how to behave on jffs2

how to behave on jffs2

[Lokesh Kumar]

Hi All,

I have an embedded Linux (kernel 2.4.18) board at 50MHz, with jffs2 16MB
flash. My system creates small files of 700 bytes each and is required to
create ~3000 of such files. I see that when there are 1000 files, the system
takes 3 minutes or so to mount this partition and then another 3 to do "ls
-l". When there are 3000 files, the system takes 10 minutes each for mount
and "ls -l". 

Is that expected behaviour?

Lokesh Kumar

Re: how to behave on jffs2

[Carlos Manuel Duclos Vergara]

> Hi All,
>

Hi,

> I have an embedded Linux (kernel 2.4.18) board at 50MHz, with jffs2 16MB
> flash. My system creates small files of 700 bytes each and is required to
> create ~3000 of such files. I see that when there are 1000 files, the
> system takes 3 minutes or so to mount this partition and then another 3 to
> do "ls -l". When there are 3000 files, the system takes 10 minutes each for
> mount and "ls -l".
>

Why not to create a ramdisk and mount it on the fly?
Only when you modify the ramdisk you save it to the flash, instead of been 
working directly with flash memory. You can save a lot of time by doing this.

Cheers!

-- 
Carlos Manuel Duclos Vergara
carlos@embedded.cl
http://www.embedded.cl

Re: how to behave on jffs2

[Artem B. Bityuckiy]

On Wed, 12 Jan 2005, Lokesh Kumar wrote:

This is feature of JFFS2. It works slow with directories which have lots 
of files. If you want to fix it, I may try to take you some hints :-)


> Hi All,
> 
> I have an embedded Linux (kernel 2.4.18) board at 50MHz, with jffs2 16MB
> flash. My system creates small files of 700 bytes each and is required to
> create ~3000 of such files. I see that when there are 1000 files, the system
> takes 3 minutes or so to mount this partition and then another 3 to do "ls
> -l". When there are 3000 files, the system takes 10 minutes each for mount
> and "ls -l". 
> 
> Is that expected behaviour?
> 
> Lokesh Kumar
> 
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
> 

--
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.

Re: how to behave on jffs2

[Wolfgang Denk]

In message <294FD9D3403A0340BDAC38E48DCEFFDC935788@RES-EXCH> you wrote:
> 
> I have an embedded Linux (kernel 2.4.18) board at 50MHz, with jffs2 16MB
> flash. My system creates small files of 700 bytes each and is required to
> create ~3000 of such files. I see that when there are 1000 files, the system
> takes 3 minutes or so to mount this partition and then another 3 to do "ls
> -l". When there are 3000 files, the system takes 10 minutes each for mount
> and "ls -l". 
> 
> Is that expected behaviour?

Yes - given the age of MTD code you probably have in this old kernel.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
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