cooljai

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Hi,
I have CentOS 5 system and upgraded RAM from 512 MB DDR2 to 1 GB by installing another RAM module in motherboard.

Instead of any performance enhancement, my PC become much slow while booting. Every time it stuck in "Starting udev...." for whopping 80-90 seconds and afterwards also go slow.

Plz suggest.

whansard

try all the different combinations of ram sticks and slots to figure out if it's the amount of ram, one of the slots, or one of the sticks. Then go from there.

SlowCoder

What whansard said. Plus, verify that your RAM chip specifications match each other, and your motherboard's compatibility.

salasi

Had it been 'slightly slower' you could have been forcing the computer to go into single channel memory mode from dual channel, or the memory bus could be running slower to cope with the extra load (this odd effect is the default with some chipsets, because the extra capacitance on the bus makes it hard to run the bus as fast, so the bios 'silently' slows the bus down - nice).

But those should have been 'slightly slower' not 'very slow', so I guess its something else. If you are still having trouble, posting some hardware details might reveal a few more clues.

cooljai

thanks you all for replies.

I've dual boot system with CentOS 5 (Kernel 2.6.18) and XP. Intel 3 Ghz P4 with Asus motherboard.

XP boots as normal but its CentOS which stuck in booting for around 3-4 minutes. as described earlier, CentOS was very fine with 512 MB.

what you would recommend in this situation? should I upgrade Kernal (latest 2.6.25 or huge mem etc.)

whansard

yeah. try a few different kernels.