Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030512AbVKPVli (ORCPT ); Wed, 16 Nov 2005 16:41:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030515AbVKPVli (ORCPT ); Wed, 16 Nov 2005 16:41:38 -0500 Received: from web34102.mail.mud.yahoo.com ([66.163.178.100]:25786 "HELO web34102.mail.mud.yahoo.com") by vger.kernel.org with SMTP id S1030512AbVKPVli (ORCPT ); Wed, 16 Nov 2005 16:41:38 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:Received:Date:From:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=qpXKZouQvurCc6je/+dlwsNsEw2lA5GOG2br6x5gZ0a5oTJiB9qGMVG6GVKK7aB/9kXBy/zLSWo4LBTD0wOjX0+A5UfRTucPGXgZQP74qRvQEJCqkUtEoMgt9gST9g41AJHSf33UdAoDo15JpSZThM8NzvJxA0G3NXchnMcjEXs= ; Message-ID: <20051116214137.16970.qmail@web34102.mail.mud.yahoo.com> Date: Wed, 16 Nov 2005 13:41:37 -0800 (PST) From: Kenny Simpson Subject: Re: mmap over nfs leads to excessive system load To: Trond Myklebust Cc: Andrew Morton , linux-kernel@vger.kernel.org In-Reply-To: <1132175392.8811.49.camel@lade.trondhjem.org> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1204 Lines: 42 --- Trond Myklebust wrote: > > Is this NFSv2? > > Cheers, > Trond > This is reproducible with O_DIRECT, but not without. The profile looks the same: samples % symbol name 647042 28.4114 zap_pte_range 572195 25.1249 unmap_mapping_range 324291 14.2395 _spin_lock 139259 6.1148 __bitmap_weight 137048 6.0177 zap_page_range 104614 4.5936 unmap_mapping_range_vma 63406 2.7841 debug_smp_processor_id 48906 2.1474 sub_preempt_count 46090 2.0238 unmap_vmas 27966 1.2280 add_preempt_count 23224 1.0198 invalidate_inode_pages2_range 21676 0.9518 unmap_page_range 17825 0.7827 _spin_unlock I've had mixed results with a local ext3 file with the same test. One run had a 37 second delay while crossing 4GB, another happily went by without incident. -Kenny __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/