From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from 008.lax.mailroute.net (008.lax.mailroute.net [199.89.1.11]) (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 44EDB5231 for ; Thu, 21 Mar 2024 22:57:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=199.89.1.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711061833; cv=none; b=dPziCs4w9aYErgZcZRC3Qho+MD+OYgtWaPnRMFznX2UO4x6ag7IJchYDKgUxXqRemJIjOX7AFGoK+HeooD8VkRRQLo/5eXRqVoKvLJg/fr9N8R862T3K3+/J2CP9Tihrs7BO40E35It7eZe8f81G4zCNNKrhprT3emi1QfAtPos= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711061833; c=relaxed/simple; bh=iM2qeI+ui3Vbrt27py8b64OKLBb2MmCyRQfCRIKf4iM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=WXTnd7JctfrA3IhRP1123UUz0fJiDZFNpYAB3L2b5TKgneHkj0LBsExzqSsD0o+2xamAnIM3kJNSzJi+GXfdHHfyz/ivDpSZtg9kyBkiBXwAmkGmpgvjpObM30EOdq5b4VnJ2Ka3cm9GoicrH1xDSGv7UO9SivZtnC+AStQGi4w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=acm.org; spf=pass smtp.mailfrom=acm.org; dkim=pass (2048-bit key) header.d=acm.org header.i=@acm.org header.b=FuKmzHxw; arc=none smtp.client-ip=199.89.1.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=acm.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=acm.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=acm.org header.i=@acm.org header.b="FuKmzHxw" Received: from localhost (localhost [127.0.0.1]) by 008.lax.mailroute.net (Postfix) with ESMTP id 4V117C3XMtz6Cnk8s; Thu, 21 Mar 2024 22:57:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=acm.org; h= content-transfer-encoding:content-type:content-type:in-reply-to :from:from:references:content-language:subject:subject :user-agent:mime-version:date:date:message-id:received:received; s=mr01; t=1711061829; x=1713653830; bh=iM2qeI+ui3Vbrt27py8b64OK LBb2MmCyRQfCRIKf4iM=; b=FuKmzHxw5Jxjk4rPcul7KSeqGFDAQpT5K5GDIi5e B70s7YAde0Pjs8Heccm789nqwqZ1rsljO0blxb32XOHHS/rxGaX+XbIlsxOpr+aW HUyG0gSsUAugyuKx2WjlfhSqceAtyJwObmDkVJJtUZMEGTK8bKUSBe50aJCgmsSs Tsri80UCDmMHS9EopksxTRs7CCfouevmoAzZN4bVEHxysmmjvR9ufzYixlcofr2d AJTrXMuNJ90RbuQRDjLXl4Bry8LQMr6/uFEFhoORp+5XG5uCzsj2GnxsDulBpg7h vQoNR28d/uoXzYuzdE88IxzTS4d9muss0aGqvJgWPZlykw== X-Virus-Scanned: by MailRoute Received: from 008.lax.mailroute.net ([127.0.0.1]) by localhost (008.lax [127.0.0.1]) (mroute_mailscanner, port 10029) with LMTP id XusnDFQ3gysA; Thu, 21 Mar 2024 22:57:09 +0000 (UTC) Received: from [192.168.51.14] (c-73-231-117-72.hsd1.ca.comcast.net [73.231.117.72]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: bvanassche@acm.org) by 008.lax.mailroute.net (Postfix) with ESMTPSA id 4V11775CY9z6Cnk8m; Thu, 21 Mar 2024 22:57:07 +0000 (UTC) Message-ID: Date: Thu, 21 Mar 2024 15:57:06 -0700 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] block: Improve IOPS by removing the fairness code Content-Language: en-US To: Jens Axboe Cc: linux-block@vger.kernel.org, Christoph Hellwig , Hannes Reinecke , Ming Lei , Yu Kuai References: <20240321224605.107783-1-bvanassche@acm.org> From: Bart Van Assche In-Reply-To: <20240321224605.107783-1-bvanassche@acm.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 3/21/24 15:46, Bart Van Assche wrote: > There is an algorithm in the block layer for maintaining fairness > across queues that share a tag set. The sbitmap implementation has > improved so much that we don't need the block layer fairness algorithm > anymore and that we can rely on the sbitmap implementation to guarantee > fairness. A regression test is available here: https://github.com/osandov/blktests/pull/135 Bart.