SWAP Info

[whiteknight · Accepted solution]

Marvin

I cut and paste the differece between 2 type of swap space

WK

[Enrico P.]

Hi,
I hope this help you:

http://www.docs.hp.com/en/B2355-90950/ch06s03.html#d0e54987

Enrico

[A. Clay Stephenson]

There is really nothing wrong with filesystem swap (and yes, it is worse on performance than device swap but Big Woo!). Note that the priority of both your device swap and filesystem swap is set to 1. You normally want to set filesystem swap to a lower swap priority (higher number) so that it will be used later. I would modify the /etc/fstab entry to set the priority to 5 or so.

Now back to Big Woo: Using device swap, the performance impact of significant swapping is perhaps 100X worse compared to not swapping. For filesystem swapping this might rise to 110X worse. For both the performance impact is so bad that the differences are really not worth worrying about. This is truly a case of rearranging the deck chairs on the Titanic.

[Marvin L. Diaz]

Thanks all for your help.

cheers!!!