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SubjectRe: [PATCHv9 0/7] add compressing abstraction and multi stream support
Hello Sergey,

Sorry for the late.

Today, I tested this patch and confirm that it's really good.
I send result for the record.

In x86(4core and x2 hyper threading, i7, 2.8GHz), I did parallel 4 dd
test with 200m file like below

dd if=./test200m.file of=mnt/file1 bs=512k count=1024 oflag=direct &
dd if=./test200m.file of=mnt/file2 bs=512k count=1024 oflag=direct &
dd if=./test200m.file of=mnt/file3 bs=512k count=1024 oflag=direct &
dd if=./test200m.file of=mnt/file4 bs=512k count=1024 oflag=direct &
wait all backgroud job

The result is

When 1 max_comp_streams, elapsed time is 36.26s
When 8 max_comp_streams, elapsed time is 4.09s

In ARM(4core, ARMv7, 1.5GHz), I did iozone test.

1 max_comp_streams, 8 max_comp_streams
==Initial write ==Initial write
records: 10 records: 10
avg: 141964.05 avg: 239632.54
std: 3532.11 (2.49%) std: 43863.53 (18.30%)
max: 147900.45 max: 319046.62
min: 135363.73 min: 178929.40
==Rewrite ==Rewrite
records: 10 records: 10
avg: 144757.46 avg: 247410.80
std: 4019.19 (2.78%) std: 37378.42 (15.11%)
max: 150757.72 max: 293284.84
min: 135127.55 min: 188984.27
==Read ==Read
records: 10 records: 10
avg: 208325.22 avg: 202894.24
std: 57072.62 (27.40%) std: 41099.56 (20.26%)
max: 293428.96 max: 289581.12
min: 79445.37 min: 157478.27
==Re-read ==Re-read
records: 10 records: 10
avg: 204750.36 avg: 237406.96
std: 36959.99 (18.05%) std: 41518.36 (17.49%)
max: 268399.89 max: 286898.13
min: 154831.28 min: 160326.88
==Reverse Read ==Reverse Read
records: 10 records: 10
avg: 215043.10 avg: 208946.35
std: 31239.60 (14.53%) std: 38859.74 (18.60%)
max: 251564.57 max: 284481.31
min: 154719.20 min: 155024.33
==Stride read ==Stride read
records: 10 records: 10
avg: 227246.54 avg: 198925.10
std: 31105.89 (13.69%) std: 30721.86 (15.44%)
max: 290020.34 max: 227178.70
min: 157399.46 min: 153592.91
==Random read ==Random read
records: 10 records: 10
avg: 238239.81 avg: 216298.41
std: 37276.91 (15.65%) std: 38194.73 (17.66%)
max: 291416.20 max: 286345.37
min: 152734.23 min: 151871.52
==Mixed workload ==Mixed workload
records: 10 records: 10
avg: 208434.11 avg: 234355.66
std: 31385.40 (15.06%) std: 22064.02 (9.41%)
max: 253990.11 max: 270412.58
min: 162041.47 min: 186052.12
==Random write ==Random write
records: 10 records: 10
avg: 142172.54 avg: 290231.28
std: 6233.67 (4.38%) std: 46462.35 (16.01%)
max: 150652.40 max: 338096.54
min: 130584.14 min: 183253.25
==Pwrite ==Pwrite
records: 10 records: 10
avg: 141247.91 avg: 267085.70
std: 6756.08 (4.78%) std: 40019.39 (14.98%)
max: 150239.13 max: 335512.33
min: 130456.98 min: 180832.45
==Pread ==Pread
records: 10 records: 10
avg: 214990.26 avg: 208730.94
std: 40701.79 (18.93%) std: 50797.78 (24.34%)
max: 287060.54 max: 300675.25
min: 157642.17 min: 156763.98

So, all write test both x86 and ARM is really huge win
and I couldn't find any regression!

Thanks for nice work.

