From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f49.google.com (mail-oi0-f49.google.com [209.85.218.49]) by kanga.kvack.org (Postfix) with ESMTP id 986BC6B006C for ; Thu, 25 Jun 2015 21:43:15 -0400 (EDT) Received: by oiax193 with SMTP id x193so65619693oia.2 for ; Thu, 25 Jun 2015 18:43:15 -0700 (PDT) Received: from mail-ob0-x233.google.com (mail-ob0-x233.google.com. [2607:f8b0:4003:c01::233]) by mx.google.com with ESMTPS id my18si11249740obc.75.2015.06.25.18.43.14 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Jun 2015 18:43:15 -0700 (PDT) Received: by obbkm3 with SMTP id km3so58451936obb.1 for ; Thu, 25 Jun 2015 18:43:14 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20150626014248.GA26543@swordfish> References: <20150624152518.d3a5408f2bde405df1e6e5c4@linux-foundation.org> <20150626005808.GA5704@swordfish> <20150626014248.GA26543@swordfish> Date: Thu, 25 Jun 2015 18:43:14 -0700 Message-ID: Subject: Re: extremely long blockages when doing random writes to SSD From: Luigi Semenzato Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org List-ID: To: Sergey Senozhatsky Cc: Andrew Morton , Linux Memory Management List I will try and report, thanks. On Thu, Jun 25, 2015 at 6:42 PM, Sergey Senozhatsky wrote: > 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