From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.126.187]) by mail.saout.de (Postfix) with ESMTP for ; Sun, 12 Sep 2010 11:04:21 +0200 (CEST) Date: Sun, 12 Sep 2010 11:04:20 +0200 From: Heinz Diehl Message-ID: <20100912090420.GA4674@fancy-poultry.org> References: <20100911065725.GA6279@fancy-poultry.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Subject: Re: [dm-crypt] [BUG] bad performance and system stalls when using dm-crypt List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: dm-crypt@saout.de On 12.09.2010, dave b wrote: > Should I forward my 'bug' to the linux kernel maliing list ? I'm not shure at all what causes the behaviour you encounter, there is the device-mapper, the crypto layer, the disk scheduler and a lot more which could be more or less related. There was a similar monster thread some months ago on latency issues (which was not crypto related!), Linus did a "yum update" in the background while reading mail with Alpine and encountered some severe stalls. A lot of work has been put into cfq afterwards, and latency is a still ongoing issue in the Linux kernel and on the lkml (see the patch from M. Desnoyers which came up today regarding sched granularity). In a nutshell: I don't know :-)