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SubjectRe: [PATCH v4] btrfs: Use larger zlib buffer for s390 hardware compression
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@linux.ibm.com>

Reviewed-by: David Sterba <dsterba@suse.com>

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