> > How do I notice slowdowns ? The JuK lags so badly that it can't play > > any music, the mouse pointer freezes, kwin effects freeze for few > > seconds. > > How can I make it much worse ? I can try & run disk clean up under XP, > > that is running in VBox, with folder compression. On top of it if I > > start copying big files in linux ( 700MB avis, etc ), GUI effects > > freeze, mouse pointer freezes for few seconds. It may also help to lower the dirty ratio. echo 5 > /proc/sys/vm/dirty_ratio Memory pressure + heavy write can easily hurt responsiveness. - eats up to 20% (the default value for dirty_ratio) memory with dirty pages and hence increase the memory pressure and number of swap IO - the file copy makes the device write congested and hence makes pageout() easily blocked in get_request_wait() As a result every application may be slowed down by the heavy swap IO when page fault as well as being blocked when allocating memory (which may go into direct reclaim and then call pageout()). Thanks, Fengguang -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>