From nobody Sat Jun 15 11:04:32 2024 X-Original-To: bugs@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 4W1YFF2fQ5z5Nc48 for ; Sat, 15 Jun 2024 11:04:33 +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 4W1YFF1ZpZz420L for ; Sat, 15 Jun 2024 11:04:33 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1718449473; a=rsa-sha256; cv=none; b=dg1/kFBwf9gDj5TxF7WUEh45l6RTFQZatZsCl0nfQIDXfCfgc9gTkaPcYMYpy2QmY3nfUo B2Etx29sCmQxWmE/mfUDK56BYl0mgE3vf8eP8jTeb5cqKzJWd0zb2iUMpKKLcIvDREA1kM qXauZ2ugOO4hKJGLwOZF3Ysie/K8pJ7kASjykrkUJns3AB++yyu+3Wk3cycVe1Zp2MSyHe Ahr8JW1aJY2FHjxwAl2NbvSppUYzQmOBHia3Jy5+PZ9XVX1OBVJithmJAqqnMade1MOOfG zCNCmVt6ZHKh5FyF788oyFzA7KSMTE9iiwXQCTPQRtTWwf2nXYKBSL7Mu6OUDw== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1718449473; 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=7Zt7xGv7D4Z5cZYwvxWeuwnv34tb86wLceO6L7fM9cc=; b=q3iGNUqyQybL+brNeaH0jXGwyTs7+w+xm/1KTg4L5b9wW8FMMorqtc5Ta/s7eRqEUnQAqB wfVUj1Kn/op2yHB5cOJwFe/vOOXbu/8xhQAty43lZiTNaRFmjM6V88Z3qqFbk1aOB/wjQQ lpeklKdMr+OTsde8tWGLL1WHgvk8GuDe6xv96Zxm4iUbaLpgMFXlfqWb3zV7xVKRz2Czdl RZFYFISnS92CfszsinbGb+Jn0aj1mJg/bR8OWM0nqAb4rmyafqkMXb5kknsjqs8wOgKm4p XHIIa9Z56OvRW9Eq9eAxlmObfJwO7HooI/u0PYSnXpoBbRVU/XKWIaRUf8MGmw== 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 4W1YFF19H1z11q6 for ; Sat, 15 Jun 2024 11:04:33 +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 45FB4Xnh070775 for ; Sat, 15 Jun 2024 11:04:33 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 45FB4Xn3070774 for bugs@FreeBSD.org; Sat, 15 Jun 2024 11:04:33 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: bugs@FreeBSD.org Subject: [Bug 279737] mpi3mr running out of chain in 14.1-RELEASE Date: Sat, 15 Jun 2024 11:04:32 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: misc X-Bugzilla-Version: 14.1-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: bofh@freebsd.org X-Bugzilla-Status: Closed X-Bugzilla-Resolution: Works As Intended X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: resolution bug_status 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: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D279737 Muhammad Moinur Rahman changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |Works As Intended Status|Open |Closed --- Comment #7 from Muhammad Moinur Rahman --- (In reply to Sarder Kamal from comment #6) Definitely someone can help you understand it but it's like a Pandora's Box. DMA or Direct Memory Access is used by the CPU to reduce the locking of CPU= and so that another device can independently access the Memory rather than slow= ing down the CPU. So while making these sort of requests to access the memory t= he devices uses chained request rather than sequential requests which are slow= er than hell. The problem is with the growth of the CPU markets the OS designe= rs has to keep up with the number of DMA chained request the OS can handle. FreeBSD also keeps pushing these limits to a higher value for increased performance. The more chained DMA requests you can complete that specific p= iece of hardware will be able to copy more data from the memory to the devices in each cycle without locking the CPU. Although the underlying problem is not within the driver. But now you can find some at least a bit better performa= nce with(32768) your card although I am not sure if we can benchmark it. --=20 You are receiving this mail because: You are the assignee for the bug.=