Performance of the MTD device and JFFS2

Performance of the MTD device and JFFS2

[Vahid Fereydunkolahi]

Hi All,
 I have just checked out the latest version of the MTD
and JFFS2 from the
":pserver:anoncvs@cvs.infradead.org:/home/cvs". I
noticed that the mount/read/write operations on
"mtdblock"s are much slower than the version I checke
out 4 to 5 month ago.

Anybody has any information in this regard?

--vahid


	
		
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Re: Performance of the MTD device and JFFS2

[Artem B. Bityuckiy]

On Thu, 20 Jan 2005, Vahid Fereydunkolahi wrote:

> Hi All,
>  I have just checked out the latest version of the MTD
> and JFFS2 from the
> ":pserver:anoncvs@cvs.infradead.org:/home/cvs". I
> noticed that the mount/read/write operations on
> "mtdblock"s are much slower than the version I checke
> out 4 to 5 month ago.
> 
> Anybody has any information in this regard?
Think would be nice to come with digits.
Try to profile it.

> 
> --vahid
> 
> 
> 	
> 		
> __________________________________ 
> Do you Yahoo!? 
> Yahoo! Mail - You care about security. So do we. 
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> 
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
> 

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

Re: Performance of the MTD device and JFFS2

[Vahid Fereydunkolahi]

I erased the whole flash. I copied a 500KB file to the
NAND flash. Then I copied the file from the NAND flash
to the same directory with different name. This means
read and write operation on empty flash. With the old
version it takes around 2 seconds, with the new
version it takes more than 12 seconds (I am using the
ZLIB for compression).

I wish I had the version iformation of the old MTD and
JFFS2, but I do not (It should be from 4 month ago).

--vahid


> Think would be nice to come with digits.
> Try to profile it.




		
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Re: Performance of the MTD device and JFFS2

[Artem B. Bityuckiy]

On Fri, 2005-01-21 at 10:17 -0800, Vahid Fereydunkolahi wrote:
> I erased the whole flash. I copied a 500KB file to the
> NAND flash. Then I copied the file from the NAND flash
> to the same directory with different name. This means
> read and write operation on empty flash. With the old
> version it takes around 2 seconds, with the new
> version it takes more than 12 seconds (I am using the
> ZLIB for compression).
> 
> I wish I had the version iformation of the old MTD and
> JFFS2, but I do not (It should be from 4 month ago).
> 
> --vahid
> 
Sorry Vahid, don't know what happened. May only suggest:
1. Check may be your NAND flash driver has degraded. Why do you think
the reason is JFFS2?
2. Try to profile your linux system.
3. Try to find your old linux..

Re: Performance of the MTD device and JFFS2

[Vahid Fereydunkolahi]

I am using the same Linux kernel for both: Linux
2.4.17. The components that are changed are MTD and
JFFS2 (I ported them to Linux 2.4.17).

--vahid

> Sorry Vahid, don't know what happened. May only
> suggest:
> 1. Check may be your NAND flash driver has degraded.
> Why do you think
> the reason is JFFS2?
> 2. Try to profile your linux system.
> 3. Try to find your old linux..
> 
> 
> 
> 



		
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