 | | | Sloooooow RHEL 3 system with 1GB memory | Sloooooow RHEL 3 system with 1GB memory 2005-01-22 - By Billy Davis
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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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