From patchwork Fri May 31 07:47:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 801060 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 1636D770EE; Fri, 31 May 2024 07:48:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717141738; cv=none; b=jSmhOGPPEq3PPFhDfgp720ctJcryM0OSt6cgSOm2q4//T57g+21n3IfppfkWANqfsjBE4nzgyIovOiFmjY+Sp/2uvwQPfyH2XYv6/DMPhOfJwT4RB+nR64haYqZ4YztGmqzdAIvz22P0Pag1sLIM9Fhhy7JxX/zgR0xVH11wGY0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717141738; c=relaxed/simple; bh=p/E9HpdBg2UQgknNtgIi3vtLTqwRaCIQ8zlRIQfAFV4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HZTnOYxpHmx1CJNc2wPU0o5j2e3/+n6+lCQRB6dXxbrfEyXA06r7uUgz1zDEVpVC11Lu10Tv2GwG0KDZ80TtDkLQjylGwBH+wv1zPFcR+YFMFzaxcTbhCFvCtuUqB2tU98yocR2t4X0t20gXhZLDirS50kWwAs4xpU3NpUOym/g= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=NQeQhA2U; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="NQeQhA2U" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=0q2p+u53R9YY1ujQIkkIYHdGljvaoYfmRjVYZa1pGUw=; b=NQeQhA2UOUYImH9TH8f84PjtdO ObERM3qoC8ul3CKlxRBe0dwRdXaSSfDKIuJPDJKIXddbCk4DuIEOabi0xeClPM4iSB5KZs7KRVBke QXuG41cYK3YbO5bkABYuBrfzr2b20SayGqug5sRun1euqWYw8yIMYgwVe7df1qO/MfVZyOgF1Y4jH 8S8LuTfmFWj0aSfI2cvZCNBbal2QtT+CQ6/gS37bIRRARF26B6AGUCKpsAA2d+30Zq8U6sLyU8dBv Bk3tXLY8MqgLz5OO3tA8AK0iTNwDc6TpStdHEqtPrSKHpQTid5SoU4/Ug1OFPywaZgXzR2J5gCky/ tKVHxQ0Q==; Received: from 2a02-8389-2341-5b80-5ba9-f4da-76fa-44a9.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:5ba9:f4da:76fa:44a9] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sCx0N-00000009XXW-22Ka; Fri, 31 May 2024 07:48:52 +0000 From: Christoph Hellwig To: Jens Axboe , "Martin K. Petersen" Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , Josef Bacik , Ilya Dryomov , Dongsheng Yang , =?utf-8?q?Roger_Pau_Monn?= =?utf-8?q?=C3=A9?= , linux-um@lists.infradead.org, linux-block@vger.kernel.org, nbd@other.debian.org, ceph-devel@vger.kernel.org, xen-devel@lists.xenproject.org, linux-scsi@vger.kernel.org Subject: [PATCH 03/14] rbd: increase io_opt again Date: Fri, 31 May 2024 09:47:58 +0200 Message-ID: <20240531074837.1648501-4-hch@lst.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240531074837.1648501-1-hch@lst.de> References: <20240531074837.1648501-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Commit 16d80c54ad42 ("rbd: set io_min, io_opt and discard_granularity to alloc_size") lowered the io_opt size for rbd from objset_bytes which is 4MB for typical setup to alloc_size which is typically 64KB. The commit mostly talks about discard behavior and does mention io_min in passing. Reducing io_opt means reducing the readahead size, which seems counter-intuitive given that rbd currently abuses the user max_sectors setting to actually increase the I/O size. Switch back to the old setting to allow larger reads (the readahead size despite it's name actually limits the size of any buffered read) and to prepare for using io_opt in the max_sectors calculation and getting drivers out of the business of overriding the max_user_sectors value. Signed-off-by: Christoph Hellwig Reviewed-by: Martin K. Petersen --- drivers/block/rbd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 26ff5cd2bf0abc..46dc487ccc17eb 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -4955,8 +4955,8 @@ static int rbd_init_disk(struct rbd_device *rbd_dev) struct queue_limits lim = { .max_hw_sectors = objset_bytes >> SECTOR_SHIFT, .max_user_sectors = objset_bytes >> SECTOR_SHIFT, + .io_opt = objset_bytes, .io_min = rbd_dev->opts->alloc_size, - .io_opt = rbd_dev->opts->alloc_size, .max_segments = USHRT_MAX, .max_segment_size = UINT_MAX, };