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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id ED2ECC43458 for ; Sat, 27 Jun 2026 01:36:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=CoKSivJMaQDV2sSkRTRw7olGkcZfQ72Xwmih/Aa0td0=; b=uzJmKmVAt5l6/vTDxg93IqJvcG mQcJ8MfD6WQmxLZlOnZb6JmEblX8eX3KtT58BVwNZJeoTO8vGYPD3wQwz2MPtLzAc51iw43HcepIT v/6kTZ2Cs6XlCd31VkVZYYYh7Ltys1woySLXDp1dBDN+cmnOzy15xObRiZaNjT3BRIwNLZ4NFYnqy NxBKDQYpkSz9RMwmVzgho/0eqPu5nLeF7ei9qMFoL20wGKxNAzxe3pUw+IR5r4MYDA8UEQQErGZCf INiJRlc4W9XYIc17cQzAlLgj051CG/7g1dLSOkuhFhYEQOY2lBqwplgg5qQi3ochPksE5GWLVkEaE GtYKlWaA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wdHyK-0000000C3WY-2NXL; Sat, 27 Jun 2026 01:36:40 +0000 Received: from terminus.zytor.com ([2607:7c80:54:3::136] helo=mail.zytor.com) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wdHyG-0000000C3W5-149k; Sat, 27 Jun 2026 01:36:39 +0000 Received: from [IPV6:2601:646:8081:7da1:dcd4:e1f8:5d79:bdb4] ([IPv6:2601:646:8081:7da1:dcd4:e1f8:5d79:bdb4]) (authenticated bits=0) by mail.zytor.com (8.18.1/8.17.1) with ESMTPSA id 65R0qN0N2285168 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NO); Fri, 26 Jun 2026 17:52:24 -0700 DKIM-Filter: OpenDKIM Filter v2.11.0 mail.zytor.com 65R0qN0N2285168 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2026052701; t=1782521550; bh=CoKSivJMaQDV2sSkRTRw7olGkcZfQ72Xwmih/Aa0td0=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=qMyBFc1gnGXRksBwsJ1/rUznZgiE7lPuLPv/lWpmOM+5Q3Fqu1GkBtPV/i01hTsmm FyrrwODPBIMXlAoyCpEVfCiClmUhwPWsNagz78j3LDMf+Ut0XXJAAidVe9l1aTOAut 7WQuEQASgzET2NWeiLHKYC5brvZfsPACaGhvlYNW5X1iG8c+02aTJiS4yaJSFbtRty RzVpKhz70FSqCBKm8TK2gLW8sDPukFdgs1lqJ60AGqtpglwDIA/PnerR6f0L+dvu0f tzL0aZnBm0Ed9q+Fj1E4zhVGr5LPAVMhZk4GFV4YP0Rst/9nwzTfe9CuWNPpW58FjU Q8Foj51/YA5sw== Message-ID: <7d8efc7c-65e3-49f8-9381-910de7affef2@zytor.com> Date: Fri, 26 Jun 2026 17:52:18 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: cleanup the RAID6 P/Q library v3 To: Christoph Hellwig , Andrew Morton Cc: Catalin Marinas , Will Deacon , Ard Biesheuvel , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Herbert Xu , Dan Williams , Chris Mason , David Sterba , Arnd Bergmann , Song Liu , Yu Kuai , Li Nan , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-crypto@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-arch@vger.kernel.org, linux-raid@vger.kernel.org References: <20260518051804.462141-1-hch@lst.de> <20260518141205.c100f76eec5f58e78bbbf7af@linux-foundation.org> <20260519082432.GA14956@lst.de> Content-Language: en-US, sv-SE From: "H. Peter Anvin" In-Reply-To: <20260519082432.GA14956@lst.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260626_183638_479962_81B51C68 X-CRM114-Status: GOOD ( 10.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2026-05-19 01:24, Christoph Hellwig wrote: > > raid6: rework registration of optimized algorithms > > - avx2 instead of avx512 is probably the right thing for no > benchmarking, but if it was intentional (it wasn't), that should > be document. So I'll just switch back to the previous version to > keep the state of the art It is unlikely to be the right thing *going forward*, though. The very unfortunate performance inversion is likely model-specific. It is one of those things where you largely would have to have a list of quirks :( -hpa