search for: bdflush

...ng routine (intensive harddrive io) freezes every few seconds to flush the cache. Reading this: https://listman.redhat.com/archives/ext3-users/2002-November/msg00070.html I decided to try: # elvtune -r 2048 -w 131072 /dev/sda # echo "90 500 0 0 600000 600000 95 20 0" >/proc/sys/vm/bdflush # run_post_routine # elvtune -r 128 -w 512 /dev/sda # echo "30 500 0 0 500 3000 60 20 0" >/proc/sys/vm/bdflush # sync I like it, but I think that's way too lax and risky - the whole post routine never wrote to disk until I sync'd! But, is there a setting that would ensure rel...

I apologize if this is off-topic, because I'm not sure if /proc/sys/vm/bdflush has anything to do with ext3 performance or not. However, I've been searching around for a while and can't find the answer I need. If somebody could shed some light, I'd really appreciate it. In "Securing and Optimizing Linux: RedHat Edition -A Hands on Guide", the author giv...

Get this warning on bootup ext3 file checks on 2.6.* kernels. Apparently harmless, but how do I fix this? _______________________________________________ debian-knoppix mailing list debian-knoppix at linuxtag.org http://mailman.linuxtag.org/mailman/listinfo/debian-knoppix

...keventd] root 3 0.0 0.0 0 0 ? SWN Aug27 0:00 [ksoftirqd_CPU0] root 4 0.0 0.0 0 0 ? SW Aug27 0:03 [kswapd] root 5 0.0 0.0 0 0 ? SW Aug27 0:00 [kreclaimd] root 6 0.0 0.0 0 0 ? DW Aug27 0:00 [bdflush] root 7 0.0 0.0 0 0 ? DW Aug27 0:00 [kupdated] root 9 0.0 0.0 0 0 ? SW< Aug27 0:00 [mdrecoveryd] root 10 0.0 0.0 0 0 ? SW< Aug27 0:00 [raid1d] root 11 0.0 0.0 0 0 ? SW Aug27 0:02 [kjour...

I'm lacking some understanding of how to tune / when to tune /proc/sys/vm/bdflush Where can I read up on this? Our current problem: Load is low, but ever so often the system decides to do some serious disk I/O which causes all processes to wait for disk I/O -- load explodes (rises linear up into the 20-30ies) just to fall linearly (spelling?) right after that. We think there...

...beneficial in cases where data is being written to and read from disks constantly. Would it be advised to use this data mode in a webserver environment in which there are many virtual hosts(provided the above bug was fixed with the patches)? One last thing is that I have come up with the below bdflush settings based on the filesystem/proc.txt kernel documentation. Combined with data=journal or data=ordered would these settings have any adverse effects on the system? ---- nfract Percentage of buffer cache dirty to activate bdflush...

Hi all, We are observing a consistent interval of about 4 minutes at which there are large sustained writes to disk that causes mysqld to block and not respond for the entire period. We are using data=journal with a 128M journal and the filesystem is 150GB in size. We get about 300kb/sec in writes and that will jump to about 2000kb/sec during the periods of large sustained writes. Those

...777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 net.ipv4.tcp_window_scaling = 1 # vm.max-readahead = ? # vm.min-readahead = ? # HW Controler Off # max-readahead = 1024 # min-readahead = 256 # Memory over-commit # vm.overcommit_memory=2 # Memory to activate bdflush # vm.bdflush="40 500 0 0 500 3000 60 20 0" -------------------------------------------- What's the deal with the options with the "#"? Is the current kernel not supported any more? The ones not commented still work. I did not seem to notice this until migrating settings fro...

...nd will wait for all of them to be written to disc. This can cause my fileserver to pause for a number of seconds while the journal empties, which is very noticable to my customers. There are (were) two easy workarounds for this. 1/ make the journal big enough that it will never fill. 2/ make the bdflush parameters small enough that data gets flushed out quickly enough that the journal never fills. I have chosen the second and it works quite well... until now. As part of fixing the corruption problem and the assertion failure before that I have upgraded my fileservers to 2.4.18-pre9 plus ext3-0...

Hi, I'd like to use a flash drive as a journal device, with the purpose of keeping the main disk drive spun down as long as possible. I have a couple of questions: 1) Does the journaling code spread write accesses to the journal device evenly, as I hope, or are there blocks that are particularly "hot"? I.e., do I have to worry about the flash device dying quickly because of

...your Gigabit/IDE/Fc2? I am facing a similar situation. I am running FC2 with Samba 3.x My problem lies in not that I am limited to 10 MBytes per second sustained. I think it's related to this pdflush and how it's buffers are setup. (I have been doing some research and before 2.6 kernels bdflush was the method that was used and it was tweakable. Have yet to find anything on HOW to tweak pdflush. My issue is that I can copy over the network at 15+ MBytes per second but then after a few minutes it will drop to 4-8 MBytes per second. Yet a drive to drive copy on the linux box itself can su...

