How to decrease the delay to flush write buffer

How to decrease the delay to flush write buffer

[Peter Menzebach]

Hi,
I am using jffs2 on Atmel dataflash. I encounter sometimes errors like 
"Empty flash at 0x004a7814 ends at 0x004a79c0" and "read_dnode: header 
CRC failed on node at 0x63d670: read 0xffffffff, calculated 0x8f83d3bc".
My guess at the moment is, that this happens at unclean reboots (power 
off), where the write buffer is not flushed. For dataflash 
CONFIG_JFFS2_FS_WRITEBUFFER is mandatory.

For my purpose this would be avoided more or less completely, if the 
write buffer would be flushed after a delay of some 100 ms instead of 
some seconds. How can I reduce this timer?

Best regards
Peter



-- 
Peter Menzebach
Menzebach und Wolff IT-Consulting GbR
Phone +49 751 355 387 1

Re: How to decrease the delay to flush write buffer

[Josh Boyer]

On 11/21/05, Peter Menzebach <pm-mtd@mw-itcon.de> wrote:
> Hi,
> I am using jffs2 on Atmel dataflash. I encounter sometimes errors like
> "Empty flash at 0x004a7814 ends at 0x004a79c0" and "read_dnode: header
> CRC failed on node at 0x63d670: read 0xffffffff, calculated 0x8f83d3bc".
> My guess at the moment is, that this happens at unclean reboots (power
> off), where the write buffer is not flushed. For dataflash
> CONFIG_JFFS2_FS_WRITEBUFFER is mandatory.
>
> For my purpose this would be avoided more or less completely, if the
> write buffer would be flushed after a delay of some 100 ms instead of
> some seconds. How can I reduce this timer?

http://linux-mtd.infradead.org/faq/jffs2.html

Read "How is ensured, that data is written to flash ?"

josh