Re: [lc-devel] Compressing a page using WKdm

[Nitin G. <nit...@gm...>]

Hi Briglia,


> I have been trying to compress a page using that WKdm code from
> project's CVS. But, something is wrong because the system hangs after
> some compression/decompression pages. I'm using this interface:
> 
> to compress "original_page":
> 
> int len;
> len = WKdm_compress(page_address(original_page), page_address(comp_page), 1024);
> memcpy(page_address(original_page), page_address(comp_page), len);
> 
> to decompress:
> 
> WKdm_decompress(page_address(original_page), page_address(decomp_page), 1024);
> memcpy(page_address(original_page), page_address(decomp_page), PAGE_SIZE);
> 
> Is needed to do some padding? I saw at compress_test module that the
> comp_data is filled with 0's after the compression. Is it necessary?

Yes, WKdm only works when input is exactly 1024 words.
Are you compressing pages with less than page-full of data and still without 
padding?


Cheers,
Nitin