Intel G41 graphics are slow while memory runs in dual channel mode.

Vans vans9 at
Tue Dec 21 13:00:29 UTC 2010

Hi, again.

I've forgot to mention that I had vm.pmap.pg_ps_enabled enabled. So, I've tried various combinations of hw.physmem and vm.pmap.pg_ps_enabled. No valuable result, only a bit smoother graphics with the superpages disabled. So I think there is no reason possibly to continue testing various settings, because I have a bit customized setup: a bit customized kernel; xf86-video-intel, libdrm compiled with gcc45, not the system default one... And each can be the cause of such behavior. So, I consider upgrading to amd64. But... If you you have any more recipes to try with i386 system, I'll try them.


17.12.2010, в 18:39, Gary Jennejohn <gljennjohn at> написал(а):

> On Fri, 17 Dec 2010 17:15:34 +0300
> N V <VaNs9 at> wrote:
>> Hello.
>> I have Compaq 500B with "Pentium(R) Dual-Core  CPU      E5300  @ 2.60GHz (2600.02-MHz 686-class CPU)."
>> Video card is:
>> %pciconf -lv | grep -i g41
>>    device     = 'Intel G41 express graphics (PCIVEN_8086&DEV_2E32&SUBSYS_31031565&REV_033&115)'
>> %grep -i intel /var/log/Xorg.0.log | head
>> (--) PCI:*(0:0:2:0) 8086:2e32:103c:2a8c Intel Corporation 4 Series Chipset Integrated Graphics Controller rev 3, Mem @ 0xfe400000/4194304, 0xd0000000/268435456, I/O @ 0x0000dc00/8, BIOS @ 0x????????/65536
>> (II) LoadModule: "intel"
>> (II) Loading /usr/local/lib/xorg/modules/drivers/
>> (II) Module intel: vendor="X.Org Foundation"
>> (II) intel: Driver for Intel Integrated Graphics Chipsets: i810,
>>        Mobile Intel® GM45 Express Chipset,
>>        Intel Integrated Graphics Device, G45/G43, Q45/Q43, G41
>> (==) intel(0): Depth 24, (--) framebuffer bpp 32
>> (==) intel(0): RGB weight 888
>> The system is:
>> %uname -mor
>> FreeBSD 8.2-PRERELEASE i386
>> There were 2GBs of memory running in single channel (one slot occupied). Everything was ok.
>> I've added 2 more GBs (occuping the second slot). Now memory runs in dual channel. I have 4GBs. The system is i386, non-PAE, so ~3GBs are visible.
>> I have latest KDE that is built from ports.
>> And the problem: after adding memory, graphics (compositing, I think) became so slow rendering the effects, that after a second or less of some "desktop effect" KDE turns off desktop effects. XvMC is enabled in xorg.conf, if it matters.
> I doubt this has anything to do with dual-channel memory.  More likely
> is that you're trying to use 4GiB with i386, which can cause all kinds
> of problems.
> You have two options, as fas as I can tell
> 1) run amd64, which can use the full 4GiB of memory
> 2) set hm.physmem to 3G (or maybe a little more) in /boot/loader.conf
> -- 
> Gary Jennejohn

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