Sloooooow RHEL 3 system with 1GB memory 2005-01-22 - By ebrown@(protected)
Back
I've experienced the same on a laptop with 1GB memory. It doesn't appear
to be an RHEL3 problem, it occurs also with 2.4 and 2.6 kernels in Fedora.
Passing 'mem=896M' as a parameter on the kernel line in grub.conf is a
workaround (avoids HIGHMEM allocation).
FWIW, /proc/mtrr doesn't indicate any uncachable RAM. Here it is (while
running a 2.6.6 kernel on FC1):
reg00: base=0x00000000 ( 0MB), size= 512MB: write-back, count=1
reg01: base=0x20000000 ( 512MB), size= 256MB: write-back, count=1
reg02: base=0x30000000 ( 768MB), size= 128MB: write-back, count=1
reg03: base=0x38000000 ( 896MB), size= 64MB: write-back, count=1
reg04: base=0x3c000000 ( 960MB), size= 32MB: write-back, count=1
reg05: base=0x3e000000 ( 992MB), size= 16MB: write-back, count=1
reg06: base=0xf0000000 (3840MB), size= 4MB: write-combining, count=1
-Ed
> We have just installed RHEL 3 on a Server with the following
> configuration:
>
> P4 3.4Gh
> Intel 915GEV Motherboard
> Dual 73Gb, U320 SCSI, 10k rpm disks
> 1Gb of dual chanel DDR2 533Mhz memory (matched pair of 512Mb sticks)
>
> Hyperthreading is enabled. Kernel is 2.4.21-4.ELsmp
>
> After the install was finished, we noticed that this Server runs
> SLOOOOOOOOOW!. Takes 4.5 minutes from power up to boot to an X splash
> screen. Then takes 30 seconds to logon to an X screen. While booting,
> the progress messages slowly move across the screen (instead of flying
> across, like we are used to). Also, the disk seems to be barely
> working, almost sleeping.
>
> We have an identical server that was installed several months ago, and
> it runs like a scalded dog. Boot time after powerup on that system is
> less than 2 minutes. X screen logon is about 7 seconds. The only
> differences between the Servers is that the 'fast' one has dual 256Mb
> DDR2 533Mhz chips running in dual channel mode, and kernel
> 2.4.21-27.0.1.ELsmp, and the 'slow' system has dual 512Mb DDR2 533Mhz
> chips running in dual channel mode with kernel 2.4.21-4.ELsmp. While
> playing trial and error, we removed one of the 512Mb memory chips from
> the 'slow' system, and it then booted and ran as fast as the 'fast'
> Server. Thinking that the memory chip might be bad, we removed the
> second 512Mb chip, and replaced it with the suspected bad one, but the
> Server continued to run fast. We then moved both 512Mb chips from the
> 'slow' Server, to the 'fast' server, and suddenly the 'fast' Server
> began to run extremely slow. Putting the dual 256Mb memory chips in the
> 'slow' server caused it to run fast. It appears that when the CPU
> memory is increased from 512Mb total, to 1Gb total on either Server,
> then that Server runs very slooooow.
>
> Is there a fix for this? I reviewed the archives and saw some instances
> of slowness, but no real fixes that work for us.
>
> Thanks in advance.
> BDavis
>
>
>
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