Hello,
What is COW?
I figured out that every harddisk access is terrible for realtime behavior.
It doesn't matters if the system runs with or without aufs.
The solution is to decrease the priority of the harddisk interrupt and the
thread that is writing the data.
My program has 16 threads and one low prior writes the data of a 3D
Laserscanner onto the harddisk. It doesn't matters if the data is written to
tmpfs or the real disk.
I'm using this script to decrease the priority of the harddisk interrupt:
#!/bin/sh
ps -ef | grep irq/15 | grep -v grep | awk '{ print $2 }' > /dev/null
if [ $? == '0' ]
then
echo "irq/15 changed from -51 to -6"
schedtool -F -p 5 `ps -ef | grep irq/15 | grep -v grep | awk '{ print
$2 }'`
else
echo -e "\033[31m"
echo "hmm, are you working without Harddisk??"
echo "or has it another IRQ as irq/15-ide1?"
echo -e "\033[0m"
fi
-----Original Message-----
From: Jordi Pujol [mailto:[email protected]]
Sent: Dienstag, 17. August 2010 11:09
To: [email protected]
Subject: Re: aufs does not compile with 2.6.33.5-rt23, error in
fs/aufs/super.c:450
A Dimarts 17 Agost 2010 06:32:49, [email protected] va escriure:
> I will add the file aufs2-standalone.git/2.6.33.5-rt25.patch.
Hello,
Also works with other 2.6.33 realtime versions, I think the name could be more
generic, i.e. 2.6.33-rt.patch
Aufs with realtime works fast when COW is on tmpfs, but when COW is on a
disk partition, writing to it becomes very slow, and after a while the
complete OS hangs,
I have tested the version rt25, and others also, all have the same problem,
in a Live system where the root filesystem is an aufs COW on a disk partition,
Here Is a Debian source package to build the last kernel that I used,
http://livenet.selfip.com/ftp/debian/linux-2.6/linux-2.6.33-7.rt29.jpp.3-lnet/
Regards,
Jordi Pujol
Live never ending Tale
GNU/Linux Live forever!
http://livenet.selfip.com
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