[issue1556] many processes stuck in "hmrrcm", system unusable

Sun Oct 4 15:55:54 PDT 2009

Steve O'Hara-Smith wrote:
	If you are suffering the latter then I would certainly agree with
the suggestion to mount with noatime, I do this routinely for any file
system which gets heavy random file access because atime updates will
cripple performance on any filesystem I have ever used by making the discs
spend more time seeking than reading. It does sound like hammer may suffer
more than other filesystems from this.
This is possible.  However I don't want to mount all my file systems 
noatime.  I'm using atime regularly for various purposes, so I don't 
really want to run without it.  Maybe I can try it though.

I think even with atime turned on, a filesystem needs to perform 
acceptable.  I'm not talking about high throughput.  I'm talking about 
xterm+shell taking >10s until the prompt appears, or vim occasionally 
hanging for several seconds.

cheers
  simon
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