From owner-freebsd-geom@freebsd.org Fri Dec 27 17:53:27 2019 Return-Path: Delivered-To: freebsd-geom@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id EF4491CA9A1; Fri, 27 Dec 2019 17:53:27 +0000 (UTC) (envelope-from mavbsd@gmail.com) Received: from mail-yb1-xb29.google.com (mail-yb1-xb29.google.com [IPv6:2607:f8b0:4864:20::b29]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 47kvZH09yZz4Mtp; Fri, 27 Dec 2019 17:53:26 +0000 (UTC) (envelope-from mavbsd@gmail.com) Received: by mail-yb1-xb29.google.com with SMTP id w126so9622992yba.3; Fri, 27 Dec 2019 09:53:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:to:cc:from:subject:autocrypt:message-id:date:user-agent :mime-version:content-language:content-transfer-encoding; bh=CqVXPeAhfkK6BEgC3DQUkYZdKvnPnoJ1+kbTC1Jt/TY=; b=JMqqlowRfMUirHusZMSt91sOzO5iFiUxTGOpTPLM7l2HFkMv4iT+Kq4x3IWQHwTBP5 cWiUdAbM7VPgWQJENpG8t3njzDVVBNtbQlRTh7XuUGlHAd5cMm15Lvh9Ra99cZ7XvXxK iDhuV8SOL+ylt2mIwJ6/To6PG2EFoRQNBiGlE8YrTJE5gdzzLtiz4bhFRdoMzxT2YOiH 9CMZ/OXBDRPyhpIKupe6z0Ow8crWDPxxsAW0MzORWHKjvKjRF8LRURciOxcwtiYSC06+ ObwtfDmE6Qfovc3yiN+J+FIqJ3T7OLLs3Am5UYHXLPxk5wvR0G2c4B9CYgvw/0AKbUXw Qwvg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:to:cc:from:subject:autocrypt:message-id :date:user-agent:mime-version:content-language :content-transfer-encoding; bh=CqVXPeAhfkK6BEgC3DQUkYZdKvnPnoJ1+kbTC1Jt/TY=; b=sb5VSdXyV+0o1szEJaNOASI1eVPyZqezTA1AiIxL8zQUJFEJVgzh8OXfGtrZ3DdoKp HX4u6oEKiRwJgdaVyDa4Ao+2iRDvxXgJMldUWK2Ut8kLiRt5QAqw2jgHxZ2nqNdokfUT T+H00ACsk5on4xx5BXOpqHMC6GCgLT3zI2DNml1p7oQfpmqUmvenJoyrMgVW+bu68n9G I2FU89Dd6cl2DuUjcb1j0KsfFwydgH77SB2R2znTh68uNH3C9bA4Nq+zu/rkWunRAZPi biDA5VZk/rnTArMaZKEukj+y1fTyc4p9/qDsaCVT8UrVjUn7pIZY/TTJ0tDGIMZ9Xczn A1xQ== X-Gm-Message-State: APjAAAXFSLcYhGYlG4mt79E0DA4Mum3PlQBX8uv8TX3HVuK49WBHrlOJ Vbgg+3ox6ndsc4pR2esYlT8qlwwT X-Google-Smtp-Source: APXvYqykzGMFExM6CsfoeIu8Z7STAhTOGRRTgdu087UJ2b1DCEZN03V1lsCvJVPbSdrv1lptq+UJAA== X-Received: by 2002:a25:2901:: with SMTP id p1mr36186321ybp.75.1577469205690; Fri, 27 Dec 2019 09:53:25 -0800 (PST) Received: from mavoffice.ixsystems.com ([12.189.233.129]) by smtp.gmail.com with ESMTPSA id y206sm14275095ywa.102.2019.12.27.09.53.