From owner-freebsd-gecko@freebsd.org Sun Sep 17 16:30:31 2017 Return-Path: Delivered-To: freebsd-gecko@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 29046E1C7D5 for ; Sun, 17 Sep 2017 16:30:31 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 10C9A6434C for ; Sun, 17 Sep 2017 16:30:31 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 0C567E1C7D4; Sun, 17 Sep 2017 16:30:31 +0000 (UTC) Delivered-To: gecko@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 0BF7AE1C7D2 for ; Sun, 17 Sep 2017 16:30:31 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id EE5916434B for ; Sun, 17 Sep 2017 16:30:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v8HGUU56011958 for ; Sun, 17 Sep 2017 16:30:30 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: gecko@FreeBSD.org Subject: [Bug 222356] www/firefox: file-backed shared memory performance Date: Sun, 17 Sep 2017 16:30:31 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Ports & Packages X-Bugzilla-Component: Individual Port(s) X-Bugzilla-Version: Latest X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: tijl@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: gecko@FreeBSD.org X-Bugzilla-Flags: maintainer-feedback? X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-gecko@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Gecko Rendering Engine issues List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 Sep 2017 16:30:31 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222356 --- Comment #4 from Tijl Coosemans --- (In reply to Konstantin Belousov from comment #3) It's UFS with softupdates and journaling. This test program is more like what Firefox does. It opens and unlinks a f= ile, sets the size with ftruncate and uses mmap. There's no disk I/O that I can notice except for the final close which causes a lot of I/O. If you put mu= nmap last the I/O happens on that call. The bigger the file the longer it takes= .=20 Surely this isn't all metadata? #include #include #include #include #include int main( void ) { int fd; size_t sz; void *base; sz =3D 128 * 1024 * 1024; fd =3D open( "nosync.data", O_RDWR | O_CREAT, 0600 ); unlink( "nosync.data" ); ftruncate( fd, sz ); base =3D mmap( NULL, sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_NOSYNC, fd, 0 ); puts( "calling memset" ); memset( base, '0', sz ); puts( "memset called" ); sleep( 5 ); puts( "calling munmap" ); munmap( base, sz ); puts( "munmap called" ); sleep( 5 ); puts( "calling close" ); close( fd ); puts( "close called" ); sleep( 5 ); return( 0 ); } I didn't really investigate the problem with your patch. I could build Fir= efox fine and then suddenly gmake couldn't find some targets that were clearly defined in the Makefile. Rerunning the make command a couple times always = gave this same error. Rebooting with the old kernel fixed it. --=20 You are receiving this mail because: You are the assignee for the bug.=