From: "Alan D. Brunelle" <Alan.Brunelle@hp.com>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: linux-kernel@vger.kernel.org, zach.brown@oracle.com, hch@infradead.org
Subject: Re: [PATCH 0/4] Page based O_DIRECT v2
Date: Wed, 19 Aug 2009 18:23:24 -0400 [thread overview]
Message-ID: <1250720604.5589.50.camel@cail> (raw)
In-Reply-To: <20090819220640.GW12579@kernel.dk>
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
next prev parent reply other threads:[~2009-08-19 22:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-18 8:34 [PATCH 0/4] Page based O_DIRECT v2 Jens Axboe
2009-08-18 8:34 ` [PATCH 1/4] direct-io: unify argument passing by adding a dio_args structure Jens Axboe
2009-08-18 8:34 ` [PATCH 2/4] direct-io: make O_DIRECT IO path be page based Jens Axboe
2009-08-18 8:35 ` [PATCH 3/4] direct-io: add a "IO for kernel" flag to kiocb Jens Axboe
2009-08-18 8:35 ` [PATCH 4/4] direct-io: get rid of irq flag saving where it isn't needed Jens Axboe
2009-08-19 12:44 ` [PATCH 0/4] Page based O_DIRECT v2 Boaz Harrosh
2009-08-19 13:01 ` Jens Axboe
2009-08-19 19:05 ` Alan D. Brunelle
2009-08-19 22:06 ` Jens Axboe
2009-08-19 22:23 ` Alan D. Brunelle [this message]
2009-08-20 10:40 ` Jens Axboe
2009-08-20 23:12 ` Alan D. Brunelle
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