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 27 Dec 2019 09:53:25 -0800 (PST) Sender: Alexander Motin To: "freebsd-geom@FreeBSD.org" , "freebsd-arch@freebsd.org" Cc: Warner Losh , Luigi Rizzo , "Andrey V. Elsukov" , Pawel Jakub Dawidek , "Conrad E. Meyer" From: Alexander Motin Subject: gsched: modernize or remove? Autocrypt: addr=mav@FreeBSD.org; prefer-encrypt=mutual; keydata= mQENBFOzxAwBCADkPrax0pI2W/ig0CK9nRJJwsHitAGEZ2HZiFEuti+6/4UVxj81yr4ak/4g 9bKUyC7rMEAp/ZHNhd+MFCPAAcHPvtovnfykqE/vuosCS3wlSLloix2iKVLks0CwbLHGAyne 46lTQW74Xl/33c3W1Z6d8jD9gVFT/xaVzZ0U9xdzOmsYAZaAj4ki0tuxO9F7L+ct9grRe7iP g8t9hai7BL4ee3VRwk2JXnKb7UvBiVITKYWKz1jRvZIrjPokgEcCLOSlv7x/1kjuFnj3xWZU 7HSFFT8J93epBbrSSCsYsppIk2fZH41kaaFXsMQfTPH8wkeM6qwrvOh4HiQM08R+9tThABEB AAG0IUFsZXhhbmRlciBNb3RpbiA8bWF2QEZyZWVCU0Qub3JnPokBVwQTAQoAQQIbAwULCQgH AwUVCgkICwUWAwIBAAIeAQIXgAIZARYhBOmM88TmnMPNDledVYMYw5VbqyJ/BQJZYMKuBQkN McyiAAoJEIMYw5VbqyJ/tuUIAOG3ONOSNYqjK4eTZ1TVh9jdUBAhWk5nhDFnODN49Wj0AbYm 7aIqy8O1hnCDSZG5LttjSAo3UfXJZDKQM0BLb0gpRMBnAYqO6tdolLNqAbPGJBnGoPjsh24y 6KcbDaNnis+lD4GwPXwQM+92wZGhCUFElPV9NciZGVS65TNIgk7X+yEjjhD1MSWKKijZ1r9Z zIt4OzUTxxNOvzdlABZS88nNRdJkatOQJPmFdd1mpP6UzTNCiLUo1pIqOEtJgvVVDYq5WHY6 tciWWYdmZG/tIBexJmv2mV2OLVjXR6ZeKmntVH14H72/wRHJuYHQC+r5SVRcWWayrThsY6jZ Yr4+raS5AQ0EU7PEDAEIAOZgWf2cJIu+58IzP2dkXE/urj3tr4OqrB/yHGWUf71Lz6D0Fi6Z AXgDtmcFLGPfMyWuLAvSM+xmoguk7zC4hRBYvQycmIhuqBq1jO1Wp/Z+lpoPM/1cDYLn8Flv mI/c40MhUZh345DA4jYWWaZNjQHUWVQ1fPf595vdVVMPT/abE8E5DaF6fSkRmqFTmfYRkfbt 3ytU8NdUapDcJVY7cEP2nJBVNZPnOIObR/ZIgSxjjrG5o34yXoqeup8JvwEv+/NylzzuyXEZ R1EdEIzQ/a1nh/0j4NXtzZEqKW4aTWlmSqb6wN8jh1OSOOqkYsfnE3nfxcZbxi4IRoNQYlm5 9R8AEQEAAYkBPAQYAQoAJgIbDBYhBOmM88TmnMPNDledVYMYw5VbqyJ/BQJZYMLYBQkNMczM AAoJEIMYw5VbqyJ/TqgH/RQHClkvecE0262lwKoP/m0Mh4I5TLRgoJJn8S7G1BnqohYJkiLq A6xe6urGD7OqdNAl12UbrjWbdJV+zvea3vJoM4MZuYiYrGaXWxzFXqWJcPwMU9sAh8MRghHu uC5vgPb45Tnftw9/+n0i8GfVhQhOqepUGdQg4NPcXviSkoAvig6pp9Lcxisn0groUQKt15Gc sS9YcQWg3j9Hnipc6Mu416HX98Fb113NHJqc2geTHLkRyuBFOoyIqB6N9GKjzOAIzxxsVdl9 TevwGsrp4M4/RFzWbSgsbOnbE7454lmuVZGfReEjnUm8RHp9Q2UWKXlp3exlZjvOp/uVEpCg lz65AQ0EU7PEDAEIAOZgWf2cJIu+58IzP2dkXE/urj3tr4OqrB/yHGWUf71Lz6D0Fi6ZAXgD tmcFLGPfMyWuLAvSM+xmoguk7zC4hRBYvQycmIhuqBq1jO1Wp/Z+lpoPM/1cDYLn8FlvmI/c 40MhUZh345DA4jYWWaZNjQHUWVQ1fPf595vdVVMPT/abE8E5DaF6fSkRmqFTmfYRkfbt3ytU 8NdUapDcJVY7cEP2nJBVNZPnOIObR/ZIgSxjjrG5o34yXoqeup8JvwEv+/NylzzuyXEZR1Ed EIzQ/a1nh/0j4NXtzZEqKW4aTWlmSqb6wN8jh1OSOOqkYsfnE3nfxcZbxi4IRoNQYlm59R8A EQEAAYkBPAQYAQoAJgIbDBYhBOmM88TmnMPNDledVYMYw5VbqyJ/BQJZYMLYBQkNMczMAAoJ EIMYw5VbqyJ/TqgH/RQHClkvecE0262lwKoP/m0Mh4I5TLRgoJJn8S7G1BnqohYJkiLqA6xe 6urGD7OqdNAl12UbrjWbdJV+zvea3vJoM4MZuYiYrGaXWxzFXqWJcPwMU9sAh8MRghHuuC5v