Linux block nr_requests

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(It could start with 'nr_requests', where I think the default value is generally regarded as too low for 'enterprise' set-ups.) Comment 15 Ben Marzinski 2011-08-14 20:32:30 UTC I've back-ported the upstream patch. In general, the BeeGFS metadata service can use any standard Linux file systems. However, ext4 is the recommended file system for disk partitions of metadata targets, because it handles small file workloads (common on a BeeGFS metadata server) significantly faster than other local Linux file systems.

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Linux 内核中的 block I/O 层又是非常重要的一个概念,它相对字符设备的实现来说复杂很多,而且 struct request_queue *q; sector_t old_sector; int ret, nr_sectors = bio_sectors(bio); dev_t old_dev; int err = -EIO; might_sleep(); if (bio_check_eod(bio, nr_sectors)) goto end_io
113 114 nr_requests (RW) 115----- 116 This controls how many requests may be allocated in the block layer for 117 read or write requests. Note that the total allocated number may be twice 118 this amount, since it applies only to reads or writes (not the accumulated 119 sum).
commit de55a8958f6e3ef5ce5f0971b80bd44bfcac7cf1 Merge: 79b520e 0672453 Author: Linus Torvalds Date: Thu Sep 17 09:55:52 2009 -0700 Merge branch 'for-linus' of git ...
Clearly, a block driver must eventually provide some mechanism for actually doing block I/O to a device. In Linux, the method used for these I/O Handling Requests: A Simple Introduction. The most important function in a block driver is the request function, which performs the low-level operations...
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linux-image-unsigned-4.18.0-24-lowlatency - Linux kernel image for version 4.18.0 on 64 bit x86 SMP
nr_requests to 512 makes this go away .. That shouldn't be necessary though. I only see this with LVM over 3ware-raid5, not on the 3ware-raid5 array directly (/dev/sda1). And it gets less troublesome with a lot of debugging (unless I set nr_requests lower again), which points to a timing issue.
linux的nvme驱动参数调优 ... 47 nr_requests -rw-r--r-- 1 root root 4096 Dec 19 ... the block layer will migrate request completions to the cpu "group" that ...
# fdisk -l Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x15741573 Device Boot Start End Blocks Id System /dev/sda1 1 7 56196 16 Hidden FAT16 /dev/sda2 * 8 14 56227+ 6 FAT16 /dev/sda3 15 21 56227+ 16 Hidden FAT16 /dev/sda4 22 38913 ...
其中fd对应进程的file结构, buf指向写入的数据。内核从cache中找出与被写文件相应的物理页,write决定写内存的第几个页面,例如"echo 1 > a.out"(底层调用write)写入的是a.out文件的第0个位置,write将写相应内存的第一页。
Queue lock must be held. 00362 **/ 00363 void blk_start_queue(struct request_queue *q) 00364 { 00365 WARN_ON(!irqs_disabled()); 00366 00367 queue_flag_clear(QUEUE_FLAG_STOPPED, q); 00368 blk_invoke_request_fn(q); 00369 } 00370 EXPORT_SYMBOL(blk_start_queue); 00371 00372 /** 00373 * blk_stop_queue - stop a queue 00374 * @q: The &struct request ...
the changes are quite noticable (less waiting times / latency when browsing the web [where it's the most noticable]) cfq focuses more on async workloads now - I figured that in the most seldom cases (at least for me) things are aligned & accessed synchronously / properly
From:: Jens Axboe <[email protected]> To:: Linux Kernel <[email protected]> Subject: [patch] deadline-ioscheduler rb-tree sort: Date:: Thu, 31 Oct 2002 14:43 ...
This potentially causes hangs if the users changes the depth of the scheduler map, by writing to the 'nr_requests' sysfs file for that device. Add a blk-mq-sched hook that allows blk-mq to inform the scheduler if the depth changes, so that the scheduler can update its internal state.
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Queue lock must be held. 00362 **/ 00363 void blk_start_queue(struct request_queue *q) 00364 { 00365 WARN_ON(!irqs_disabled()); 00366 00367 queue_flag_clear(QUEUE_FLAG_STOPPED, q); 00368 blk_invoke_request_fn(q); 00369 } 00370 EXPORT_SYMBOL(blk_start_queue); 00371 00372 /** 00373 * blk_stop_queue - stop a queue 00374 * @q: The &struct request ...
linux磁盘调度 Linux下io磁盘调度策略及配置. 发布时间:2017-04-18 来源:服务器之家
Linux 磁盘 I/O 调优. 一、 概述 1. 磁盘调优目录: /sys/block 2. 磁盘调优均是调内核参数,要求安装 kernel-doc 包, 3. 调预先读请求量(默认为 128kb )
Sun Flash Accelerator F40 PCIe Card is a block device optimized for 8K block sizing and alignment (consistent with that of Oracle databases). This section explains actions you can take to tune the card for maximum performance in an Oracle Linux environment with Unbreakable Enterprise Kernel.

