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Date:      Fri, 12 Oct 2001 15:21:10 -0700
From:      "Jay Rossiter" <jrossiter@symantec.com>
To:        Mike Silbersack <silby@silby.com>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: Severe I/O Problems
Message-ID:  <OFECDB86C9.9292A881-ON88256AE3.007AA132@symantec.com>

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     Both.  It does a lot of creation and deletion, and also does quite a
bit of I/O internally to files.

     This is a piece of code that extracts, changes, replaces, deletes, and
repacks archive container files.  (zip, arj, lha, mime, you name it...)




                                                                                                                                               
                    Mike                                                                                                                       
                    Silbersack           To:     Jay Rossiter <jrossiter@symantec.com>                                                         
                    <silby@silby.c       cc:     <freebsd-hackers@freebsd.org>                                                                 
                    om>                  Subject:     Re: Severe I/O Problems                                                                  
                                                                                                                                               
                    10/12/2001                                                                                                                 
                    03:02 PM                                                                                                                   
                                                                                                                                               
                                                                                                                                               





On Fri, 12 Oct 2001, Jay Rossiter wrote:

> There appear to be a lot of changes that went into the filesystem and I/O
> code between 4.3 and 4.4.  A little over a week ago I upgraded my 4.3 box
> to 4.4-STABLE and immediately I started having I/O slowdown.  I do
> development and QA on a program that is very I/O bound, but the changes
> between 4.3 and 4.4 aren't small enough that I can ignore them.

By I/O bound, do you mean that it does a lot of file creation / deletion
or that it does a lot of I/O within a few large files?

Mike "Silby" Silbersack





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