From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: [patch]btrfs: finish read pages in the order they are submitted Date: Mon, 8 Feb 2010 12:44:34 +0100 Message-ID: <20100208114433.GD1025@kernel.dk> References: <20100203074511.GA26548@sli10-desk.sh.intel.com> <20100203181845.GE22119@think> <20100208105901.GA1025@kernel.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Shaohua Li , linux-btrfs@vger.kernel.org To: Chris Mason Return-path: In-Reply-To: <20100208105901.GA1025@kernel.dk> List-ID: On Mon, Feb 08 2010, Jens Axboe wrote: > Cache stats (millions) > > Kernel References Misses > ---------------------------------------------- > baseline 3547 2387 > patched 3822 2351 > > These numbers are very stable, the above were also averaged over 3 runs, > but variability was very low. Update on this. I setup the storage system for more stable runs and repeated the above test. It runs a bit faster as well, completes the workload at 2.5GB/sec average. Cache stats (millions) Kernel References Misses ---------------------------------------------- baseline 3384 2318 baseline 3417 2313 baseline 3382 2323 baseline avg 3394 2318 patched 3518 2258 patched 3428 2201 patched 3536 2274 patched avg 3494 2244 So for those runs, ~3% more references and ~3 less misses. Even with the variability here, that looks like a win in my book. -- Jens Axboe