From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A93EDC433EF for ; Wed, 25 May 2022 14:08:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244692AbiEYOIh (ORCPT ); Wed, 25 May 2022 10:08:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236246AbiEYOIe (ORCPT ); Wed, 25 May 2022 10:08:34 -0400 Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.17.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E02ADA76DB for ; Wed, 25 May 2022 07:08:32 -0700 (PDT) Received: from [192.168.1.107] ([37.4.249.139]) by mrelayeu.kundenserver.de (mreue106 [212.227.15.183]) with ESMTPSA (Nemesis) id 1Mgf4k-1nLspk43qO-00h8Jk; Wed, 25 May 2022 16:07:49 +0200 Message-ID: Date: Wed, 25 May 2022 16:07:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1 Subject: Re: vchiq: Performance regression since 5.18-rc1 Content-Language: en-US To: Marcelo Tosatti , Sebastian Andrzej Siewior Cc: Andrew Morton , Nicolas Saenz Julienne , Borislav Petkov , Minchan Kim , Matthew Wilcox , Mel Gorman , Juri Lelli , Thomas Gleixner , "Paul E. McKenney" , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linux ARM , Phil Elwell , regressions@lists.linux.dev References: <77d6d498-7dd9-03eb-60f2-d7e682bb1b20@i2se.com> From: Stefan Wahren In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K1:p2z5Oxmov4jctz2aZQ5+CFweQ9+ZNhzGKPD1mZA7B+QEblEEdaD tlvpMKuRiEtGObW2wGBheYFDje5vsZm5tBrRl2bgl4SpDQDPy8FY4RoGr14WGSFwdJ2JLwx A7J43bqplqke3y0uMcbn0qEjktj9Z4LEG4CVryOnQue3lviFw0hD44zqB6AYPVPAHG0sfpJ IageqzzK3P6j5syqUtVaw== X-UI-Out-Filterresults: notjunk:1;V03:K0:kNIYU9kHu2I=:LIg2vrOd5uFgdnHurX25Ir qwu1g5ExP0CzOALXneYaDKz7c9W5XYVgvx5Ggx1OF2WpyRE+Vcym1HIIyIkyXAS941MxtHknw zVWsXJELOA0gJnk/tCEGg/MVW1k9LB9i5sAwsbanBObp7Lmv7azPx+dbOg91+gC57pjTMxOSe QE/VOmR2aFnM0WcjPTtYI8bq3+PjoxtPwb4zv4H4USIDD+N9dU8rmPdOqEdOID5m67ue9zHnW aKSvEj/CQZhDE+DH8SAp1qWpqEH5CQsMdJ1ESp56YxPVBZTOsbyTe3gt55RAb31Tpg+/QyBON lgrUW+JYdkEebUZYa5ZZ7KpWUM8cZwtd1/RG7VD/1qxb8he0USHlz++ott8djTjeAeohY5zvL CmwTCi/iCmBo6vRQ44h+a7RXzC0U5XimyHY1fDh3e+zdqK+6vcZ6yZ2n7CmuV8ibQyjzD6LPg 8kBiv2w2ZQgPX/NkfiiKrIoi9d6NuaO4dru2xT75rBjUblv1HBjC5PfcFJbk/AgV6zPjiyobJ uZLGfngTpXajbdX1cjcKuAwcHwWsPfitWq/UuRx3ZkBZdHLQCFPuoThqPZkhMDaM4NjGoOr5v sjf+boyI28MP+9U8PtdTYTboUzlu2zyGrp5MZWBaHHNfcgETP7LsgLGo/yYZOD9F/tngEVayt 9YlBD+x3baMIjX5VJVosHvrGR2BqOgCxL5QkFYIr8PwKvE3PswD14HJljpKKqAi1a7MLvGnbT tYLXIjI1cIb+uogACIffw8pdlZG8APrAq4WvyXm27fVH40sxpvMGDoP/q2M= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Marcelo, Am 25.05.22 um 15:56 schrieb Marcelo Tosatti: > On Mon, May 23, 2022 at 09:09:07AM +0200, Sebastian Andrzej Siewior wrote: >> On 2022-05-22 01:22:00 [+0200], Stefan Wahren wrote: >>> Hi, >> Hi, >> >>> while testing the staging/vc04_services/interface/vchiq_arm driver with my >>> Raspberry Pi 3 B+ (multi_v7_defconfig) i noticed a huge performance >>> regression since [ff042f4a9b050895a42cae893cc01fa2ca81b95c] mm: >>> lru_cache_disable: replace work queue synchronization with synchronize_rcu >>> >>> Usually i run "vchiq_test -f 1" to see the driver is still working [1]. >> What about >> https://lore.kernel.org/all/YmrWK%2FKoU1zrAxPI@fuller.cnet/ >> >> Sebastian > Stefan, > > Can you please try the patch above ? this was the same as Paul send. I think i need more time for investigation, maybe there is an issue with the application. All i noticed so far is that in good case the CPU usage is around ~ 60 % and higher, while in bad case the CPU is almost idle. Also the issue is not reproducible with arm64/defconfig. > > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel