Messages in this thread | | | Date | Tue, 28 Jun 2005 10:32:51 +1000 | From | Nick Piggin <> | Subject | Re: [rfc] lockless pagecache |
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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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