From owner-svn-src-head@freebsd.org Mon Dec 24 23:52:36 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1E2501353174; Mon, 24 Dec 2018 23:52:36 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id B7B4F71DF2; Mon, 24 Dec 2018 23:52:35 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 9ECCA3C01; Mon, 24 Dec 2018 23:52:35 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wBONqZov005805; Mon, 24 Dec 2018 23:52:35 GMT (envelope-from mav@FreeBSD.org) Received: (from mav@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wBONqZ5h005804; Mon, 24 Dec 2018 23:52:35 GMT (envelope-from mav@FreeBSD.org) Message-Id: <201812242352.wBONqZ5h005804@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mav set sender to mav@FreeBSD.org using -f From: Alexander Motin Date: Mon, 24 Dec 2018 23:52:35 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r342400 - head/sys/kern X-SVN-Group: head X-SVN-Commit-Author: mav X-SVN-Commit-Paths: head/sys/kern X-SVN-Commit-Revision: 342400 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: B7B4F71DF2 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.97 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.999,0]; NEURAL_HAM_SHORT(-0.97)[-0.972,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-1.00)[-0.999,0] X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Dec 2018 23:52:36 -0000 Author: mav Date: Mon Dec 24 23:52:35 2018 New Revision: 342400 URL: https://svnweb.freebsd.org/changeset/base/342400 Log: Increase MTX_POOL_SLEEP_SIZE from 128 to 1024. This value remained unchanged for 15 years, and now this bump reduces lock spinning in GEOM and BIO layers while doing ~1.6M IOPS to 4 NVMe on 72-core system from ~25% to ~5% by the cost of additional 28KB RAM. While there, align struct mtx_pool fields to cache lines. MFC after: 1 month Modified: head/sys/kern/kern_mtxpool.c Modified: head/sys/kern/kern_mtxpool.c ============================================================================== --- head/sys/kern/kern_mtxpool.c Mon Dec 24 23:28:11 2018 (r342399) +++ head/sys/kern/kern_mtxpool.c Mon Dec 24 23:52:35 2018 (r342400) @@ -62,14 +62,14 @@ static MALLOC_DEFINE(M_MTXPOOL, "mtx_pool", "mutex poo /* Pool sizes must be a power of two */ #ifndef MTX_POOL_SLEEP_SIZE -#define MTX_POOL_SLEEP_SIZE 128 +#define MTX_POOL_SLEEP_SIZE 1024 #endif struct mtxpool_header { int mtxpool_size; int mtxpool_mask; int mtxpool_shift; - int mtxpool_next; + int mtxpool_next __aligned(CACHE_LINE_SIZE); }; struct mtx_pool {