gPb45Tnftw9/+n0i8GfVhQhOqepUGdQg4NPcXviSkoAvig6pp9Lcxisn0groUQKt15GcsS9Y cQWg3j9Hnipc6Mu416HX98Fb113NHJqc2geTHLkRyuBFOoyIqB6N9GKjzOAIzxxsVdl9Tevw Gsrp4M4/RFzWbSgsbOnbE7454lmuVZGfReEjnUm8RHp9Q2UWKXlp3exlZjvOp/uVEpCglz4= Message-ID: <6d466360-988f-e80d-3212-b6c479a5ec03@FreeBSD.org> Date: Fri, 27 Dec 2019 12:53:24 -0500 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 47kvZH09yZz4Mtp X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=JMqqlowR; dmarc=none; spf=pass (mx1.freebsd.org: domain of mavbsd@gmail.com designates 2607:f8b0:4864:20::b29 as permitted sender) smtp.mailfrom=mavbsd@gmail.com X-Spamd-Result: default: False [-3.81 / 15.00]; ARC_NA(0.00)[]; TO_DN_EQ_ADDR_SOME(0.00)[]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; DMARC_NA(0.00)[FreeBSD.org]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; RCVD_COUNT_THREE(0.00)[3]; IP_SCORE(-2.61)[ip: (-8.94), ipnet: 2607:f8b0::/32(-2.16), asn: 15169(-1.88), country: US(-0.05)]; DKIM_TRACE(0.00)[gmail.com:+]; RCVD_IN_DNSWL_NONE(0.00)[9.2.b.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; RCPT_COUNT_SEVEN(0.00)[7]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FORGED_SENDER(0.30)[mav@FreeBSD.org,mavbsd@gmail.com]; SUBJECT_ENDS_QUESTION(1.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[mav@FreeBSD.org,mavbsd@gmail.com]; MID_RHS_MATCH_FROM(0.00)[] X-BeenThere: freebsd-geom@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: GEOM-specific discussions and implementations List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Dec 2019 17:53:28 -0000 Hi, As I can see, gsched code was not really maintained for the last 10 years since being added. It misses many GEOM features added later, such as direct dispatch, unmapped I/O, stripesize/stripeoffset, resize, etc. Even if some of them may require just a proper declaration, it tells me that barely anybody used it seriously for years. But my primary concern is the `gsched insert` implementation. Right now I got to it since it is the last consumer of nstart/nend counters in GEOM, which I would like to remove for performance reasons. But I also see tons of potential problems with idea of moving providers between unaware geoms. So my question is: does it make sense to try fix/modernize it, or it just be easier to remove it? Does anybody still use it, or see some future for it? -- Alexander Motin