From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Philip Roper Subject: readpages and network file systems Date: Tue, 12 Oct 2004 12:10:05 +1000 Sender: linux-fsdevel-owner@vger.kernel.org Message-ID: <416B3CFD.1070505@anu.edu.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from anumail3.anu.edu.au ([150.203.2.43]:24706 "EHLO anu.edu.au") by vger.kernel.org with ESMTP id S268535AbUJLCKK (ORCPT ); Mon, 11 Oct 2004 22:10:10 -0400 To: linux-fsdevel@vger.kernel.org, James Roper List-Id: linux-fsdevel.vger.kernel.org Hi Am I right in saying that the kernel has a maximum of 128K readpages? I saw some discussion in the archives relating to the efficiency of reads that size in the context of block devices, and a lot of people were saying that reads shouldn't be larger than that because of various problems, but what about network file systems? I'm implementing read ahead routines in cifs, and i think reads in the megabytes could greatly increase bandwidth utilisation, as you can have up to 50 cifs requests of 64K each on the wire at any one time. The larger the reads, the less the round trip time has effect. Please CC any responses to me as I am not on the mailing list. James