[PATCH] libmisc/untar: Use a larger block size to read and write files

[Chris Johns]

On 1/4/2022 2:27 pm, Joel Sherrill wrote:
> On Thu, Mar 31, 2022, 10:17 PM Chris Johns <chrisj at rtems.org
> <mailto:chrisj at rtems.org>> wrote:
>     On 1/4/2022 11:14 am, Joel Sherrill wrote:
>     > This looks ok. Does it impact any array declaration that I missed? I'm just
>     > worrying about changes in stack consumption.
> 
>     Not that I could see. A buffer allocated on the heap is now bigger to hold the
>     larger data block and that has been adjusted.
> 
> Ok. That's there only issue I had.
> 
>     I have an application where the JFFS slowed down from 4.11 to 6 and the only
>     difference I could see was 6 had a lot more, I would say 50%, small blocks being
>     written to the flash device over 4.11. This change makes using untar on JFFS
>     much more efficient.
> 
> That's odd by itself to have more smaller blocks but great to get the
> performance boost.

The JFFS is compressing and with 512 byte blocks to work with you get a lot of
small blocks. In production on 4.11 some of the files are AES encrypted and they
do not compress so it is not as noticeable.

Chris