From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: copy speed slows down after kernel update Date: Tue, 2 Dec 2014 14:34:45 -0500 Message-ID: <20141202193445.GN10918@htj.dyndns.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-qg0-f51.google.com ([209.85.192.51]:34340 "EHLO mail-qg0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934035AbaLBTes (ORCPT ); Tue, 2 Dec 2014 14:34:48 -0500 Received: by mail-qg0-f51.google.com with SMTP id l89so9629380qgf.38 for ; Tue, 02 Dec 2014 11:34:47 -0800 (PST) Content-Disposition: inline In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: =?utf-8?B?0JzQuNGF0LDQuNC7?= Cc: linux-ide@vger.kernel.org Hello, On Fri, Nov 28, 2014 at 02:13:35PM +0400, =D0=9C=D0=B8=D1=85=D0=B0=D0=B8= =D0=BB wrote: > Technical description: > MacBook Air Model A1370 (googling as: Apple MacBook Air "Core i7" 1.8= 11" > (Mid-2011)) > Disk A: Lacie Little Big Disk with Samsung HN-M101MBB 1 TB > Disk B: Lacie Little Big Disk with OCZ Vertex 3 > Disk C: Seagate thunderbolt Adapter from STCB3000400 with OCZ Vertex = 3 > Disk D: Seagate thunderbolt Adapter from STCB3000400 with Samsung > HN-M101MBB 1 TB >=20 > using copy cammand: dd if=3D/dev/sda(internal Mac Book disk) > of=3D/mnt/sdb1/test.dd bs=3D4M >=20 > Test bench 1. Bootable distro based on Debian whezzy 7.2 stable from > October 12, 2013, kernel 3.2.0.4 > 1.1 Disk A (ext2). Stable copying speed =3D 81,4 MB/s. > 1.2 Disk B (ext2). Stable copying speed =3D 196 MB/s. !!!!! > 1.3 Disk C (ext2). Stable copying speed =3D 199 MB/s. > 1.4 Disk D (ext2). Stable copying speed =3D 87 MB/s. >=20 > Test bench 2. Bootable distro based on Debian jessie from November 17= , > 2014, kernel 3.16.7 + thunderbolt driver compiled in. > 2.1 Disk A (ext2). Stable copying speed =3D 94 MB/s. > 2.2 Disk B (ext2). Stable copying speed =3D 150 MB/s. !!!!!! >=20 > Test bench 3. Bootable distro based on Debian jessie from November 17= , > 2014, kernel 3.17.3 + thunderbolt driver compiled as module. > 3.1 Disk A (ext2). Stable copying speed =3D 97 MB/s. > 3.2 Disk B (ext2). Stable copying speed =3D 151 MB/s. > 3.3 Disk C (ext2). Stable copying speed =3D 156 MB/s. !!!!! > 3.4 Disk D (ext2). Stable copying speed =3D 108 MB/s. >=20 > after and before insmod .../thunderbolt.ko the same results. Can you please post kernel boot messages from the old and new kernels? Thanks. --=20 tejun