Re: VM/IO performance sucks in 2.3.99-pre6

From: Jeff V. Merkey (jmerkey@timpanogas.com)
Date: Wed May 03 2000 - 11:54:11 EST


Dirty pages should be flushed as fast as possible (they should become
eligible after 2 seconds to being flushed out to disk). Pre-6 does have
some problems.

Jeff

Richard Gooch wrote:
>
> Hi, all. I know there's been grumbling about VM/IO/LRU's/page aging
> recently. To give an idea of how bad it is:
>
> I have a drive that is capable of delivering >12 MB/s. By using dd on
> the block device (reading in more data than I have RAM), I quickly get
> to a state where I'm getting << 1 MB/s. My guess is that I'm getting
> 100 kB/s or less. Once this happens, it seems easiest to reboot to
> bring things back to a sane state.
>
> It seems the current LRU algorithm is "Least Recently Used pages will
> remain in RAM the longest". I'd call that a BFULRU.
>
> Regards,
>
> Richard....
> Permanent: rgooch@atnf.csiro.au
> Current: rgooch@ras.ucalgary.ca
>
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