From: "Renato S. Yamane" Subject: Re: Ext4 on SSD Intel X25-M Date: Mon, 16 Nov 2009 17:00:39 -0200 Message-ID: <4B01A157.8080900@diamondcut.com.br> References: <4AFC14D6.7080700@diamondcut.com.br> <20091112153017.GA32122@mit.edu> <878wea84lq.fsf@mid.deneb.enyo.de> <4B006F8A.8000606@diamondcut.com.br> <878we7v651.fsf@mid.deneb.enyo.de> <4B00730F.5060503@redhat.com> <4B0076AD.9020008@diamondcut.com.br> <20091115221146.GH4323@mit.edu> <20091116184003.GA12268@mit.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Theodore Tso , Eric Sandeen , Florian Weimer To: linux-ext4@vger.kernel.org Return-path: Received: from smtp-01.mandic.com.br ([200.225.81.132]:42580 "EHLO smtp-01.mandic.com.br" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752121AbZKPTAg (ORCPT ); Mon, 16 Nov 2009 14:00:36 -0500 Received: from unknown (HELO [192.168.1.104]) (48XWxNa3qdTI2cq3yJaVop5Ok6I=@[200.228.134.10]) (envelope-sender ) by smtp-01.mandic.com.br (qmail-ldap-1.03) with AES256-SHA encrypted SMTP for ; 16 Nov 2009 19:00:36 -0000 In-Reply-To: <20091116184003.GA12268@mit.edu> Sender: linux-ext4-owner@vger.kernel.org List-ID: On 16-11-2009 16:40, Theodore Tso wrote: > Theodore Tso wrote: >> If you've only had the disk for a short while, then the initial writes >> to install your system is probably biasing your results. So far you >> have approximately 19GB of disk writes. I'm guessing that at least >> 3-4GB is from the initial installation of software on your system. > > I just did a default Ubuntu Karmic x86_64 install, and it writes a > approximately ten and a half GB to the root partition. It also (for > no explicable reason) apparently zero's out the swap partition, which > (a) takes a long time, and (b) results in useless, pointless writes to > the SSD. Someone should complain to Ubuntu about that... the > workaround is to not configure swap during the Ubuntu install process, > and to manually configure it yourself later. > > (Or to not use swap at all, if you have enough memory in your system.) > > In any case, given that means that only 8.5GB worth of data was > written to your system, so over 30 days, your usage levels is > averaging to 0.283 GB per calendar day. I'm working with my laptop by 9h right now (this is my tipical business day) and /sys/fs/ext4/sda1/session_write_kbytes show me "324732" So, I think that you is really right. Renato S. Yamane