dan...@zoltak.com:
> I will try to be concise with my answers.
:::
> The following translates to:
> compiled without: debug support, hardening support, inotify support,
> nfs export support
:::
> The Apache 2.2 processes appear to be running hotter when AUFS is the root FS.
Thak you for good detailed descriptions.
What is "hardening support?"
So you have four (or more) apache processes, and four of them are
(almost) always busy. Right?
I don't see anything wrong in your apache_strace.txt.
Do you think they are slow and the load ave stays high? If so, I'd
suggest you to add -T to strace which prints the time spent in each
systemcall and compare the aufs case and the non-aufs case.
Note that, as you might know, aufs is surely an overhead. It may access
two filesystems where non-aufs case accesses only one. But I am not sure
this is the main reason of your load average.
> Running the new version I can see the following in the dmesg output:
>
> aufs au_new_inode:412:updatedb[8984]: Warning: Un-notified UDBA or
> repeatedly renamed dir, b1, nfs, it_CH.pm, hi26471003, i207062.
:::
> Could this be related to the problem?
Currently I think these messages are unrelated.
But if the messages are producued so heavily, then you may feel that
your system is busy at printing messages and the neccessary work (apache
server) is not scheduled well. How often the message is printed?
If you make changes on your nfs server
(10.196.150.1:/vol/filerboot_rw/linux/images/image-gentoo-public-dracut)
so often, then the message will be printed and it may keep aufs on nfs
client busy, and it will lead to the high load average.
J. R. Okajima
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