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mort23
n00b
Joined: 03 Apr 2004
Posts: 39
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 Posted: Sat Apr 03, 2004 3:09 pm Post subject: Lack with 3D Acceleration |
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Hi all 
I just switched from Debian to Gentoo. So far everything works great, except for my Games /emulated & native).
When I run a game, I'm getting a great framerate, like I'm used to. The problem: It runs for 2 secs with that great framerate, then it goes down to zero FPS for a half second or so and then it's going up again. That situation is repeating all the time. That is very annoying. It stucks all two seconds...
My Hardware: NVidia GeForce 4600 TI with an AthlonXP. Im running the emerged 5336 nvidia drivers. | Code: | | ACCEPT_KEYWORDS="~x86" emerge nvidia-kernel nvidia-glx |
I though this could be an hdd related problem, but:
| Code: |
hdparm -it /dev/hda
/dev/hda:
Model=Maxtor 6Y160P0, FwRev=YAR41VW0, SerialNo=Y60E8XBE
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
BuffType=DualPortCache, BuffSize=7936kB, MaxMultSect=16, MultSect=off
CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=268435455
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=yes: disabled (255) WriteCache=enabled
Drive conforms to: (null):
* signifies the current active mode
Timing buffered disk reads: 90 MB in 3.11 seconds = 28.92 MB/sec |
Well, with Debian I had something with 40mb/s, but I don't think those 10mb matter that much. I'm also using the same X-Config like I used in Debian, and almost the same kernel config.
Any ideas on this?
Mort |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54308
Location: 56N 3W
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| Posted: Sat Apr 03, 2004 3:32 pm Post subject: |
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mort23,
Two ideas,
1. You have not selected the best kernel scheduler when you compiled your kernel.
2. Try setting the nice factor for X to a negative number. You need to be root to do this. Try values between -1 and -10.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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mort23
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Joined: 03 Apr 2004
Posts: 39
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| Posted: Sat Apr 03, 2004 3:53 pm Post subject: |
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I had absoluteley no Idea what a kernel scheduler is. I googled a bit and figured it out, but how do I change that? Do I have to hack kernel/sched.c from the kernel-source-tree? Is there any documetation out there?
Also, I don't know what the nice factor for X is and how to change it. Some documentation for this would also be great.
Thanks for your help! |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54308
Location: 56N 3W
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| Posted: Sat Apr 03, 2004 4:15 pm Post subject: |
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mort23,
No kernel hacking is required. Its a Kernel configuration option when you run make menuconfig (or make xconfig). To play with this, you need to rebuild your kernel.
The default nice factor for a task is 0. When you make the nice more positive, the task does not get scheduled for a slice of CPU time as often, when you make the nice negative, the task competes more agressively for CPU time. Toy can play with nive on the fly with top.
Run top as the root user, make a note of the ProcessID of X and type r (for renice). top will ask for the PID then the new nice value.
You will see other things running at -10.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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mort23
n00b
Joined: 03 Apr 2004
Posts: 39
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| Posted: Sat Apr 03, 2004 4:56 pm Post subject: |
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I tried that renice thing. Going to negative number doesn't seem to change anything, but going positive makes it much worse.
| Code: | CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_AS=y
CONFIG_IOSCHED_DEADLINE=y
# CONFIG_NET_SCHED is not set |
That's all I could find in my kernel config containing the word "SCHED". Do you mean that? How could this be possible? My debian kernel config is the same, and I hadn't those problems with it. Are you shure this is a kernel thing? |
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W
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| Posted: Sat Apr 03, 2004 5:44 pm Post subject: |
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mort23,
No. Thats not it. Those options only appear if you choose Embedded. It looks like my info is out of date, googling shows that the scheduler improvements went into the main kerenl tree early in 2.5
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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Riftwing
Apprentice
Joined: 06 Oct 2002
Posts: 293
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| Posted: Sat Apr 03, 2004 7:19 pm Post subject: |
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J'm pretty sure that you just need to pass a line to the kernel to change scedulers during boot (grub or lilo).
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Good, bad, I'm the guy with the gun. - Ash, Army of Darkness |
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mort23
n00b
Joined: 03 Apr 2004
Posts: 39
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| Posted: Sat Apr 03, 2004 7:34 pm Post subject: |
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| I'm confused. Why do I need to boot with some parameters to enable some kind of kernel scheduling? On another distribution this worked just fine with the same kernel. What makes gentoo need that extra stuff? |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54308
Location: 56N 3W
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| Posted: Sat Apr 03, 2004 7:45 pm Post subject: |
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mort23,
Not all distros are equal. Some have patches applied that others don't, then the options settings vary too.
Gentoo has a range of different kernels aimed at different jogs.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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Moled
l33t
Joined: 09 Jul 2003
Posts: 635
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| Posted: Sat Apr 03, 2004 9:45 pm Post subject: |
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"elevator=xxxxxx"
the default is as |
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mort23
n00b
Joined: 03 Apr 2004
Posts: 39
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| Posted: Sun Apr 04, 2004 2:35 pm Post subject: Problem Solved |
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I tried all kind of Stuff until I figured out that gDesklets kills my performance! More precisely it's the gDesklets display "SysInfo". That display looks all two seconds for system stats, like CPU load, memory, etc.
I hadn't those problems with Debian because I was unable to get gDesklets to work there.
Thanks a lot for your friendly support! |
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