From nobody Thu Nov 17 18:07:52 2022 X-Original-To: fs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4NCnvY1488z4hvGV for ; Thu, 17 Nov 2022 18:07:53 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4NCnvX74GJz44j2 for ; Thu, 17 Nov 2022 18:07:52 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1668708473; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=X77iIngYjSH9uMD88ZGjhZj9d4i2uXUJOnrUu08AxzI=; b=EMpM8/glgVbnnFKDJw+yrnsiRveizsnRnqOhr+jrwCPsOGrnihP0gDXRr34iUb8Q8/wen6 7uD3S4XM17MaWdedtJspNZZAvUSXsUKHGhAdXRLu+XHGQEeFsPLGrGaX3avqbp10DGqJ/N JzkXYXQj3qdcNbhC+mP3VZABHWf7tdJ7zZQ3SD37zz1NtbiYNws/WF0GRduq36EhVjZdus mcocO3PHMz8h8LJgsAOosMgZWXOG2XS/W1ReGQu16rS5jwwEdLDRntG/CLvj2li2uWiZ9r FLQd8ZpHVCOxkck3nJMnCyBUe+fIEQZibFXiM7rgg2gv2YykqYvczi/bIv2yWw== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1668708473; a=rsa-sha256; cv=none; b=p5YGuY1GY35UQCf8kKf01jAsHgTMVVgsV7SJcv8xWUkxZUw7nqiqHfHViwN3Ir5gEHI7ck +aVfggCw9M4JH0DPMW29xEYYU/d9z1t609QCg1IkHe+ku9EmSiCtJYiWePLVzE1XnsPbza zy8TPyG/fyImmYcAYEd5TUL5sdbJgZqYfvBDN49fwd7SSGcrdRfSxxIukdLXtwa7RS7+VL bYqQZuAzVxvOlwCZyM0rjaocWIZaCOcwdkIR3n+9gZM5W1gTfukX7jKqBU2EGefHGHNGiz mjEvNX6SLmI2X9/ijAzsFi+KsrA0oTeyAM5zmtPLOCAwmn6Z/+hvFErto0vdrA== Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 4NCnvX643RzqsK for ; Thu, 17 Nov 2022 18:07:52 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 2AHI7qgB059322 for ; Thu, 17 Nov 2022 18:07:52 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 2AHI7quJ059321 for fs@FreeBSD.org; Thu, 17 Nov 2022 18:07:52 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: fs@FreeBSD.org Subject: [Bug 250323] OpenZFS L2ARC size shrinking over time Date: Thu, 17 Nov 2022 18:07:52 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: jfc@mit.edu X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: fs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Filesystems List-Archive: https://lists.freebsd.org/archives/freebsd-fs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-fs@freebsd.org MIME-Version: 1.0 X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D250323 John F. Carr changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jfc@mit.edu --- Comment #4 from John F. Carr --- I see this on two systems running 13.1-STABLE but can not confirm any effec= t on performance. Try doing a small I/O and running "sync" for a more controlled test. Running "sync" causes the decrease to appear sooner than it ordinari= ly would. I recall that ZFS likes to merge writes on a time scale of several seconds. In the openzfs code the sysctl variable "l2_asize" is the struct field arc_stats_t. arcstat_l2_psize. This is more obscure than it ought to be. --=20 You are receiving this mail because: You are the assignee for the bug.=