Ext3 users - Jun 2003 - boot: ext3 fs not supported by kernel

I am running 2.4.18-3.
I am getting terrible performance. I noticed in the boot.log that my / fs is
ext3 and my kernel does not support ext3. I have tried to recompile the kernel
with ext3 support. It did not seem to work. (e.g. lags for 40 or so when i am
unzipping multiple files)
Firstly, is this likely to be the case of my problems?
How can i fix it? Do I just recompile the kernel or do I need to install some
modules?
thanks if you can help.
Pete

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Peter Davies wrote:
> I am running 2.4.18-3.
What kind of kernel is this? One from RedHat?
> I am getting terrible performance. I noticed in the boot.log that my /
> fs is ext3 and my kernel does not support ext3. I have tried to
If this is a RedHat kernel and you didn't recompile it, than it definitly
has ext3 support. What makes you believe that it doesn't have ext3 support?
> recompile the kernel with ext3 support. It did not seem to work. (e.g.
> lags for 40 or so when i am unzipping multiple files) Firstly, is this
> likely to be the case of my problems? How can i fix it? Do I just
> recompile the kernel or do I need to install some modules?
It might be just simplier:
Do you have DMA turned on for your hard disks? Check with
'hdparm -v /dev/hda' and look for 'using_dma'.

Refards,
Juri

Thanks Juri and Theodore

>For some silly reason ext3 is a module in many (all?) Red Hat kernels.  
>Try running mkinitrd, and that might just solve the problem for you by
>including the ext3 module in the initial ramdisk.

I have sorted the problem with the kernel. I had tried to recompile it
unecessarily as the original (RedHat 7.3) installation did have ext3 support. I
did not do the mkinitrd properly so the ext 3 module wasnt loading as you
suggested.

> It might be just simplier:
> Do you have DMA turned on for your hard disks? Check with
> 'hdparm -v /dev/hda' and look for 'using_dma'.
I have also switched using_dma on (hdparm -d1 /dev/hda).

It is running better, but still not smoothly (lags at the console and mouse
movments on the desktop have decreased to <1 - 2 seconds).

I have seen other people in previous postings with slow I/O problems. (I am not
running a server, but I do run run samba to mount network windows shares). I do,
however, run satellite data processing programs which read/write a lot of data.

I have set up this software previously on another machine (Athlon XP 1800)and it
ran very well.

Perhaps it is this particular RH installation from the Linux Bible (Wiley). My
previous installation was from a PC MAG (NEXT Handbooks) release. I assumed they
were the same.

So where to next?

Pete


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