Messages in this thread | | | Subject | Fwd: Re: [PATCH v4] btrfs: Use larger zlib buffer for s390 hardware compression | From | Zaslonko Mikhail <> | Date | Wed, 15 Jan 2020 10:54:53 +0100 |
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Hello Andrew,
Could you please pick this V4 btrfs patch and the other five patches from V3 patch set (https://lkml.org/lkml/2020/1/3/568).
Older patches can be dropped from linux-next: * ac2aeaa0f4d3 btrfs: use larger zlib buffer for s390 hardware compression * ac19f15aea33 lib/zlib: add zlib_deflate_dfltcc_enabled() function * 3447c9a51196 s390/boot: add dfltcc= kernel command line parameter * 890060df4401 lib/zlib: add s390 hardware support for kernel zlib_inflate * 148f7d060405 s390/boot: rename HEAP_SIZE due to name collision * bfbef17740fd lib/zlib: add s390 hardware support for kernel zlib_deflate
Thanks, Mikhail.
-------- Forwarded Message -------- Subject: Re: [PATCH v4] btrfs: Use larger zlib buffer for s390 hardware compression Date: Tue, 14 Jan 2020 17:18:57 +0100 From: David Sterba <dsterba@suse.cz> Reply-To: dsterba@suse.cz To: Mikhail Zaslonko <zaslonko@linux.ibm.com> CC: Andrew Morton <akpm@linux-foundation.org>, Chris Mason <clm@fb.com>, Josef Bacik <josef@toxicpanda.com>, David Sterba <dsterba@suse.com>, Richard Purdie <rpurdie@rpsys.net>, Heiko Carstens <heiko.carstens@de.ibm.com>, Vasily Gorbik <gor@linux.ibm.com>, Christian Borntraeger <borntraeger@de.ibm.com>, Eduard Shishkin <edward6@linux.ibm.com>, Ilya Leoshkevich <iii@linux.ibm.com>, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org
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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