Re: Linux 2.6.29

Eric Sandeen
2009-03-24T18:44:29Z

Mark Lord wrote:
> Theodore Tso wrote:
>> So the question is how quickly can you *dirty* 1.6GB of memory?
> ..
>
> MythTV: rm /some/really/huge/video/file ; sync
> ## disk light stays on for several minutes..
>
> Note quite the same thing, I suppose, but it does break
> the shutdown scripts of every major Linux distribution.

It is indeed a different issue. ext3 does a fair bit of IO on a (here
60G file) delete:

http://people.redhat.com/~esandeen/rm_test/ext3_rm.png

ext4 is much better:

http://people.redhat.com/~esandeen/rm_test/ext4_rm.png

> Simple solution for MythTV is what people already do: use xfs instead.

and yes, xfs does it very quickly:

http://people.redhat.com/~esandeen/rm_test/xfs_rm.png

-Eric