Messages in this thread |  | | From | (H. Peter Anvin) | Subject | Re: strange df output? | Date | 31 May 1996 17:50:21 GMT |
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In article <199605301509.LAA17687@nic.ott.hookup.net>, Andrew E. Mileski <aem@nic.ott.hookup.net> wrote: > > AFAIK it doesn't slow anything down. The reserved space is simply > reserved for the root user. >
Not true. Inode-based filesystems with antifragmentation code such as ufs and ext2 suffers a dramatic loss of performance due to increased fragmentation when running for an extended time in the near-full configuration. Part of the function of the reserved space is to make sure there is enough free space to let the block placement algorithms work efficiently.
UFS usually reserves 10%, ext2 5%.
There are cases, such as news spools, where fragmentation is not a major issue since the files are so small anyway. For news spools it is safe to turn this value down quite far (I use -i 2048 -m 1 for news spools.)
-hpa
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