For all patchset,

Acked-by: Minchan Kim <minchan@kernel.org>

On Fri, Feb 28, 2014 at 08:52:00PM +0300, Sergey Senozhatsky wrote:
> This patchset introduces zcomp compression backend abstraction
> adding ability to support compression algorithms other than LZO;
> support for multi compression streams, making parallel compressions
> possible; adds support for LZ4 compression algorithm.
>
> v8->v9 (reviewed by Andrew Morton):
> -- add LZ4 backend (+iozone test vs LZO)
> -- merge patches 'zram: document max_comp_streams' and 'zram: add multi
> stream functionality'
> -- do not extern backend struct from source file
> -- use find()/release() naming instead of get()/put()
> -- minor code, commit messages and code comments `nitpicks'
> -- removed Acked-by Minchan Kim from first two patches, because I've
> changed them a bit.
>
> v7->v8 (reviewed by Minchan Kim):
> -- merge patches 'add multi stream functionality' and 'enable multi
> stream compression support in zram'
> -- return status code from set_max_streams knob and print message on
> error
> -- do not use atomic type for ->avail_strm
> -- return back: allocate by default only one stream for multi stream backend
> -- wake sleeping write in zcomp_strm_multi_put() only if we put stream
> to idle list
> -- minor code `nitpicks'
>
> v6->v7 (reviewed by Minchan Kim):
> -- enable multi and single stream support out of the box (drop
> ZRAM_MULTI_STREAM config option)
> -- add set_max_stream knob, so we can adjust max number of compression
> streams in runtime (for multi stream backend at the moment)
> -- minor code `nitpicks'
>
> v5->v6 (reviewed by Minchan Kim):
> -- handle single compression stream case separately, using mutex locking,
> to address perfomance regression
> -- handle multi compression stream using spin lock and wait_event()/wake_up()
> -- make multi compression stream support configurable (ZRAM_MULTI_STREAM
> config option)
>
> v4->v5 (reviewed by Minchan Kim):
> -- renamed zcomp buffer_lock; removed src len and dst len from
> compress() and decompress(); not using term `buffer' and
> `workmem' in code and documentation; define compress() and
> decompress() functions for LZO backend; not using goto's;
> do not put idle zcomp_strm to idle list tail.
>
> v3->v4 (reviewed by Minchan Kim):
> -- renamed compression backend and working memory structs as requested
> by Minchan Kim; fixed several issues noted by Minchan Kim.
>
> Sergey Senozhatsky (7):
> zram: introduce compressing backend abstraction
> zram: use zcomp compressing backends
> zram: factor out single stream compression
> zram: add multi stream functionality
> zram: add set_max_streams knob
> zram: make compression algorithm selection possible
> zram: add lz4 algorithm backend
>
> Documentation/ABI/testing/sysfs-block-zram | 17 +-
> Documentation/blockdev/zram.txt | 45 +++-
> drivers/block/zram/Kconfig | 10 +
> drivers/block/zram/Makefile | 4 +-
> drivers/block/zram/zcomp.c | 349 +++++++++++++++++++++++++++++
> drivers/block/zram/zcomp.h | 68 ++++++
> drivers/block/zram/zcomp_lz4.c | 47 ++++
> drivers/block/zram/zcomp_lz4.h | 17 ++
> drivers/block/zram/zcomp_lzo.c | 47 ++++
> drivers/block/zram/zcomp_lzo.h | 17 ++
> drivers/block/zram/zram_drv.c | 131 ++++++++---
> drivers/block/zram/zram_drv.h | 11 +-
> 12 files changed, 715 insertions(+), 48 deletions(-)
> create mode 100644 drivers/block/zram/zcomp.c
> create mode 100644 drivers/block/zram/zcomp.h
> create mode 100644 drivers/block/zram/zcomp_lz4.c
> create mode 100644 drivers/block/zram/zcomp_lz4.h
> create mode 100644 drivers/block/zram/zcomp_lzo.c
> create mode 100644 drivers/block/zram/zcomp_lzo.h
>
> --
> 1.9.0.359.g5e34a15
>
> --
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--
Kind regards,
Minchan Kim


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