From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 138ED3947BC for ; Mon, 16 Mar 2026 12:39:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773664789; cv=none; b=BGEg/560uuvITWT7IAL3KWWaFQSmxXHcRtbQnFsS7tHNf9ZRrqT27SVvdHdR8pxiNZCOQQ3v6dbkD63bSlaEm2nvsxAs7miYiEplDzJZXKG5jp6fB++0RRd10vWSp3l2mlgYi8AZsr9HH4yA3vaZP1Cif4bKuPGUG+4lJnwE5l8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773664789; c=relaxed/simple; bh=1I0m0MS17xskY1jpOtGcVJRw0G/+p4DClJjuXodO5Kc=; h=MIME-Version:Date:From:To:Message-Id:In-Reply-To:References: Subject:Content-Type; b=B6bSCktXPkYaIg4ZcxvmIVJ7DnZNGHGrR2aEansNGlMaAiwO/d1Aa+WSFsUge6EEtw67jhwuDKEjnZOi0ZA0rsBifcG95cloAyjn9Retbgoe3qXFyagVw/z0L8UqHussWtw/25ETVk0YrF84sQJL9SnLpqVT4+lBMks35dk40HQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=h8qZ7kQs; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="h8qZ7kQs" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B7A6C19424 for ; Mon, 16 Mar 2026 12:39:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773664788; bh=1I0m0MS17xskY1jpOtGcVJRw0G/+p4DClJjuXodO5Kc=; h=Date:From:To:In-Reply-To:References:Subject:From; b=h8qZ7kQs90T9n+4kYJXPKzLbCXsLaREKRE8J4DsyT6s9hQPHzhkJ50Redgzx7C+J5 RrA+4opAVDBTt9pc6AaTU1lXbqS9N8Mp1YaO5H7S7+rXZkPEFC177HC+8jYqiw74fw yK5otTem1ErdzbEqNTbhoe0K36HgqmxBDq6X1wErz4bFC6OWBc/z5QWa/puws1SUVa yr9JyXRL7bohZmw3k5vkRDkGGd015i07aCbDsMQKU2Ei++k6MaJgkLacOsLc9LUspL dGWd+ps9iPXIMOKjlebCok2D60D2ZsWER2EM2/+kooKaNsUvwMWTi7ZpoiwJz48QdJ ZTVEGQurAD30g== Received: from phl-compute-10.internal (phl-compute-10.internal [10.202.2.50]) by mailfauth.phl.internal (Postfix) with ESMTP id AB182F40074; Mon, 16 Mar 2026 08:39:47 -0400 (EDT) Received: from phl-imap-15 ([10.202.2.104]) by phl-compute-10.internal (MEProxy); Mon, 16 Mar 2026 08:39:47 -0400 X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefgedrtddtgddvleekgedtucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfurfetoffkrfgpnffqhgenuceu rghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujf gurhepofggfffhvffkjghfufgtgfesthejredtredttdenucfhrhhomhepfdevhhhutghk ucfnvghvvghrfdcuoegtvghlsehkvghrnhgvlhdrohhrgheqnecuggftrfgrthhtvghrnh epheehjeelgeffffeihfduudevudeghfehheefhffgueeluedufeetjeduhfdukeelnecu vehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomheptghhuhgtkh hlvghvvghrodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhithihqdduieefgeelleel heelqdefvdelkeeggedvfedqtggvlheppehkvghrnhgvlhdrohhrghesfhgrshhtmhgrih hlrdgtohhmpdhnsggprhgtphhtthhopedvpdhmohguvgepshhmthhpohhuthdprhgtphht thhopegtvggurhhitgdrsghlrghntghhvghrsehgmhgrihhlrdgtohhmpdhrtghpthhtoh eplhhinhhugidqnhhfshesvhhgvghrrdhkvghrnhgvlhdrohhrgh X-ME-Proxy: Feedback-ID: ifa6e4810:Fastmail Received: by mailuser.phl.internal (Postfix, from userid 501) id 871AF780076; Mon, 16 Mar 2026 08:39:47 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: AnK-AOf-hwWB Date: Mon, 16 Mar 2026 08:39:26 -0400 From: "Chuck Lever" To: "Cedric Blancher" , "Linux NFS Mailing List" Message-Id: <5acaa8e7-0691-4cbd-b501-c26831a7be81@app.fastmail.com> In-Reply-To: References: Subject: Re: Increase default NFSv4 server size "max_block_size" to 4MB Content-Type: text/plain Content-Transfer-Encoding: 7bit On Mon, Mar 16, 2026, at 3:51 AM, Cedric Blancher wrote: > As debated a while ago, can the default NFSv4 server size for > "max_block_size" be increased to 4MB, please? There is an administrative setting to raise this limit for recent versions of the kernel. Can you report your experience when you raise the limit? Hiccups, performance issues, etc? I would kind of like this exercise to be data-driven. What is still unknown to me is which NFS client implementations can support 4MB or 8MB. Without client support, an increase in the default in NFSD doesn't mean anything. Rick, Anna, Roland? -- Chuck Lever