Messages in this thread | | | Date | Wed, 06 Dec 2006 15:51:34 -0500 | From | Phillip Susi <> | Subject | Re: 2.6 tmpfs/swap performance oddity |
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Magnus Naeslund(k) wrote: > But tmpfs seems to get really slow when it has to swap out stuff from > tmp to a 80 gb swap partition, much slower than just writing a file > to the ext3 fs. Maybe this is a known thing, and easily tuned, but > I've not seen any solutions when googling around.
This is a SWAG ( Silly Wild Ass Guess ), but maybe tmpfs isn't mapping the files sequentially in ram, or is otherwise doing something to prevent proper swap clustering and read ahead?
> Somehow I think I'm missing something here, maybe we're not supposed > to use tmpfs in this way at all? What more information can I supply > to narrow down the problem? Is there any secret knobs that I can use > to tune swap performance?
You aren't supposed to be using tmpfs in this way at all ;)
tmpfs is meant to hold small files that will only exist for a short time, or do not need to persist after a reboot. Keep your big data files on a normal filesystem, and let the kernel worry about caching the most frequently accessed parts.
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