Re: Re: reiserfs do_journal_end unnecessary hd wake up?

[BrÃulio Barros de Oliveira]

just found out! it is konsole, unbelievable! going to file a bug
report right now.
again, thank you very much for the support.
brÃulio

On Thu, Sep 4, 2008 at 8:32 PM, BrÃulio Barros de Oliveira
<brauliobo@xxxxxxxxx> wrote:
> but (as always there is), the situation is not good yet when using kde4.
> with it, i can't find out which process is accessing the hd, cause
> iotop only shows a pdflush access.
> i've tried to kill some apps, but it didn't help. any other trace technic?
>
> regards,
> brÃulio
>
> On Thu, Sep 4, 2008 at 8:28 PM, BrÃulio Barros de Oliveira
> <brauliobo@xxxxxxxxx> wrote:
>> hello mat, here comes the results of each action.
>> in all the process i've used the iotop (what a great utility you
>> pointed!), and always saw only the pdflush process acessing the hd. no
>> user interface were used.
>> the apm is set to 128 with hdparm
>>
>> ok, then try the following:
>>
>> you at least should have noatime,nodiratime,commit=600
>>
>> :) that did the job! also, i've tested without the commit option,
>> which didn't changed the result.
>>
>> enabled for the reiserfs or >=ext3 filesystems
>>
>> you can also try data=writeback (but beware this might put your data at risk !)
>>
>> * can't try
>>
>> select the anticipatory i/o scheduler
>> and set following stuff
>>
>> :( no change.
>>
>> echo "16" > /proc/sys/vm/page-cluster
>> # default: 3
>> #
>>
>> :( no change.
>>
>> echo "60" > /proc/sys/vm/swappiness
>> # default: 60
>> # By default, Linux will aggressively swap processes out of physical memory onto
>> disk in order to keep the disk cache as large as possible.
>> # This means that pages that haven't been used recently will be pushed into swap
>> long before the system even comes close to running out of memory, which is an
>> unexpected behavior compared to some operating systems.
>> # The /proc/sys/vm/swappiness parameter controls how aggressive Linux is in this
>> area.
>>
>> :( no change.
>>
>> echo "3000" > /proc/sys/vm/dirty_expire_centisecs
>> # default: 3000 (30 seconds)
>> #2 how long data can be in the page cache before it is considered expired and
>> must be written at the next opportunity. Note that this default is very long: a
>> full 30 seconds. That means that under normal circumstances, unless you write
>> enough to trigger the other pdflush method, Linux won't actually commit anything
>> you write until 30 seconds later.
>>
>> :( no change.
>>
>> echo "6000"  > /proc/sys/vm/dirty_writeback_centisecs
>> # default: 500 (5 seconds)
>> #1 how often pdflush wakes up to write data to disk. The default wakes up the
>> two (or more) active threads every five seconds.
>> # suggestion: 6000 (every 60 seconds)
>>
>> :( no change.
>>
>> echo "15" > /proc/sys/vm/dirty_background_ratio
>> # default: 10
>> #3 Maximum percentage of active memory that can be filled with dirty pages
>> before pdflush begins to write them
>>
>> echo "50"   > /proc/sys/vm/dirty_ratio #modified
>> # default: 40
>> #4 Maximum percentage of total memory that can be filled with dirty pages before
>> processes are forced to write dirty buffers themselves during their time slice
>> instead of being allowed to do more writes.
>> # modified: 50
>>
>> echo "25" > /proc/sys/vm/vfs_cache_pressure
>>
>> for i in /sys/block/sd*; do
>>        /bin/echo "anticipatory" >  $i/queue/scheduler
>> done
>>
>> for i in /sys/block/sd*; do
>>        /bin/echo "0" >  $i/queue/iosched/antic_expire
>> done
>>
>> for i in /sys/block/sd*; do
>>        /bin/echo "150" >  $i/queue/iosched/read_expire
>> done
>>
>> for i in /sys/block/sd*; do
>>        /bin/echo "750" >  $i/queue/iosched/read_batch_expire
>> done
>>
>> for i in /sys/block/sd*; do
>>        /bin/echo "1200" >  $i/queue/iosched/write_batch_expire
>> done
>>
>> for i in /sys/block/sd*; do
>>        /bin/echo "1024" >  $i/queue/nr_requests
>> done
>>
>> for i in /sys/block/sd*; do
>>        /bin/echo "256" >  $i/queue/read_ahead_kb
>> done
>>
>> for i in /sys/block/sd*; do
>>        /bin/echo "256" >  $i/queue/max_sectors_kb
>> done
>>
>> for i in /sys/class/scsi_host/host*; do
>>        /bin/echo "min_power" >  $i/link_power_management_policy
>> done
>>
>>
>>
>>
>> try to disable each and every unneeded daemon or applets, programs, etc.
>>
>> by using:
>>
>> * powertop
>> * iotop
>> * htop
>> * top
>> * lsof | grep /home
>> * ...
>>
>
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