Thanks Dianne ! I think what we need to do is first find the cause of lagginess. Anyone knows of tool to find how much paging is happening ?
Regards, Pradeep On Aug 22, 5:40 am, Dianne Hackborn <hack...@android.com> wrote: > You really really do not want to just poke values in to these things trying > to find something that seems to work. > > There are a lot of reasons a device can be "laggy." Specifically in terms > of RAM, this is usually a matter of how much paging the kernel needs to do > as your running apps use their ram vs. how much background app processes are > killed to reclaim memory for foreground apps. > > On devices with a lot of RAM, this is not much of an issue, so the values > (in particular the oom minfree values) are generally tuned conservatively to > more aggressively kill background processes in order to avoid paging. > > When you are getting tight on RAM, there is a careful balance between having > enough RAM to keep everything running in the background the user may > reasonably desire and avoiding paging. > > Also the desired values for these vary with the type of device -- for > example a device with a higher resolution screen needs more RAM for its > frame buffers; one with a higher density screen needs more RAM for its > widget graphics. These both increase the overall working set of the running > system, requiring more RAM available to avoid paging. > > The current values for these in the GB tree are tuned for a Nexus S style > device -- a fair amount of RAM, hdpi phone screen. You can tune those down > a bit for lower-end devices, but keep a careful eye on how much paging is > happening. > > Of course if your laginess is not related to paging, none of this will help. > > > > > > > > > > On Sat, Aug 20, 2011 at 4:18 AM, Pradeep <bhatt.prad...@gmail.com> wrote: > > Hi, > > > I am trying to reduce some lagginess in my platform and wanted to try > > out some tweaks as mentioned in following link > > >http://forum.xda-developers.com/showthread.php?t=1111145 > > > It is trying to change values of following parameters > > > /proc/sys/vm/swappiness > > /proc/sys/vm/vfs_cache_pressure > > /proc/sys/vm/dirty_expire_centisecs > > /proc/sys/vm/dirty_writeback_centisecs > > /proc/sys/vm/dirty_ratio > > /proc/sys/vm/dirty_background_ratio > > > Is it safe to do so ? > > Any ideas why these values help in reducing the lagginess ? > > > Regards, > > Pradeep > > > -- > > unsubscribe: android-porting+unsubscr...@googlegroups.com > > website:http://groups.google.com/group/android-porting > > -- > Dianne Hackborn > Android framework engineer > hack...@android.com > > Note: please don't send private questions to me, as I don't have time to > provide private support, and so won't reply to such e-mails. All such > questions should be posted on public forums, where I and others can see and > answer them. -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
