From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cox Subject: Re: libata sata_via unusual behaviour Date: Sat, 17 May 2008 23:04:43 +0100 Message-ID: <20080517230443.2a3eedff@core> References: <3bbeafe90805011018o28f46794h369242ccb02b7ced@mail.gmail.com> <3bbeafe90805011158n5b45283awd43a7a534ba11456@mail.gmail.com> <20080501195823.79786815@core> <3bbeafe90805011216l1780cf5bm9bad77a414062643@mail.gmail.com> <20080501211019.21b0701d@core> <3bbeafe90805170656v58ad2dc5nb6c1efcf55b8f2cf@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:60629 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757851AbYEQWQJ (ORCPT ); Sat, 17 May 2008 18:16:09 -0400 In-Reply-To: <3bbeafe90805170656v58ad2dc5nb6c1efcf55b8f2cf@mail.gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Paolo Cc: linux-ide@vger.kernel.org > real 5m16.352s > user 0m0.132s > sys 0m6.244s So the CPU usage is ok > root@ubuntu:/media/disk/movies# ls -la Lo\ squalo.avi > -rw-r----- 1 1000 1001 1559521280 2008-03-30 06:37 Lo squalo.avi > > it means roughly those old 5mb/sec. > In the meanwhile i checked with top, and all the cpu cycles were taken > by the disk (about 98.0%wa and 0.0%id) 98.0%wa - wait time, not CPU time. Its still a very slow copy rate unless the disks are on the same IDE channel. How is the disk set up - ext3 direct or via raid/lvm ? Also is a copy of the movie to /dev/null slow or fast, ditto a copy from /dev/zero to disk of that sort of size ? Alan