Re: ReiserFS v3 + millions of files?

[Hans Reiser <reiser@namesys.com>]

I have unsubstantiated suspicions about VFS/dcache scalability.  It 
would be interesting to try to determine such things as how much of ram 
is consumed by dcache, etc.

Mr. Demidov, how long until sys_reiser4() can be used to create a 
million files sized 60k using lnodes?  It would be an interesting 
benchmarking experiment.....

sys_reiser4() sidesteps dcache....

Hans

Dan Oglesby wrote:

>Greetings...
>
>Long time ReiserFS user, first time I've had a problem.  Signed up for the 
>mailing list last week, and was surprised to see so little traffic (might be 
>a good thing?).
>
>I'm running Red Hat 7.3 using a Red Hat 2.4.20 kernel.  The system has a 
>RAID-5 array via 3Ware 7500 controller, and three Western Digital 120GB 
>"Special Edition" hard drives.  The array is one filesystem, ReiserFS.  The 
>operating system, swap, and other files are stored on a hard drive that is on 
>the primary IDE controller off of the motherboard.
>
>The system is a single board computer, with a P4 3.06 GHz hyperthreaded 
>processor (kernel is SMP enabled), 512MB of RAM, and contains a mix of 
>ReiserFS and EXT2 filesystems on the primary drive (ReiserFS only on the 
>array).  No NFS.
>
>The array is used to store what will basically amount to more than one million 
>files with an average size of sixty kilobytes.
>
>During simulations for file writes, I'm seeing write performance begin to drop 
>dramatically after 800,000 files have been stored on the filesystem.
>
>The filesystem is being mounted with the following options:  
>defaults,notail,noatime,nodiratime
>
>The filesystem was created with default options, basically a "mkreiserfs /dev/
>sda1".
>
>Is this behavior I should expect from ReiserFS v3?
>
>This week I will be switching from a Red Hat kernel to a vanilla kernel (from 
>kernel.org), first the latest 2.4 kernel, then the latest 2.6 kernel.  After 
>that...  I dunno.
>
>Help?
>
>--Dan Oglesby
>
>
>
>  
>


-- 
Hans