On 5/31/07, kelsey hudson <[EMAIL PROTECTED]> wrote:
rbw wrote: > That's what I was thinking so the notebook models I am looking at are > able to go to 4GB of RAM... I am also going to take a stab at no swap > and see if that can eliminate that whole area of concern. That is also > why I am wondering about the impact of CPU(s) and RAM increases to > overall system performance (I do realize I'm asking for a stab at this > question as opposed to an answer certain so any speculation is welcome). Having a lot of physical memory is definitely important, but having an appropriately-sized swap file or device is equally important. Swapping is almost a necessity in a modern system. It's no longer a way to get stale pages out of memory, but in a lot of cases, a very important way to get contiguous blocks of free memory back. Memory fragmentation can be a big problem, no matter how much physical RAM you have. If you have 4GB of RAM, 2 GB "free", but the largest contiguous free region is 1MB, then you really only have 1MB of memory free. That's where swap comes in -- older pages are put into the swapfile and larger contiguous regions are freed. I'd be happy to answer any questions you might have regarding this. :) -Kelsey
I checked my main host, it's configured with 6GB of RAM. With 7 VMs running, I'm looking at 121MB of swap being used. I would "hope" on a production host, I don't see 2GB of swap in use! :) -- Mark Schoonover, CMDBA [EMAIL PROTECTED] Cell: 619-368-0099 * software development * systems/database administration * networking * security * -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
