From mboxrd@z Thu Jan  1 00:00:00 1970
From: Oleg Drokin <green@namesys.com>
Subject: Re: Copy time comparison 2.4.20-pre6 <-> 2.4.19+data-logging (was:Compatibility of  current 2.4.19.pending ...)
Date: Sat, 14 Sep 2002 13:02:39 +0400
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To: Manuel Krause <manuel.krause@mb.tu-ilmenau.de>
Cc: reiserfs-list <reiserfs-list@namesys.com>

Hello!

On Sat, Sep 14, 2002 at 01:07:37AM +0200, Manuel Krause wrote:
> >>>So, for the overnight change to pre-kernel 7, where are the new 
> >>>data-logging patches Hans even announced to lkml?
> ??? Hello, Chris!

Chris said he'll either announce something on tuesday or pass the code to me to
finish it.

> Did I follow the thread "Re: [reiserfs-list] [BK] ReiserFS file write 
> bug fix for 2.4" correctly that going to 2.4.20-pre7 that is without 
> file_write (+) code should speed up (in my case copy actions) in 
> comparison to 2.4.20-pre6?

No. file_write code should speed up writes that are done in big chunks (more
than 4k).

> I retested my backup session (see last mail) with 2.4.20-pre7 but have 
> _NO_ ( <0,2% !!!) difference at all.

What tool do you use for backup?
I certainly see the difference when doing
 dd if=/dev/zero of=somefile bs=1024k count=100

also when doing cp bigfile /another_disk/anotherfile

Also very huge difference is seen when creating holes ;)
e.g compare time of seeking to 128Gb and writing one byte between
2.4.20-pre7 and 2.4.20-pre6 ;)
Code for that was once posted on our mailing list.
When you will feel that 2.4.20-pre7 hanged, don't trust that feeling
and wait till the end of operation. ;)

> Have I missed something?

To see the difference you need to fed FS with large chuncks of data.

Bye,
    Oleg