On Wed, Jan 08, 2020 at 11:51:03AM +0100, Mikhail Zaslonko wrote: > In order to benefit from s390 zlib hardware compression support, > increase the btrfs zlib workspace buffer size from 1 to 4 pages (if > s390 zlib hardware support is enabled on the machine). This brings up > to 60% better performance in hardware on s390 compared to the PAGE_SIZE > buffer and much more compared to the software zlib processing in btrfs. > In case of memory pressure, fall back to a single page buffer during > workspace allocation. > The data compressed with larger input buffers will still conform to zlib > standard and thus can be decompressed also on a systems that uses only > PAGE_SIZE buffer for btrfs zlib. > > Signed-off-by: Mikhail Zaslonko <zaslonko@xxxxxxxxxxxxx> Reviewed-by: David Sterba <dsterba@xxxxxxxx>
