Messages in this thread | | | Subject | Re: [PATCH 0/4] Page based O_DIRECT v2 | From | "Alan D. Brunelle" <> | Date | Wed, 19 Aug 2009 18:23:24 -0400 |
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On Thu, 2009-08-20 at 00:06 +0200, Jens Axboe wrote:
> > Thanks a lot for the test run, Alan. I wonder why writes are down while > reads are up. One possibility could be a WRITE vs WRITE_ODIRECT > difference, though I think they should be the same. The patches I posted > have not been benchmarked at all, it's still very much a work in > progress. I just wanted to show the general direction that I thought > would be interesting. So I have done absolutely zero performance > testing, it's only been tested for whether it still worked or not (to > some degree :-)... > > I'll poke a bit at it here, too. I want to finish the unplug/wait > problem first. Is your test case using read/write or readv/writev? >
Hi Jens - I just had some extra cycles, so figured what the heck... :-)
Actually, this is using asynchronous direct I/Os (libaio/Linux native AIO). If I get a chance tomorrow, I'll play with read/write (and/or readv/writev).
Alan
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