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Nov 21, 2019 · Date: Thu, 21 Nov 2019 16:55:31 +0800: From: Ming Lei <> Subject: Re: [PATCH RFC V2 3/5] blk-mq: Facilitate a shared sbitmap per tagset
LXR linux/ block/ blk-core.c ... 1173} 1174 1175int blk_update_nr_requests(struct request_queue *q, unsigned int nr) 1176{ 1177 struct request_list *rl; ...
How to optimize the Linux kernel disk I/O performance with queue algorithm selection, memory management and cache tuning. Two queues are maintained per device, one sorted by sector and the other by deadline. As long as no deadlines are expiring, the I/O requests are done in sector order to...
* Linux * drm/i915: Fix FDI M/N setting according with correct color depth ... check for rfkill hard block at load time ... don't assume device has a request ...
Как установить python3-requests в Ubuntu / Debian. Установка
Linux block drivers can do their job by providing a function that the kernel will call if it needs to do IO on the device. The first method described in LDD3 was the "request" method. According to this, the driver had to provide a function (wich was called the "request" function after the name of the field in a struct that is registered with ...
Btrfs is an open-source, general-purpose file system for Linux. The name derives from the use of B-trees to store internal file system structures. Different names are used for the file system, including “Butter F S” and “B-tree F S.” Development of Btrfs began at Oracle in 2007, and now a number of companies (including Red Hat, Fujitsu, Intel, SUSE, and many others) are contributing to ...
By default with RHEL 6/5, this value is set to 128. Increasing this to a larger size may result in higher read throughput performance. 6.3.3 nr_requests This value is used by the Linux kernel to set the depth of the request queue and is often used in conjunction with changes to the queue depth configuration of the HBA.
Apr 29, 2009 · Linux I/O scheduler also has a functionality to sort incoming I/O requests in its request-queue for optimization. Queue size is configurable. Queue size is defined as "/sys/block/sdX/queue/nr_requests" then you can change queue length as follows. # cat /sys/block/sda/queue/nr_requests 128 # echo 100000 > /sys/block/sda/queue/nr_requests
Ustawienie daty i godziny przez powłokę na systemach Linux / Zmiana limitu nr_requests dla dysków HDD / Dodawanie repozytorium w systemie Debian 9 / Włączanie automatycznej aktualizacji systemu Debian 9 / Wyłączenie tx-checksumming w Linux - Debian 8 / Sprawdzanie poziomu entropii w Linuxie / Forward klucza SSH na systemy Linux Debian /
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Sep 23, 2011 · This is dedicated to the linux users, system admins, open source enthusiastic, techs whoever is looking for solution, tricks &amp; concept etc. Reader will apply concept or execute command at their own risk. Owner of these article is not responsible for any impact, damages or errors.
Apr 14, 2016 · The Linux block layer. If at any point there are more than 128 outstanding requests (configurable) per disk, the Linux block layer will just stop accepting requests and go into synchronous wait before new requests can be queued. This can be probed and configured in the following sysfs file: $
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Jun 12, 2008 · echo 1024 > /sys/block/sda/queue/read_ahead_kb. echo 256 > /sys/block/sda/queue/nr_requests. Reboot your system. Step 4 (Optional) : If you are using ext3as your filesystem, you may consider to add “noatime” to the /etc/fstabfor every entry of partitions or hard drives before “relatime“.

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