Re: Can I turn off sparse file support + file extent questions

From: Eric Taylor (et2_at_rocketship1.com)
Date: 11/18/05 

Date: Fri, 18 Nov 2005 07:58:30 -0800

Sorry, you seemed so knowledgeable about file systems.

One last follow-up.

Can you explain why once the ext3 system would write
10x slower, it would continue to do so even as the file
which was being extended was not picking further large
fragmentation. And…

If I restarted my test program, overwrote the file up to
the point I had left off, and then continued writing, and
extended the file further, it would NOT run 10x slower as
long as no further large fragmentation was occurring on
the file extensions.

This behavior seems like a bug to me.

Also, after switching to ext2, I still can get a crash using
a tmpfs ramdisk.

Using my redhat rhel4 2.6 kernel (latest rhel4 update, with
the hugemem kernel.) Here’s what I do:

create a 7 gig tmpfs and attach as a leaf node to my ext2
filesystem. (a 12 gig system)

Write my 2 gig checkpoint to the ramdisk. Then use mv
to move it from the ramdisk to the ext2 hardisk. As
I do this, I see my free memory reduced. After about 3 or 4
repeats of this, the system crashes.

I’ve run this on a 2.4 system with no ill effects.

So, it’s not ext3 causing this problem. I will be next
installing a rhel3 partition so I can dual boot back to
a 2.4 kernel on this hardware, just to make certain it’s
not a hardware problem.

John Reiser wrote:

> > Ahhhh, you must be the Reiser of the ReiserFS fame!
>
> ReiserFS is by someone else: Hans Reiser and Namesys.
>
> --

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