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 7F638211C for ; Tue, 19 Nov 2024 11:45:55 +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=1732016755; cv=none; b=K08neZVSs+TQ+55aSghyIoai7BeQhYPZsbuSRIYVIHiazGoJSTLTRzozR+EdsiqPW0ZdzkFbyCEYDNOxlmOjFW6qgMBCmbMoOlVxyoyIXq/ExO+1QBTKE68ihpVjws4x38IJYf2tIJkw1XFa1Iyo9T3B0TZQ6vM3afGGGJyWU9Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732016755; c=relaxed/simple; bh=sknQb4sMYgVBc5OTNgj0+/DG66v++nV8OOTVI1llrMs=; h=Message-ID:Subject:From:To:Cc:Date:Content-Type:MIME-Version; b=HZGk8X/Qrtq6WKqMytpi8Hzn996XMmFzz2J7w8NxeI1zG6jud+mhoWZ0aBTArIkxkqChPc8t5QLsQ7Nd9abggr7YnuTX/y9AX+k+FxgYxjbIMH8v0xG339ETSuLsCaKldDuiy7XjTbwkioV9Vfppd86vsyC1wpvxRvyNcV+65aE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=E8PtoR6U; 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="E8PtoR6U" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 75219C4CECF; Tue, 19 Nov 2024 11:45:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732016755; bh=sknQb4sMYgVBc5OTNgj0+/DG66v++nV8OOTVI1llrMs=; h=Subject:From:To:Cc:Date:From; b=E8PtoR6UgoBGvtMn5AQBTvx/HgA66BmHik1AlHkd2ZREVJoKfZ6vWamgg4vYJUNod i8vwraJT+T7zrEXlaP9jAzhb5oi24jtDw8Agv3jovisww5r0Vy80x+2sWrlGAlGj5i ZlVe/ZcSwwvV+c8jScQuw5zLe5oA38wx7SjsynkJVJzb0VF6MOhksS6ig1c35tccxy LMusQWWftpb48f9Jt+YhlhjCGGjTr74HIgM9mMnLMNxoqcS7z6PNlyUbgBYpAKXEIO HEMCaGtFco9KA5K75k2JF+utf0xbqWtdjqHmfLCdUV03/42LoxF/21KtJFJ0cI8LmR CrtqXgpTbw5PA== Message-ID: Subject: OPEN_XOR_DELEGATION performance problems From: Jeff Layton To: Tom Haynes , Trond Myklebust , Mike Snitzer Cc: Chuck Lever , Anna Schumaker , linux-nfs@vger.kernel.org Date: Tue, 19 Nov 2024 06:45:53 -0500 Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ 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After merge, we got a couple of reports of a performance issue due to the OPEN_XOR_DELEGATION patch: https://lore.kernel.org/linux-nfs/202409161645.d44bced5-oliver.sang@int= el.com/ 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. 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"? 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 Jeff Layton