kernel-packages team mailing list archive

[Launchpad Bug Tracker <329199@xxxxxxxxxxxxxxxxxx>]

You have been subscribed to a public bug:

I hibernate (suspend to disk).  On resume the memory image is read back
from the swap area at 70 megabytes per second.  Then my applications
start running and their memory comes back in from swap as well.  For a
large process like Firefox this takes a long time and Firefox is
unresponsive until enough of its working set has been swapped back in.
I can run "vmstat 1" and look at the "si" column to see how much data is
being brought back from swap per second as well as "bi" to see the total
number of blocks coming back in.  For the vast majority of the time the
numbers are identical meaning only swapped data is coming back in.

The swapped data comes back in at around 4 megabytes per second - a
small fraction of the 70 megabytes per second from earlier.  I usually
resort to running "swapoff -a ; swapon -a" which runs at 10 megabytes
per second and hence gets me working processes sooner.

Since I have 6GB of RAM, I would be very happy on resume from disk for
swap to be pre-emptively put back into RAM at high speed.  If the
swapped data is being page faulted in (ie 4kb each time) then that is a
really bad thing after a resume.

To repeat this, leave a terminal running "vmstat 1" and run Firefox
opening a bazillion tabs and then hibernate.  On resume try using
Firefox while watching the terminal.

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete

-- 
Slow swapin speeds after resume from disk
https://bugs.launchpad.net/bugs/329199
You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu.