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Message-ID: <x49eipga02o.fsf@segfault.boston.devel.redhat.com> Date: Tue, 06 Oct 2009 13:45:03 -0400 From: Jeff Moyer <jmoyer@...hat.com> To: zach.brown@...cle.com Cc: linux-aio <linux-aio@...ck.org>, Linux Kernel Mailing <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [patch v4 0/3] aio: implement request batching [more performance numbers] Here's a mail I got from Nathan Roberts. Cheers, Jeff --- Similar test as before. I had to re-upload the files so comparing against last time isn't really apples-apples. Disk is a cciss logical drive consisting of 12 SATA drives in a RAID6 configuration with 128K stripes. Test case 1 is to read 1 million random 40K files (no file is read more than once), 16 4K iocbs at a time, 100 threads. Test case 2 is the same except 100,000 128K files are read. Unit of measure is "files read per second". 40K ------------------------------------------------- Kernel NOOP ------ ---- 2.6.30.5 682 2.6.30.5 (w/o drop_caches) 718 2.6.30.5+patch_v4 900 2.6.30.5+patch_v4 (w/o drop caches) 965 128K ------------------------------------------------- Kernel NOOP ------ ---- 2.6.30.5 242 2.6.30.5 (w/o drop_caches) 350 2.6.30.5+patch_v4 292 2.6.30.5+patch_v4 (w/o drop caches) 420 Hope it helps. Nathan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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