linux-kernel - Re: [PATCH v5] erofs: add per-cpu threads for decompression as an option

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Message-ID: <CAB=BE-Svf7TMPs-eA+sVuGtYjVWfKd1Nd_AkA9im4Op7TCLW3g@mail.gmail.com>
Date:   Mon, 27 Feb 2023 20:47:48 -0800
From:   Sandeep Dhavale <dhavale@...gle.com>
To:     Gao Xiang <hsiangkao@...ux.alibaba.com>
Cc:     Eric Biggers <ebiggers@...nel.org>, linux-erofs@...ts.ozlabs.org,
        LKML <linux-kernel@...r.kernel.org>,
        Nathan Huckleberry <nhuck@...gle.com>,
        Yue Hu <huyue2@...lpad.com>, kernel-team@...roid.com
Subject: Re: [PATCH v5] erofs: add per-cpu threads for decompression as an option

Hi all,
I completed the tests and the results are consistent with
our previous observation. We can see that removing WQ_UNBOUND
helps but the scheduling latency by using high priority per cpu
kthreads is even lower. Below is the table.

|---------------------+-------+-------+------+-------|
| Table               | avg   | med   | min  | max   |
|---------------------+-------+-------+------+-------|
| Default erofs       | 19323 | 19758 | 3986 | 35051 |
|---------------------+-------+-------+------+-------|
| !WQ_UNBOUND         | 11202 | 10798 | 3493 | 19822 |
|---------------------+-------+-------+------+-------|
| hipri pcpu kthreads | 7182  | 7017  | 2463 | 12300 |
|---------------------+-------+-------+------+-------|


Thanks,
Sandeep.