From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f182.google.com (mail-pd0-f182.google.com [209.85.192.182]) by kanga.kvack.org (Postfix) with ESMTP id D41196B0038 for ; Thu, 25 Jun 2015 21:42:20 -0400 (EDT) Received: by pdbep18 with SMTP id ep18so42661104pdb.1 for ; Thu, 25 Jun 2015 18:42:20 -0700 (PDT) Received: from mail-pd0-x231.google.com (mail-pd0-x231.google.com. [2607:f8b0:400e:c02::231]) by mx.google.com with ESMTPS id z10si47782763pdl.29.2015.06.25.18.42.19 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Jun 2015 18:42:20 -0700 (PDT) Received: by pdbep18 with SMTP id ep18so42660935pdb.1 for ; Thu, 25 Jun 2015 18:42:19 -0700 (PDT) Date: Fri, 26 Jun 2015 10:42:48 +0900 From: Sergey Senozhatsky Subject: Re: extremely long blockages when doing random writes to SSD Message-ID: <20150626014248.GA26543@swordfish> References: <20150624152518.d3a5408f2bde405df1e6e5c4@linux-foundation.org> <20150626005808.GA5704@swordfish> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Luigi Semenzato Cc: Sergey Senozhatsky , Andrew Morton , Linux Memory Management List On (06/25/15 18:31), Luigi Semenzato wrote: > We're using CFQ. > > CONFIG_DEFAULT_IOSCHED="cfq" > ... > CONFIG_IOSCHED_CFQ=y > CONFIG_IOSCHED_DEADLINE=y > CONFIG_IOSCHED_NOOP=y > any chance to try out DEADLINE? CFQ, as far as I understand, doesn't make too much sense for SSDs. -ss -- 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