On Wed, Feb 08, 2012 at 09:56:15AM +0100, Toralf Förster wrote: > > From what I can tell is this: > If the system is under heavy I/O load and hasn't too much free RAM (git pull, > svn update and RAM consuming BOINC applications) then kernel 3.0.20 handle > this somehow while 3.2.x run into a swap storm like. FWIW, I also saw heavy swapping with 3.2.2 with the CONFIG_DEBUG_OBJECTS issue reported here: http://lkml.org/lkml/2012/1/30/227 But the thing is that even though SUnreclaim was huge there was still 1G MemFree and it swapped heavily on idle system when just switching between e.g. Firefox and gvim. Today I'm running 3.2.4 with CONFIG_DEBUG_OBJECTS disabled (but otherwise the same config) and it doesn't swap even after a fair amount of I/O: MemTotal: 3940088 kB MemFree: 1024920 kB Buffers: 293328 kB Cached: 447796 kB SwapCached: 24 kB Active: 847136 kB Inactive: 567200 kB Active(anon): 478736 kB Inactive(anon): 246744 kB Active(file): 368400 kB Inactive(file): 320456 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 3903484 kB SwapFree: 3903196 kB Dirty: 16 kB Writeback: 0 kB AnonPages: 673192 kB Mapped: 40956 kB Shmem: 52268 kB Slab: 1434188 kB SReclaimable: 1367388 kB SUnreclaim: 66800 kB KernelStack: 1600 kB PageTables: 4880 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 5873528 kB Committed_AS: 1744916 kB VmallocTotal: 34359738367 kB VmallocUsed: 348116 kB VmallocChunk: 34359362739 kB DirectMap4k: 12288 kB DirectMap2M: 4098048 kB OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 586182 353006 60% 1.74K 32595 18 1043040K ext3_inode_cache 289062 170979 59% 0.58K 10706 27 171296K dentry 247266 107729 43% 0.42K 13737 18 109896K buffer_head Johannes -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>