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[2604:1380:45d1:ec00::1]) by mx.google.com with ESMTPS id ea18-20020a05620a489200b007815b96c567si4164381qkb.484.2024.01.12.17.32.53 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Jan 2024 17:32:53 -0800 (PST) Received-SPF: pass (google.com: domain of linux-nfs+bounces-1067-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=KVlZy2kj; spf=pass (google.com: domain of linux-nfs+bounces-1067-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) smtp.mailfrom="linux-nfs+bounces-1067-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 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t=1705109571; bh=pqXtKREM5Mk4n+P8OcwWWk3EYKPgAunLp1vzS+vCyuA=; h=Subject:From:To:Date:In-Reply-To:References:From; b=KVlZy2kj8OJfg51WiF+g0cWFnQSwCo/FGzy1Ck3NqGOntC9p7ICiX2MM293pEd+AZ RRLlGR57IicMU87Rv4tRYYOBYDMVSmPRqRW0/fdg08jBY0s5QFDdn2toIM6KqgfcfT P2Wy/SNXTWKmfW9cObrTdwiTicg25akaXiIp+X0JOYJoEpxC9mP4u603BBLtY9Sdfk ydL7iCPvGZqbzlC2TxOPP6Gow9o7gOlvOtRZom2+OXaDXsmS1nrvR6zG9ZIF/p3T77 rshcSvBm8M4tDnIZK4mdDbwN/sWY9TaYYQfar+H5dp2LNJTZnv2mD4GrMrkkdJp31i 7vDG0eBLzC6cQ== Message-ID: <89fba598b0b93cf97bf208e106001f74eadd1829.camel@kernel.org> Subject: Re: Increasing NFSD_MAX_OPS_PER_COMPOUND to 96 From: Jeff Layton To: Dan Shelton , Linux NFS Mailing List Date: Fri, 12 Jan 2024 20:32:49 -0500 In-Reply-To: References: Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.2 (3.50.2-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sat, 2024-01-13 at 01:19 +0100, Dan Shelton wrote: > Hello! >=20 > We've been experiencing significant nfsd performance problems with a > customer who has a deeply nested filesystem hierarchy, lots of > subdirs, some of them 60-80 dirs deep (!!), which leads to an > exponentially slowdown with nfsd accesses. >=20 > Some of the issues have been addressed by implementing a better > directory walker via multiple dir fds and openat() (instead of just > cwd+open()), but the nfsd side still was a pretty dramatic issue, > until we bumped #define NFSD_MAX_OPS_PER_COMPOUND in > linux-6.7/fs/nfsd/nfsd.h from 50 to 96. After that the nfsd side > behaved MUCH more performant. >=20 I guess your clients are trying to do a long pathwalk in a single COMPOUND? Is this the windows client? At first glance, I don't see any real downside to increasing that value. Maybe we can bump it to 100 or so? What would probably be best is to propose a patch so we can discuss the change formally. Cheers, --=20 Jeff Layton