Messages in this thread | | | Date | Fri, 4 Aug 2006 01:52:21 -0700 | From | Andrew Morton <> | Subject | Re: heavy file i/o on ext3 filesystem leads to huge ext3_inode_cache and dentry_cache that doesn't return to normal for hours |
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On Fri, 4 Aug 2006 09:53:14 +0200 "Maarten Maathuis" <madman2003@gmail.com> wrote:
> On 8/4/06, Dave Kleikamp <shaggy@austin.ibm.com> wrote: > > On Thu, 2006-08-03 at 18:27 +0200, Maarten Maathuis wrote: > > > I have a kernel specific problem and this seemed like a suitable place to ask. > > > > > > I would like responces to be CC'ed to me if possible. > > > > > > I use a 2.6.17-ck1 kernel on an amd64 system. I have observed this > > > problem on other/older kernels. > > > > > > Whenever there is serious hard drive activity (such as doing "slocate > > > -u") ext3_inode_cache and dentry_cache grow to a combined 400-500 MiB.
Increasing /proc/sys/vm/vfs_cache_pressure should increase the inode/dentry reclaim rate.
> > > > echo 2 > /proc/sys/vm/drop_caches > > > > This feature is relatively new. > > > > Thank you, i tried echo'ing a 1 into that and it had no effect iirc.
1 drops pagecache, 2 drops dentries and inodes. Pagecache pins inodes, so using 2 will drop less inodes than using 3.
> Documentation on /proc/sys/vm seems pretty scarce.
Documentation/filesystems/proc.txt
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