From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qa0-f49.google.com (mail-qa0-f49.google.com [209.85.216.49]) by kanga.kvack.org (Postfix) with ESMTP id 64E976B009D for ; Thu, 26 Jun 2014 14:04:46 -0400 (EDT) Received: by mail-qa0-f49.google.com with SMTP id w8so3055396qac.22 for ; Thu, 26 Jun 2014 11:04:46 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id l10si10403834qad.51.2014.06.26.11.04.45 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 26 Jun 2014 11:04:45 -0700 (PDT) From: Jeff Moyer Subject: Re: [PATCH 6/6] cfq: Increase default value of target_latency References: <1403683129-10814-1-git-send-email-mgorman@suse.de> <1403683129-10814-7-git-send-email-mgorman@suse.de> <20140626161955.GH10819@suse.de> <20140626174500.GI10819@suse.de> Date: Thu, 26 Jun 2014 14:04:34 -0400 In-Reply-To: <20140626174500.GI10819@suse.de> (Mel Gorman's message of "Thu, 26 Jun 2014 18:45:00 +0100") Message-ID: MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: Linux Kernel , Linux-MM , Linux-FSDevel , Johannes Weiner , Jens Axboe , Dave Chinner Mel Gorman writes: >> And we should probably run our standard set of I/O exercisers at the >> very least. But, like I said, it seems like wasted effort. >> > > Out of curiousity, what do you consider to be the standard set of I/O > exercisers? Yes, that was vague, sorry. I was referring to any io generator that will perform sequential and random I/O (writes, re-writes, reads, random writes, random reads, strided reads, backwards reads, etc). We use iozone internally, testing both buffered and direct I/O, varying file and record sizes and across multiple file systems. Data sets that fall inside of the page cache tend to have a high standard deviation, so, as an I/O guy, I ignore those. ;-) Cheers, Jeff -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org