Hello All, Wondering what sort of real world mileage people are getting out of different internet connecions - i.e. different DSL connection speeds, cable modems, etc... Is it reasonable to hope to carry 10 - 15 concurrent calls on a 768K DSL? I'm not talking about theoretical BW or looking for any difinitive absolute guarantee... With DSL and Cable - there is no guarantee, so I'm

Maybe I should've started a new thread with this question (it was in the /proc/sys/vm/bdflush thread), so I am now :) According to tests performed for this article: http://www-106.ibm.com/developerworks/linux/library/l-fs8/ "ext3's data=journal mode is incredibly well-suited to situations where data needs to be read from and written to disk at the same time." This is the s...

Hello, as far as I understood ext3 will more or less hog a machine when writing away the journal. A customer is having a slowdown every 5 minues for about 30 seconds, the machine becomes more or less unusable. This is an NFS server serving 300 Gigs spread over 2 NFS shares. I'm wondering what would be the best course of action: a) make the journal bigger? b) make the journal smaller?

SAMBA 2.2.8A I am automounting a 6-in-1 smartmedia reader such as: /etc/auto..master /mnt/auto /etc/auto.misc --timeout=1 /etc/auto.misc carda -fstype=msdos,rw,nosuid,nodev,umask=000 :/dev/sda1 I am also making that a samba share: [card_a] comment = Removable Card Media path = /mnt/auto/carda browseable = yes public = no read only = no

...[3] root 2 0.0 0.0 0 0 ? SW 2004 0:00 [keventd] root 3 0.0 0.0 0 0 ? SWN 2004 0:00 [ksoftirqd_CPU0] root 4 0.0 0.0 0 0 ? SW 2004 0:00 [kswapd] root 5 0.0 0.0 0 0 ? SW 2004 0:00 [bdflush] root 6 0.0 0.0 0 0 ? SW 2004 0:00 [kupdated] root 7 0.0 0.0 0 0 ? SW 2004 0:00 [kjournald] root 20 0.0 0.0 0 0 ? SW 2004 0:00 [kjournald] root 21 0.0 0.0 0 0 ? SW 2004 0:00 [kjournald]...

...8 ? 00:00:03 ksoftirqd_CPU2 ksoftirqd SWN 9 ? 00:00:02 ksoftirqd_CPU3 ksoftirqd SW 10 ? 01:50:36 kswapd schedule_timeout SW 11 ? 00:00:27 kreclaimd kreclaimd RW 12 ? 00:26:38 krefilld - SW 13 ? 00:00:06 bdflush bdflush SW 14 ? 00:10:26 kupdated schedule_timeout SW 15 ? 00:00:00 scsi_eh_0 down_interruptible SW 16 ? 00:00:00 scsi_eh_1 down_interruptible SW 17 ? 00:00:03 kjournald kjournald SW 134 ? 00:00:00 kjou...

Hi all We are implementing samba-ldap to act as an nt pdc and are seeing performance problems. We have a 1ghz, 3gb Ram, 36gb box that is running samba-2.2.5 and openldap-2.0.23 under redhat 7.3 with kernel 2.4.18-3. Clients are all Win2k SP3. All the ldap requests are to the localhost interface. The box is acting as the PDC for the domain, and also sharing diskspace and printers. When we get

...0.0 0:00 keventd 3 root 18 19 0 0 0 SWN 0.0 0.0 0:00 ksoftirqd_CPU0 4 root 9 0 0 0 0 SW 0.0 0.0 0:00 kswapd 5 root 9 0 0 0 0 SW 0.0 0.0 0:00 kreclaimd 6 root 9 0 0 0 0 SW 0.0 0.0 0:00 bdflush 7 root 9 0 0 0 0 SW 0.0 0.0 0:00 kupdated 8 root 9 0 0 0 0 SW 0.0 0.0 0:00 kjournald 85 root 11 0 0 0 0 SW 0.0 0.0 0:00 kjournald 155 root 9 0 628 628 524 S 0.0 0.1 0:00 syslogd 160 root...

...e? or perhaps i have a badly misconfigured server? the drive is 2 x 146GB, RAID 1 using the LSI logic LSI22320-R card. #elvtune /dev/sda /dev/sda elevator ID 1 read_latency: 2048 write_latency: 8192 max_bomb_segments: 6 #cat /proc/sys/vm/bdflush 80 50 0 0 600 10000 80 70 0 Server is running CentOS 3.5; CPU and RAM are very much under utilised. Regards, Wee Cheong