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[2620:137:e000::1:20]) by mx.google.com with ESMTP id ca26-20020a056a00419a00b006871527e5cdsi6541398pfb.345.2023.08.13.08.33.41; Sun, 13 Aug 2023 08:33:52 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@alien8.de header.s=alien8 header.b=VCWTsAEO; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231223AbjHMOUA (ORCPT + 99 others); Sun, 13 Aug 2023 10:20:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38018 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229506AbjHMOT7 (ORCPT ); Sun, 13 Aug 2023 10:19:59 -0400 Received: from mail.alien8.de (mail.alien8.de [IPv6:2a01:4f9:3051:3f93::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 20CEF10FC for ; Sun, 13 Aug 2023 07:19:59 -0700 (PDT) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id 7B23540E0195; Sun, 13 Aug 2023 14:19:57 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at mail.alien8.de Authentication-Results: mail.alien8.de (amavisd-new); dkim=pass (4096-bit key) header.d=alien8.de Received: from mail.alien8.de ([127.0.0.1]) by localhost (mail.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id b3Dc-pOvR-_j; Sun, 13 Aug 2023 14:19:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1691936395; bh=Ikll8sNbMqlBqkwitjtaer8Ua46WTTXt7+Lsp1w8wDw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=VCWTsAEOjxe4ymgkU5mMUzv3epDmr8ipDV72zaAj43kNbfdOo9v7LxwszITjG5Iet w/15SqWQLZ7UZ8luDMWl7PR+YhaI3+nrrmC2myvCEGeU1DPEn5di5WpQb6E+MKW3xP n2P0K/cbj9loIQqMbq7OGPrPJkJiDW40Ena7rK9wd1OiH5RFhMSxj89PHzJduF/CPC 8jQ72vnmLWhld/kB6riyvphB2FCCDCwAaia9jsfJ1o9D7bX0gXirKtoJh1d7o9JE1m lM1mrP5KmQacQA++pdsRXEIqCFxQN9wEseHSfPNNdUWzQl60WlJ9mxq9wuGafZ93N3 NaVmRzYZq847PrbMgpWQJkr4T5d4tBLnzY8Qm+zMKWQ2GEHmc1+QMDCe4rP0pQnjXv d0YO29wGdfaXFQwAh+PggzLInj6k3vwu7CKlKIft6+py/MyihGhSnFy3PzyM4vpluI ykDq5EJLghPBMmnKyItN0y8C3Q1SDMJA+ahlDzuXBsi22zYEIrO23sfupcu0JeJ2Lg cSzkZ9EfjxTXXTZXSXNcNTG5P3Sce5v0/nYa34HgtPffPuI9o8nbF9aJButskdEUjJ LUmxtdJquZQrnZKzWZnDIdd405gPZyFSLas8wY11LHRb/wed0nqALThj17Scg7X++B QPIB2D0rAUZ0S2cMV1tRxbDY= Received: from zn.tnic (pd9530d32.dip0.t-ipconnect.de [217.83.13.50]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id E49E040E00B0; Sun, 13 Aug 2023 14:19:51 +0000 (UTC) Date: Sun, 13 Aug 2023 16:19:45 +0200 From: Borislav Petkov To: Mikhail Gavrilov Cc: Linux List Kernel Mailing , x86@kernel.org Subject: Re: [regression/bisected] Add IBPB decreases performance in two times Message-ID: <20230813141945.GFZNjmgZbHvMhLYtJl@fat_crate.local> References: <20230813082413.GAZNiTLaOxUNUHPvlf@fat_crate.local> <20230813093502.GBZNijxgueFxBTxWwG@fat_crate.local> <20230813111425.GEZNi7EXyHOLQTNzFg@fat_crate.local> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED,SPF_PASS, T_SPF_HELO_TEMPERROR autolearn=ham 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 Sun, Aug 13, 2023 at 04:38:59PM +0500, Mikhail Gavrilov wrote: > Too sad, this means that others must also face this problem. And not > everyone will know about a possible solution. Nah, most people search the net and usually find the documentation, as past experience shows. In this case, they will find: https://kernel.org/doc/html/latest/admin-guide/hw-vuln/srso.html It will be there next week but here's the source: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/hw-vuln/srso.rst -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette