On Wednesday 25 May 2011 10:31:19 Paul Hartman wrote: > When I move the swap to a slow SD card instead (2MB/sec transfer > rate), even in that slow device, swapoff on the eMMC swap partition > with ~500M in-use takes about 2 or 3 minutes at most with the data > being swapped slowly into the SD card. > > So I think in your case it should be much faster than that!
you are comparing apples with oranges (harddisks with moving arms with solid state devices). Do yourself a favour. Look up how long a harddisk needs to position its head. Now you can calculate how many times a second a harddisk can position its head. Now remember: swap is stupid, so lots and lots of head movement needed (and a cash flush is running too - so even more movements to write all that crap to disk), The result: the whole mess is fscking slow. You can have a nice fat raid with nice and fast harddisks - if you try to stream to a 15 year old DLT drive with 5/10mb/sec speed the dlt drive will constantly rewind - because harddisks suck when they have to seek. And swap (just like a backup) = lots and lots and lots of seeks.
