[PATCH v9] erofs: support deflate decompress by using Intel QAT

[Gao Xiang]

On 2025/5/22 17:49, Bo Liu wrote:
> This patch introdueces the use of the Intel QAT to decompress compressed
> data in the EROFS filesystem, aiming to improve the decompression speed
> of compressed datea.
> 
> We created a 285MiB compressed file and then used the following command to
> create EROFS images with different cluster size.
>       # mkfs.erofs -zdeflate,level=9 -C16384
> 
> fio command was used to test random read and small random read(~5%) and
> sequential read performance.
>       # fio -filename=testfile  -bs=4k -rw=read -name=job1
>       # fio -filename=testfile  -bs=4k -rw=randread -name=job1
>       # fio -filename=testfile  -bs=4k -rw=randread --io_size=14m -name=job1
> 
> Here are some performance numbers for reference:
> 
> Processors: Intel(R) Xeon(R) 6766E(144 core)
> Memory:     521 GiB
> 
> |-----------------------------------------------------------------------------|
> |           | Cluster size | sequential read | randread  | small randread(5%) |
> |-----------|--------------|-----------------|-----------|--------------------|
> | Intel QAT |    4096      |    538  MiB/s   | 112 MiB/s |     20.76 MiB/s    |
> | Intel QAT |    16384     |    699  MiB/s   | 158 MiB/s |     21.02 MiB/s    |
> | Intel QAT |    65536     |    917  MiB/s   | 278 MiB/s |     20.90 MiB/s    |
> | Intel QAT |    131072    |    1056 MiB/s   | 351 MiB/s |     23.36 MiB/s    |
> | Intel QAT |    262144    |    1145 MiB/s   | 431 MiB/s |     26.66 MiB/s    |
> | deflate   |    4096      |    499  MiB/s   | 108 MiB/s |     21.50 MiB/s    |
> | deflate   |    16384     |    422  MiB/s   | 125 MiB/s |     18.94 MiB/s    |
> | deflate   |    65536     |    452  MiB/s   | 159 MiB/s |     13.02 MiB/s    |
> | deflate   |    131072    |    452  MiB/s   | 177 MiB/s |     11.44 MiB/s    |
> | deflate   |    262144    |    466  MiB/s   | 194 MiB/s |     10.60 MiB/s    |
> 
> Signed-off-by: Bo Liu <liubo03 at inspur.com>
Reviewed-by: Gao Xiang <hsiangkao at linux.alibaba.com>

Thanks,
Gao Xiang