Re: [rfc] lockless pagecache

Nick Piggin
2005-06-28T00:32:51Z

Benjamin LaHaise wrote:
> On Mon, Jun 27, 2005 at 06:02:15PM +1000, Nick Piggin wrote:
>
>>However I think for Oracle and others that use shared memory like
>>this, they are probably not doing linear access, so that would be a
>>net loss. I'm not completely sure (I don't have access to real loads
>>at the moment), but I would have thought those guys would have looked
>>into fault ahead if it were a possibility.
>
>
> Shared memory overhead doesn't show up on any of the database benchmarks
> I've seen, as they tend to use huge pages that are locked in memory, and
> thus don't tend to access the page cache at all after ramp up.
>

To be quite honest I don't have any real workloads here that stress
it, however I was told that it is a problem for oracle database. If
there is anyone else who has problems then I'd be interested to hear
them as well.

--
SUSE Labs, Novell Inc.

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