From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?B?R8O8bnRlciBXYWxsZXI=?= Subject: Samsung 840 EVO Date: Mon, 04 May 2015 14:38:55 +0200 Message-ID: <5547685F.7000103@web.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: Received: from mout.web.de ([212.227.17.11]:57221 "EHLO mout.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752602AbbEDMjF (ORCPT ); Mon, 4 May 2015 08:39:05 -0400 Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Tejun Heo Cc: linux-ide@vger.kernel.org Dear Tejun, the subject Samsung SSD is having performance issues with "old data" which Samsung now addresses with a new firmware. As often is the case, Linux users find it a bit more difficult to apply that fix. However, I also have a Windows system, so it should be no big deal for me. But there is also a big concern for Linux users which this FW version seems to introduce. The link below points to a warning (backed by others, elsewhere on the web) that fstrim in combination with this FW will wreck your drive. http://www.overclock.net/t/1507897/samsung-840-evo-read-speed-drops-on-old-written-data-in-the-drive/2640%23post_23827674 (search for fstrim) I raised this in a discussion thread of the Ubuntu MATE community and was pointed to the SSD blacklist that is part of the module libata-core.c which names you as the maintainer. I wonder if you could take a look at this issue - maybe you want to add the device to the blacklist thereafter if need be. If you find the time and find this worthwhile to investigate I would appreciate a brief notification of the outcome. For now I am holding back the FW update. Best regards Guenter Waller