From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753283AbcD0H4R (ORCPT ); Wed, 27 Apr 2016 03:56:17 -0400 Received: from LGEAMRELO12.lge.com ([156.147.23.52]:33882 "EHLO lgeamrelo12.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752201AbcD0H4Q (ORCPT ); Wed, 27 Apr 2016 03:56:16 -0400 X-Original-SENDERIP: 156.147.1.126 X-Original-MAILFROM: minchan@kernel.org X-Original-SENDERIP: 165.244.98.203 X-Original-MAILFROM: minchan@kernel.org X-Original-SENDERIP: 10.177.223.161 X-Original-MAILFROM: minchan@kernel.org Date: Wed, 27 Apr 2016 16:55:49 +0900 From: Minchan Kim To: Sergey Senozhatsky CC: Andrew Morton , , Sergey Senozhatsky Subject: Re: zram: per-cpu compression streams Message-ID: <20160427075549.GB29816@bbox> References: <20160331055355.GD6736@bbox> <20160331063416.GA3343@swordfish> <20160401153829.GA1212@swordfish> <20160404002757.GC5833@bbox> <20160404011702.GB6164@swordfish> <20160418075758.GA1983@swordfish> <20160419080025.GE18448@bbox> <20160426112305.GA1155@swordfish> <20160427072954.GA29816@bbox> <20160427074335.GC7601@swordfish> MIME-Version: 1.0 In-Reply-To: <20160427074335.GC7601@swordfish> User-Agent: Mutt/1.5.21 (2010-09-15) X-MIMETrack: Itemize by SMTP Server on LGEKRMHUB05/LGE/LG Group(Release 8.5.3FP6|November 21, 2013) at 2016/04/27 16:54:20, Serialize by Router on LGEKRMHUB05/LGE/LG Group(Release 8.5.3FP6|November 21, 2013) at 2016/04/27 16:54:20, Serialize complete at 2016/04/27 16:54:20 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Apr 27, 2016 at 04:43:35PM +0900, Sergey Senozhatsky wrote: > Hello, > > On (04/27/16 16:29), Minchan Kim wrote: > [..] > > > the test: > > > > > > -- 4 GB x86_64 box > > > -- zram 3GB, lzo > > > -- mem-hogger pre-faults 3GB of pages before the fio test > > > -- fio test has been modified to have 11% compression ratio (to increase the > > > chances of re-compressions) > > > > Could you test concurrent mem hogger with fio rather than pre-fault before fio test > > in next submit? > > this test will not prove anything, unfortunately. I performed it; > and it's impossible to guarantee even remotely stable results. > mem-hogger process can spend on pre-fault from 41 to 81 seconds; > so I'm quite sceptical about the actual value of this test. > > > > considering buffer_compress_percentage=11, the box was under somewhat > > > heavy pressure. > > > > > > now, the results > > > > Yeb, Even, recompression case is fater than old but want to see more heavy memory > > pressure case and the ratio I mentioned above. > > I did quite heavy testing over the last 7 days, with numerous OOM kills > and OOM panics. Okay, I think it's worth to merge enough and see the result. Please send formal patch which has recompression stat. ;-) Thanks.