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 69EF53C463 for ; Tue, 19 Nov 2024 16:37:55 +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=1732034275; cv=none; b=KwVUbwWb8iQv07rFkMwuSHtnLKvQ7GSPYlD7UbOdGSXRZnC1cZMC7DrqN/s47ALX3rkrTncM+xQE+58qkuiwj95MibejzWc6EolHr7bsrrGOIkchF4aQ4y4EMpRPdSe5q5GdmcWYB6i9rbdqJZpWvokga0sLcZsKV3yr69baWS0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732034275; c=relaxed/simple; bh=m98xyXRZwPnqz60d2AT3oYAGvXykrM0zrqz/Br85erg=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=TGMik5cKROJaVq7jSSS1kQSugXFhJ46LDPnVxnLKzNEvAy80scVfuf9laevztRMR53JcfuVGyqymvxGwaikMFbfyvXM5GzJVt8+UhleAadjgeLyHDGbW5zuXRMBlOByTAw9DwJmUEz3/BoQ4TH/2xtWWqNz6zI4JLBQEBnirlWA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FYQnjUl2; 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="FYQnjUl2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9659BC4CECF; Tue, 19 Nov 2024 16:37:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732034275; bh=m98xyXRZwPnqz60d2AT3oYAGvXykrM0zrqz/Br85erg=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=FYQnjUl2o0vO/FcraprCDJ5P8mWu+H0MtAwZghWTuruQI5IELCbncxErMgUcpV3D2 BLsT/V7ik7zL0yTw6gPHvO8MakLJ8sgZ5wc0g1kWNpwpZwlyt0vi3Zovgfq8hOnFu5 aJHHogy69eVi5Ld0qdwLJkoLtxXp9TqpAicc0lmWUHD7TOlsEkUBtJPGJhbfCeEh35 ZCoicoqx1uqKUFJ51308LQv3YlJVvtRKg/1kw7XtsV7BuNqehudFl6ZxUUBHcXvpBK y0BV+0vbgAsYSqHezSTAkvqhyHHc/DUs09zTTL3pn144nBGMHkCDUSyC/NkVeCJqZe 9RUCwykm5MCiA== Message-ID: Subject: Re: OPEN_XOR_DELEGATION performance problems From: Jeff Layton To: Chuck Lever III , Trond Myklebust Cc: "snitzer@kernel.org" , Tom Haynes , "anna@kernel.org" , Linux NFS Mailing List , Oliver Sang Date: Tue, 19 Nov 2024 11:37:53 -0500 In-Reply-To: <4210AE90-97EE-4B32-AC67-1DB80082D4CC@oracle.com> References: <4210AE90-97EE-4B32-AC67-1DB80082D4CC@oracle.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV 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06:45 -0500, Jeff Layton wrote: > > > We attempted to implement the "delstid" draft for v6.13, but have had > > > to drop the patches for it. After merge, we got a couple of reports > > > of > > > a performance issue due to the OPEN_XOR_DELEGATION patch: > > >=20 > > >=20 > > > https://lore.kernel.org/linux-nfs/202409161645.d44bced5-oliver.sang@i= ntel.com/ > > >=20 > > > Once we enable OPEN_XOR_DELEGATION support, the fsmark "App Overhead" > > > statistic spikes significantly. The kernel patch for this is very > > > simple, and doesn't seem likely to cause a performance issue on its > > > own. My theory is that this test is one that causes the client to > > > return the delegation, and since it doesn't have an open stateid, it > > > has to reestablish one during the test run, and that causes the app > > > overhead stat to spike. > > >=20 > > > Trond, Tom, Mike -- I know that the HS Anvil has support for > > > OPEN_XOR_DELEGATION. If you run the fsmark test against it with that > > > support both enabled and disabled (either on the client or server > > > side), do you see a similar spike in "App Overhead"? > > >=20 > > > If so, then I suspect we need to consider limiting the use of that > > > flag > > > in some cases. I have no idea what heuristic we'd use to decide this > > > though. > >=20 > > As already stated when we discussed this at Bakeathon: the server is > > still in charge of heuristics w.r.t. whether or not there may be > > contention for the file. The OPEN_XOR_DELEGATION flag changes nothing > > in that respect. >=20 > fsmark is a single-client test. There should be no contention > for any files during this test. >=20 >=20 > > Yes, I'm sure you can find tests which cause recalls of delegations, > > and those will be marginally slower when the client has to re-establish > > an open stateid. >=20 > The fsmark result regressed 92%. >=20 To be clear, the fsmark "App Overhead" regressed 92%. Which has a curious definition: "App overhead is time in microseconds spent in the test not doing file writing related system calls." It encompasses a bunch of different test setup stuff, and it's been difficult to nail down the part that is slower. See Oliver's email here: https://lore.kernel.org/linux-nfs/ZwTm4e5JxOOJc7JC@xsang-OptiPlex-9020/ --=20 Jeff Layton