search for: 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 s...

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 s...

This patch add a interface for parameter of cfq driver data. Signed-off-by: Satoshi UCHIDA <s-uchida at ap.jp.nec.com> --- block/cfq-cgroup.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 58 insertions(+), 1 deletions(-) diff --git a/block/cfq-cgroup.c b/block/cfq-cgroup.c index 4938fa0..776874d 1...

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 65536 -t 1 -w 4096 -F > I ran the scr...

Hello, I''ve seen from time to time where a domU using heavy disk I/O can slow down an entire server (including all other domU''s and dom0). Is there a way to schedule or limit this in Xen 3.0.3? Thank you, Brian ** _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

This patch introcude cfq_cgroup structure which is type for group control within expanded CFQ scheduler. In addition, the cfq_cgroup structure has "ioprio" entry which is preference of group for I/O. Signed-off-by: Satoshi UCHIDA <s-uchida at ap.jp.nec.com> --- block/cfq-cgroup.c |...

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...

This patch introduces iprio class for cfq data control layer. By applying this patch, controller can also handle the RT/IDLE properties among groups. Signed-off-by: Satoshi UCHIDA <s-uchida at ap.jp.nec.com> --- block/cfq-cgroup.c | 344 +++++++++++++++++++++++++------------------ include/linux/cfq-iosched.h |...

This patch introduces iprio class for cfq data control layer. By applying this patch, controller can also handle the RT/IDLE properties among groups. Signed-off-by: Satoshi UCHIDA <s-uchida at ap.jp.nec.com> --- block/cfq-cgroup.c | 344 +++++++++++++++++++++++++------------------ include/linux/cfq-iosched.h |...

Hi, all, I just found out that xen assigns the NOOP disk scheduler for linux guest OSes. Dom0 uses cfq scheduler (it is the linux default). Is there a reason for xen to turn off disk request merging in the quest OS by selecting a NOOP scheduler? Is it because the request optimization will be performed in dom0 or VMM ? Thansk in advance, Jia. _______________________________________________ Xen-use...

Hi, If you are not already tired of so many io controller implementations, here is another one. This is a very eary very crude implementation to get early feedback to see if this approach makes any sense or not. This controller is a proportional weight IO controller primarily based on/inspired by dm-ioband. One of the things I personally found little odd about dm-ioband was need of a dm-ioband

Hi, If you are not already tired of so many io controller implementations, here is another one. This is a very eary very crude implementation to get early feedback to see if this approach makes any sense or not. This controller is a proportional weight IO controller primarily based on/inspired by dm-ioband. One of the things I personally found little odd about dm-ioband was need of a dm-ioband

Hi list ! We have a very busy webserver hosted in a clustered environment where the document root and data is on a GFS2 partition off a fiber-attached disk array. Now on busy moments, I can see in htop, nmon that there is a fair percentage of cpu that is waiting for I/O. In nmon, I can spot that the most busy block device correspond to our gfs2 partition where many times, it shows that

...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 System (?) Preemption model (?) IO Scheduler (Anticipatory, Deadline or CFQ?) Flat or Sparse Memory (?) Timer Frequency (100Hz .. 1000hz) Cheers Alan -- The way out is open! http://www.theopensourcerer.com

...n production: 1. Storage/DB - Backend nodes for the application servers, MySQL, NFS storage serving to frontend nodes (deadline?) 2. Web/SSL - Frontend nodes serving up web application (PHP/MYSQL), heavy SSL {en/de}cryption with both HTTPS/Apache as well as branch locations connecting via OpenVPN (cfq?) 3. Telephony/Communications - VoIP, usually Asterisk (full signaling + media services), massive context switching, very timing sensitive (Meetme conferencing, IAX2 trunk mode, etc) (deadline?) In my reading, I've found most people recommend deadline for DB intensive systems. CFQ seems to be...

...stance also has a Local SSD type disk, however, the change in scheduler is not applied. This is a bit academic, because the Local SSD device uses noop by default (somehow, I don?t see any udev rules for setting this outside of my own). But, for instance, if I set the scheduler in the udev rules to ?cfq,? at boot, /dev/sda will use cfq and /dev/sdb will use noop. If I run udevadm trigger after boot, then /dev/sdb will use cfq. So, it appears that at boot time, for some reason, my scheduler is not being applied to /dev/sdb. I?ve tried a handful of things: - changing the o...

...stance also has a Local SSD type disk, however, the change in scheduler is not applied. This is a bit academic, because the Local SSD device uses noop by default (somehow, I don?t see any udev rules for setting this outside of my own). But, for instance, if I set the scheduler in the udev rules to ?cfq,? at boot, /dev/sda will use cfq and /dev/sdb will use noop. If I run udevadm trigger after boot, then /dev/sdb will use cfq. So, it appears that at boot time, for some reason, my scheduler is not being applied to /dev/sdb. I?ve tried a handful of things: - changing the order of my udev rule fil...

...2768 bytes) TCP bind hash table entries: 2048 (order: 2, 16384 bytes) TCP: Hash tables configured (established 4096 bind 2048) TCP reno registered Initializing Cryptographic API io scheduler noop registered io scheduler anticipatory registered (default) io scheduler deadline registered io scheduler cfq registered RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize Xen virtual console successfully installed as xvc0 Event-channel device installed. netfront: Initialising virtual ethernet driver. i8042.c: No controller found. mice: PS/2 mouse device common for all mice TCP bic regis...

Sometime after the x86_64 Xorg and Xfree86 fix, booting on my machine for Xen broke. Using a custom kernel it gets to detecting my IDE chipset and stops right before it should say "Probing IDE interface..." Using the standard kernel it crashes right after "io scheduler cfq registered" is printed. There are no crashes according to the output from the console, although I haven''t compiled in debugging support (I will if suggested to) I am only able to dump the registers from serial line. David _______________________________________________ Xen-devel m...

Hello, I want to install CentOS 4.4 on a Compaq Proliant DL 360. The installation fails just after booting on the first CD. Linux tries to autodetect hardware and fails with the CDROM. Here is the error message: ########################## hdc: CD-224E, ATAPI CD/DVD-ROM drive Using cfq io scheduler ide1 at 0x170-0x177,0x376 on irq 15 ide-cd: cmd 0x5a timed out hdc: lost interrupt ide-cd: cmd 0x5a timed out hdc: lost interrupt CDROM 24x .... ide-cd: cmd 0x25 timed out ########################## I can install a RHEL4 ES on the same server whitout problem. I noticed that CentOS and...