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dmarc=pass (policy=none) header.from=lst.de ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1793865581; b=8Sm3lJV5b/GYtQvhyz7/6AGQDBaGoB3jrkn3lFgA3l+0wY5oq5HF5lIXCqI1CgUuZZtfLk Gzh2TIS8rlBKiK8EKgc/LSxgqM89Dc2DNsnPnZ2g8ARI1gWE4bfwU8WGvzcoqVN3R0i9s6 WQBiK3CnSicFFpqFI/7owkbLlH2w0vE= Received: by verein.lst.de (Postfix, from userid 2407) id 29D0C68BEB; Thu, 5 Nov 2026 08:59:36 +0100 (CET) Date: Thu, 5 Nov 2026 08:59:35 +0100 From: Christoph Hellwig To: Mike Snitzer Cc: Christoph Hellwig , Matthew Wilcox , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Chuck Lever , Jeff Layton , linux-nfs@vger.kernel.org, NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Jens Axboe , Jonathan Corbet , Jonathan Flynn Subject: Re: [PATCH v10 7/7] NFSD: drop a shared boundary page only once both WRITEs have written it Message-ID: <20261105075935.GA18069@lst.de> References: <20261103211754.35352-1-snitzer@kernel.org> <20261103211754.35352-8-snitzer@kernel.org> <20261104091543.GA31130@lst.de> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-Stat-Signature: tjo66oi56ebbz8hjqt3mxcgacwxt8cc3 X-Rspamd-Server: rspam01 X-Rspam-User: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-Rspamd-Queue-Id: C59E180002 X-HE-Tag: 1793865580-421471 X-HE-Meta: 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 DMrpXAF3 UxY7w9HhkgIL+DrPp+3CIpTExr9JL0f39M3oZUcbxkT5fqNr+PQ31L2MwlfCfxbJkQhDrpcl47GnYyWvQ7yM1nkMGkHkLB4H2rcLGsxoLivwAJ3hBacgfGdtz7ZvFNq5VS+06l6B8bhhVmJGM7anvUQHpXDsbxwCRxwYKc5jtYWHxv7lwIH6w6a297OVOVAS3kAN5 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Wed, Nov 04, 2026 at 12:01:46PM -0500, Mike Snitzer wrote: > It is the transfer size of IO500's ior-hard: every rank writes > 47008-byte records, interleaved with the other ranks, into one shared > file, with O_DIRECT. It is meant as a hard case, and it is the > workload that showed the problem on our servers. The same happens > with any record size that is not a multiple of the page size. The > cover letter also has 6000-byte records. So based on a bit googling your totally optimize this for an intentionally stupid benchmarking workload. And that's not been disclosed anywhere. I guess everyone else was right and just ignored this bordline malicious submission.