From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-f47.google.com (mail-wg0-f47.google.com [74.125.82.47]) by kanga.kvack.org (Postfix) with ESMTP id 397D16B0037 for ; Wed, 18 Jun 2014 04:23:32 -0400 (EDT) Received: by mail-wg0-f47.google.com with SMTP id k14so442086wgh.6 for ; Wed, 18 Jun 2014 01:23:31 -0700 (PDT) Received: from mx2.suse.de (cantor2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id cz10si1702283wjb.75.2014.06.18.01.23.29 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 18 Jun 2014 01:23:29 -0700 (PDT) From: Mel Gorman Subject: [PATCH 0/4] Improve sequential read throughput Date: Wed, 18 Jun 2014 09:23:23 +0100 Message-Id: <1403079807-24690-1-git-send-email-mgorman@suse.de> Sender: owner-linux-mm@kvack.org List-ID: To: Linux Kernel , Linux-MM , Linux-FSDevel Cc: Jan Kara , Johannes Weiner , Jens Axboe , Mel Gorman IO performance since 3.0 has been a mixed bag. In many respects we are better and in some we are worse and one of those places is sequential read performance, particularly for higher numbers of threads. This is visible in a number of benchmarks but tiobench has been the one I looked at the closest despite its age. 3.16.0-rc1 3.16.0-rc1 3.0.0 vanilla patch-series vanilla Mean SeqRead-MB/sec-1 121.88 ( 0.00%) 133.84 ( 9.81%) 134.59 ( 10.42%) Mean SeqRead-MB/sec-2 101.99 ( 0.00%) 115.01 ( 12.77%) 122.59 ( 20.20%) Mean SeqRead-MB/sec-4 97.42 ( 0.00%) 108.40 ( 11.27%) 114.78 ( 17.82%) Mean SeqRead-MB/sec-8 83.39 ( 0.00%) 97.50 ( 16.92%) 100.14 ( 20.09%) Mean SeqRead-MB/sec-16 68.90 ( 0.00%) 82.14 ( 19.22%) 81.64 ( 18.50%) The impact on the other operations is negligible. Note that 3.0-vanilla is still far better but bringing the patch series further in line would involve increasing the CFQ target latency higher and there should be better options. This series is a major improvement on 3.16-rc1-vanilla at least so worth sending out to a larger audience for comment. block/cfq-iosched.c | 2 +- include/linux/mmzone.h | 9 +++ include/linux/writeback.h | 1 + include/trace/events/pagemap.h | 16 ++-- mm/internal.h | 1 + mm/mm_init.c | 5 +- mm/page-writeback.c | 15 ++-- mm/page_alloc.c | 176 ++++++++++++++++++++++++++--------------- mm/swap.c | 4 +- 9 files changed, 144 insertions(+), 85 deletions(-) -- 1.8.4.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org