From mboxrd@z Thu Jan 1 00:00:00 1970 From: john clyne Subject: IO transfer limits Date: Wed, 10 Jan 2007 08:16:24 -0800 (PST) Message-ID: <8260533.post@talk.nabble.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Received: from www.nabble.com ([72.21.53.35]:58051 "EHLO talk.nabble.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964944AbXAJQkD (ORCPT ); Wed, 10 Jan 2007 11:40:03 -0500 Received: from [72.21.53.38] (helo=jubjub.nabble.com) by talk.nabble.com with esmtp (Exim 4.50) id 1H4g7k-0006fX-9I for linux-scsi@vger.kernel.org; Wed, 10 Jan 2007 08:16:24 -0800 Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Can anyone give me some guidance on where in the IO stack I might be running into a 512KB limit on IO transfer sizes to an external FC device? I've checked IO scheduler parameter (/sys/block//queue/{max_sectors_kb,max_hw_sectors_kb}. Both are set to 32767. I'm using Qlogic HBAs (qla2312), but I don't see any relevent parameters. I'm running RHEL 4.0 with a 2.6.9-34 kernel. Any pointers would be greatly appreciated. cheers - jc -- View this message in context: http://www.nabble.com/IO-transfer-limits-tf2953389.html#a8260533 Sent from the linux-scsi mailing list archive at Nabble.com.