DragonFly bugs List (threaded) for 2009-10
Re: [issue1556] many processes stuck in "hmrrcm", system unusable
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.
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