such as latency checkers
LatencyMon indicates a large amount of ISR and DPC activity on the
usbport.sys driver
i've been trying to resolve this problem for weeks now and would appreciate any help .
Thanks
Glenn

What USB controller are you using? Not saying it will address your issue but there is a driver update for the Renesas controller (2.1.32.0). When I installed it I had to manually update the driver.
For your USB devices, are you using their latest drivers?
You may also want to review kb2529073 to check whether the kb is applicable to you.
I have played around with a USB external audio device in a dynadock (Toshiba) and no DPC issues but an issue with not being able to run 'Smart Audio' in cpl. The message is 'Failed to initialize smart audio'. So I have to use the system utilities to control the Conexant audio. Have you noticed any issues with the onboard audio tools and your external audio device?
You may also wish to check the Microsoft site for any Win 7 USB related hotfixes that may help.

CPU usage spikes while viewing webpage with java script

Can anyone tell me if it is normal for cpu use to spike up to 90% when I view a webpage that's using javascript? It is a scrolling news headline using java script 1.2 in the webpage.
Thanks

Fortunately, while my temps do go up and fan speed increases, mine does not become exceedingly loud. I apparently have a lot of good karma stored up because both the original midplane and its replacement - bad caps - have had quiet fans.

DNS server process, high CPU usage

Hello,
I am having a problem with high CPU usage on DNS process. We have 1921 setup in network of about 100 workstations that use it as DNS server. It also performs split view functionality for couple of domains in order to avoid hairpin NAT. I know that a router is not fit for heavy server duty but such setup was unfortunately necessary.
In peak work hours we oftenly have CPU hitting 100% with DNS server process being the root cause,and on several occasions we had DNS process stuck in such state for prolonged periods of time during which other router functions were affected (t's a default gateway, IPsec concentrator etc.). Sometimes shutting the process and restarting it would solve the problem, but once it required a full reload in order to restore functionality (such was the description that engineer on duty reported to me).
Forwarder queue statistics:
Current size = 0
Maximum size = 86
Drops        = 0
IOS upgrade did not help, we are currently running 15.2(2)T.
The question is ... is such behaviour (CPU load) to be expected on LAN with 100 workstations due to slow CPU on router or we have bugged IOS DNS server (requiring a TAC case)?
The previous solution seem to do this functionality quite nicely (even though it was also a router), so I am not inclined to think that we are dealing with someone DoS-ing the DNS (WAN access to DNS is of course forbidden)
P.S.
Since we moved servers off the routers DNS, we do not receive complaints, but we had a couple of unresolved messages a day while mail server was using router for DNS. I am suspecting that an old bug where IOS DNS servers occasionaly sends clients back empty DNS replies (properly formatted message but without A record) could be still around?

hi,
i have the same problem on UC540 and 2911 on IOS 15.0.1. CPU high, router crashed. Reboot helps but until CPU usage spikes again. the only fix is to remove "ip dns server" from config and use a different DNS server
                    111                       1111    1111111111
          999999999900077777777799999777778888000099990000000000
    322222111119999900077776666622222111119999000088880000000000
100            ********                       ******************
90       *************         *****     **********************
80       ***************************     **********************
70       ******************************************************
60       ******************************************************
50       ******************************************************
40       ******************************************************
30       ******************************************************
20       ******************************************************
10       ******************************************************
   0....5....1....1....2....2....3....3....4....4....5....5....6
             0    5    0    5    0    5    0    5    0    5    0
               CPU% per second (last 60 seconds)
after removed IP dns server
                                       111
                             99999999990007777777779999977777888
              33333333332222211111999990007777666662222211111999
100                               ********
90                          *************         *****     ***
80                          ***************************     ***
70                          ***********************************
60                          ***********************************
50                          ***********************************
40                          ***********************************
30                          ***********************************
20                          ***********************************
10                          ***********************************
   0....5....1....1....2....2....3....3....4....4....5....5....6
             0    5    0    5    0    5    0    5    0    5    0
               CPU% per second (last 60 seconds)

