similar to: Scheduler Elevator Deadline

Hi! I''m trying to figure out what would be the best io elevator/scheduler for dom0. As far as I know, each domU virtual disk device is seen as single process in dom0.. correct? Then, say, I have domU with 3 devices (sda1,sda2,sda3).. and I access all of those 3 devices in domU.. that would make 3 processes doing io in dom0? elevator=cfg would be a good pick to share the io load

Can anyone explain how the disk elevator works and if there is anyway to tweak it? I have an email server which likely has a large number of read and write requests and was wandering if there was anyway to improve performance. Matt

I understand Oracle currently recommends using the deadline scheduler because of a bug in cfq. In reading a recent thread on nahant- list at redhat.com, using the deadline scheduler on an NFS server reduced IO wait significantly. Also, the description of the deadline scheduler sounds like it would be ideal for databases. Does Oracle have any recommendation wrt. sticking with the deadline

Greetings all- I'm on a quest to do some serious tuning to some of my production systems. All are on CentOS 5.x ranging from 5.0 to 5.4. I've been reading up on the various IO schedulers available in the kernel and I'm hoping some of you can lend some insightful suggestions. I typically have three classes of system in production: 1. Storage/DB - Backend nodes for the application

This patchset expands traditional CFQ scheduler in order to support cgroups, and improves old version. Improvements are as following. * Modularizing our new CFQ scheduler. The expanded CFQ scheduler is registered/unregistered as new I/O elevator scheduler called "cfq-cgroups". By this, the traditional CFQ scheduler, which does not handle cgroups, and our new CFQ

This patchset expands traditional CFQ scheduler in order to support cgroups, and improves old version. Improvements are as following. * Modularizing our new CFQ scheduler. The expanded CFQ scheduler is registered/unregistered as new I/O elevator scheduler called "cfq-cgroups". By this, the traditional CFQ scheduler, which does not handle cgroups, and our new CFQ

Hi Jeff, On 07/03/2010 03:58 AM, Jeff Moyer wrote: > Hi, > > Running iozone or fs_mark with fsync enabled, the performance of CFQ is > far worse than that of deadline for enterprise class storage when dealing > with file sizes of 8MB or less. I used the following command line as a > representative test case: > > fs_mark -S 1 -D 10000 -N 100000 -d /mnt/test/fs_mark -s

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi everyone, I found an article about libvirt, and one thing that I have not seen anywhere else: > IMPORTANT: If you boot a Linux VM, you might want to add > “elevator=noop” to your Linux boot command line to force the disk > scheduler to let the host machine handle the disk writes > reorganisations (like tunnelling tcp over tcp, it

Hello, I'd like to set the io scheduler on some of the disks on our Dom0 (CentOS 5) to "deadline". The way I found to do this is with "echo deadline > /sys/block/sdb/queue/scheduler". What is the Right Way(TM) to set this automatically during boot? I sort of expected to use sysctl but it appears to only deal with pseudo-files under /proc/sys, not /sys. Also

CALL FOR PAPERS / PARTICIPATION Submission deadline: December 1st At FOSDEM 2014, LLVM will for the first time participate with a dedicated devroom. Complementing the upcoming Euro LLVM 2014, the devroom at FOSDEM provides a great opportunity for core LLVM developers and the wider open source community to get together, connect and discuss. As possibly the largest European Open Source

Hi. I'm running RHEL4 for my test system, Adaptec Firewire controllers, Maxtor One Touch III shared disk (see the details below), 100Mb/s dedicated interconnect. It panics with no load about each 20 minutes (error message from netconsole attached) Any clues? Yegor --- [root at rac1 ~]# cat /proc/fs/ocfs2/version OCFS2 1.2.0 Tue Mar 7 15:51:20 PST 2006 (build

Hi all, I order to reach maximum performance on my centos kvm hosts I have use these params: - On /etc/grub.conf: kernel /vmlinuz-2.6.18-164.11.1.el5 ro root=LABEL=/ elevator=deadline quiet - On sysctl.conf # Special network params net.core.rmem_default = 8388608 net.core.wmem_default = 8388608 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216

Hi, I'm building a test asterisk server and building the latest kernel I got to wonder if there are any specific recommendations about schedulers and so forth for optimum performance. There are a few areas that raise questions in my mind and I wonder if anyone has any opinions/comments on which settings are most suitable for use with asterisk: SLAB Allocator (SLAB or SLUB?) Tickless

Salford Data Mining Conference August 23rd - 25th, 2009 San Diego, California Early-Bird Registration Deadline: July 24th, 2009 http://SalfordDataMining.com/agenda.php Post-Conference Training August 26th - 28th, 2009 Our conference will offer prominent keynote speakers and informative real world application solutions. Conference topics include: * What Data Mining Has to Say About the

Convert the S_<FOO> symbolic permissions to their octal equivalents as using octal and not symbolic permissions is preferred by many as more readable. see: https://lkml.org/lkml/2016/8/2/1945 Done with automated conversion via: $ ./scripts/checkpatch.pl -f --types=SYMBOLIC_PERMS --fix-inplace <files...> Miscellanea: o Wrapped modified multi-line calls to a single line where

Convert the S_<FOO> symbolic permissions to their octal equivalents as using octal and not symbolic permissions is preferred by many as more readable. see: https://lkml.org/lkml/2016/8/2/1945 Done with automated conversion via: $ ./scripts/checkpatch.pl -f --types=SYMBOLIC_PERMS --fix-inplace <files...> Miscellanea: o Wrapped modified multi-line calls to a single line where

Dear R-help members, This message is to remind you that the submission deadline for abstracts for the R User Conference, useR! 2010, is one week away: Submission deadline: Monday, March 1, 2010 The deadline for early registration is also Monday, March 1, 2010. I encourage you all to submit abstracts (to give a presentation, or to present a poster). More information regarding the

What, the deadline is tomorrow?!? The deadline for proposals snuck up on me, and I'm sure many of you forgot as well. Therefore, I am extending the deadline. I have received some great talk proposals, so keep them coming. However, I have very few tutorials, BoFs, posters, or lightening talk proposals. So please, get those proposals in and lets make this year the best developer meeting yet!

# Error facing :------ kernel panic - : not syncying , VFS : Unable to mount root fs on un-known block (3,5) ------------------------------------------------------------------------------------------------------ # Machine and kernel architecture:----------- Default Working installed kernel - vmlinux-2.6.5-7.97 Xen dom0 kernel - vmlinuz-2.6.12.6-xen0

The deadline for student applications is 19:00 UTC on Friday 6th April: http://www.google-melange.com/gsoc/events/google/gsoc2012 That's just over 36 hours away as I write this. The deadline is sharply enforced by the melange software, and you won't get an extension, so don't leave it until the last few seconds, as you might have an unexpected internet outage. There's also no