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[23.128.96.19]) by mx.google.com with ESMTPS id z5-20020a656645000000b003c1eb58af53si8811205pgv.294.2022.05.23.01.23.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 May 2022 01:23:56 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning linux-kernel-owner@vger.kernel.org does not designate 23.128.96.19 as permitted sender) client-ip=23.128.96.19; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b=QPcVXQdx; dkim=neutral (no key) header.i=@linutronix.de header.s=2020e header.b=pUirtnHH; spf=softfail (google.com: domain of transitioning linux-kernel-owner@vger.kernel.org does not designate 23.128.96.19 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 61A2132068; Mon, 23 May 2022 00:30:51 -0700 (PDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230027AbiEWHa2 (ORCPT + 99 others); Mon, 23 May 2022 03:30:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229961AbiEWHYk (ORCPT ); Mon, 23 May 2022 03:24:40 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1B0892618 for ; Mon, 23 May 2022 00:19:52 -0700 (PDT) Date: Mon, 23 May 2022 09:09:07 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1653289748; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=9fXGl02y6RMoaaLIdcX/WdBIdoqHbzfOjOVe1GnCbiE=; b=QPcVXQdx4xVhSQNlutu55LBMOkk8goN5Yd+g6Qk9Yhcf7EkeMlTCJzW1nF/JDLQiN2i/mo VjWizzvX3DYgUkZyZ+2uyfx/nvVxb5S4NoY8S641n+BVB4TAH9lhIaFLZ7lVVgaob3pKNm 4pWcVIx8ARh4iCLufnUlYDEXCgoklMoENYGUdkkTQvBClT2iRWIYy+g82n5+gG7nSQpbzk uc2cziWUWFtIhRB6GAyOc7h0U/gsMResXK2mHeQZ1oOlV8jidjXd6V5gsMqOhIX8h8LX+t O6RM8h90/TUwzgfYhoKmiKym5D3RrsugGQi9aEXdVlBCn9Ymi1uwkeHzGWx78g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1653289748; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=9fXGl02y6RMoaaLIdcX/WdBIdoqHbzfOjOVe1GnCbiE=; b=pUirtnHH1iEt/KEVCWaqVL0y0hyZIc/JCv0kjCf/2hMeSSRWirZ4kt/fVVPpXhIL51SZmV Y8rSMa3rqAiRXqCA== From: Sebastian Andrzej Siewior To: Stefan Wahren Cc: Marcelo Tosatti , 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 Subject: Re: vchiq: Performance regression since 5.18-rc1 Message-ID: References: <77d6d498-7dd9-03eb-60f2-d7e682bb1b20@i2se.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <77d6d498-7dd9-03eb-60f2-d7e682bb1b20@i2se.com> X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RDNS_NONE,SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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