Help me understanding server memory usage

I am trying to determine how much memory our weblogic server needs and
am seeing what seems to me to be strange memory growth patterns in the
server. I am running weblogic6.1sp4(with CR093850) on solaris 2.7.
I have written an emulator for testing performance and stability of
our system. The emulator has sleeps in it between actions so it is
emulating a real end user interaction with the system, it is not
trying to emulate a super heavy load.
I configured weblogic server to have a high max heap to begin with(1.5
gig) and thought I could turn 10 emulators on and let them run for a
while to get all my entity bean cached filled up, then I could see
what the size of my server was at that point and expect that to be
close to what it will need. Is this an appropriate way to determine
size?
However, when I do this and try to let my emulators run for 24 hours,
I never make it past 13 hours. The weblogic server never stops
growing and of course I eventually end up with all the emulators
exiting with 'out of memory' errors from the server.
The process grows slowly at first, even seems pretty well behaved for
the first 2-4 hours. Then the process size starts to grow a little
more rapidly, then there is some drastic up and downs then eventually
it just stays high. During the spikes the CPU usage spikes as well
even though the load from my emulators has not increased.
If our code had a small memory leak I would expect to see a steady,
constant slow growth problem, but that is not whats happening, it
starts out small growth but then becomes more spiky.
I have max-beans-in-cache and max-beans-in-free-pool said reasonably
low on my entity beans that are used in this test. There are only 8
entity bean types being used in this test run. 1 stateful session
bean type and 3 stateless session beans.
Has anyone else seen this odd behavior? Has anyone had success in
setting a reasonable heap size?
any insight would be greatly appreciated!
Kelly

Hi Kelly,
That looks pretty much like a memory leak. You could use a memory
profiler like OptimizeIt, or at least search though the code for
appearances of static public Hashtable
- that's where ever-growing "caches" live.
Regards,
Slava Imeshev
"Kelly Kingdon" <[email protected]> wrote in message
news:[email protected]...
I am trying to determine how much memory our weblogic server needs and
am seeing what seems to me to be strange memory growth patterns in the
server. I am running weblogic6.1sp4(with CR093850) on solaris 2.7.
I have written an emulator for testing performance and stability of
our system. The emulator has sleeps in it between actions so it is
emulating a real end user interaction with the system, it is not
trying to emulate a super heavy load.
I configured weblogic server to have a high max heap to begin with(1.5
gig) and thought I could turn 10 emulators on and let them run for a
while to get all my entity bean cached filled up, then I could see
what the size of my server was at that point and expect that to be
close to what it will need. Is this an appropriate way to determine
size?
However, when I do this and try to let my emulators run for 24 hours,
I never make it past 13 hours. The weblogic server never stops
growing and of course I eventually end up with all the emulators
exiting with 'out of memory' errors from the server.
The process grows slowly at first, even seems pretty well behaved for
the first 2-4 hours. Then the process size starts to grow a little
more rapidly, then there is some drastic up and downs then eventually
it just stays high. During the spikes the CPU usage spikes as well
even though the load from my emulators has not increased.
If our code had a small memory leak I would expect to see a steady,
constant slow growth problem, but that is not whats happening, it
starts out small growth but then becomes more spiky.
I have max-beans-in-cache and max-beans-in-free-pool said reasonably
low on my entity beans that are used in this test. There are only 8
entity bean types being used in this test run. 1 stateful session
bean type and 3 stateless session beans.
Has anyone else seen this odd behavior? Has anyone had success in
setting a reasonable heap size?
any insight would be greatly appreciated!
Kelly

RV220W port forwarding an 99% CPU usage

Hi,
I made a custom port forward using tcp ports 2121-2130 to a private IP address on my network (192.168.1.8). Whenever I do this, RV220W CPU usage spikes to 98-99% and my Internet connection starts lagging a lot. Just disabling the port forward from the administation console fixes this. I'm running the latest firmware.

Taneli,
There is a problem with port forwarding in RV220W please read the release notes for 1.0.3.5 for work arounds
Jasbryan

Xorg + xf86-video-intel lags with compiz / high cpu usage without it

I have recently noticed that my X server lags. It happens approximately once per second (it's fairly regular) and it can be easily observed when watching movies, dragging windows or rotating cube. Screen just hangs for some milliseconds. Lags are bigger and happens more often when many windows are opened.
Even worse things happen when I'm _not_ running compiz. X's cpu usage spikes permanently up to 30-40% and lags are even more noticable.
My hardware:
Laptop with Intel GMA 950
Configuration
I tried some different xorg.confs but it seems to be irrevelant. It happens even on plain conf created by 'Xorg -configure'
xorg-server 1.5.3-3
mesa 7.2-1
xf86-video-intel 2.4.3-1
kernel26 2.6.27.8-1
I also tried downgrading these packages to
xorg-server 1.4.2-2
mesa 7.0.3-3
xf86-video-intel 2.3.2-1
kernel26 2.6.27-1
and it seems to resolve cpu usage problem but not the lags.
Does anybody know what might cause these lags? It's really annoying.

It turned out that color depth was the issue. I think that 24bit is too big for my graphics card and compiz (although I remember that i810+24bit+compiz worked fine).
So changing DefaultDepth in xorg.conf to 16 fixed the problem. Is there any other way to workaround this without decreasing color depth?

Server CPU usage spikes from networked acoounts

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