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

From: "Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>
Date: Mon, 05 Oct 2009 00:53:46 +0200

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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