On 03/30/2010 10:50 PM, Rafael J. Wysocki wrote:
> So, I definitely would like to see numbers.

With the patch attached, I get similar results for
uncompressed image -> user.c -> s2disk (compress+threads)
compressed image -> user.c -> s2disk (none of compress+threads)

BUT note that there are differences in pages _copied_ in the "user.c ->
s2disk" phase. Compression was about 40 %. So in the former case 100000
pages went through and in the latter one only ~ 38000. So presumably
there will be savings if the pages are compressed in the kernel in the
save-image phase instead of in userspace.

I'll test (after I hack that up) also the case of image compression when
saving the image and let you know.

It was tested on a machine with openSUSE factory with init 5 with KDE 4.
The memory consumption was ~ 400M (100000 pages) after boot every time.
Hibernation lasted 12-13s in both cases.

-- 
js