From owner-freebsd-hackers Thu Oct 29 22:17:28 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id WAA04336 for freebsd-hackers-outgoing; Thu, 29 Oct 1998 22:17:28 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from lor.watermarkgroup.com (lor.watermarkgroup.com [207.202.73.33]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id WAA04330 for ; Thu, 29 Oct 1998 22:17:24 -0800 (PST) (envelope-from luoqi@watermarkgroup.com) Received: (from luoqi@localhost) by lor.watermarkgroup.com (8.8.8/8.8.8) id BAA01820; Fri, 30 Oct 1998 01:17:17 -0500 (EST) (envelope-from luoqi) Date: Fri, 30 Oct 1998 01:17:17 -0500 (EST) From: Luoqi Chen Message-Id: <199810300617.BAA01820@lor.watermarkgroup.com> To: mike@smith.net.au, peter.jeremy@auss2.alcatel.com.au Subject: Re: sync writes with softupdates enabled Cc: hackers@FreeBSD.ORG Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > > > > All I can think of is that the MMAP'd history file is causing the > > kernel to unnecessarily perform sync writes to try and keep the > > MMAP and VFS images in sync. > > That's almost certainly correct. Try running without mmap. It used to > be faster that way; maybe it is again? > It may be related to vfs_msync() not respecting MNT_NOWAIT flags when calling vm_object_page_clean(). -lq > -- > \\ Sometimes you're ahead, \\ Mike Smith > \\ sometimes you're behind. \\ mike@smith.net.au > \\ The race is long, and in the \\ msmith@freebsd.org > \\ end it's only with yourself. \\ msmith@cdrom.com > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message