This patch fixes the problem:
>From 57ca81245f4db4a0222d545f8f5d4709544c26cf Mon Sep 17 00:00:00 2001
From: Shukun Tan <tanshuk...@huawei.com>
Date: Thu, 5 Mar 2020 10:06:21 +0800
Subject: [PATCH] crypto: hisilicon - Use one workqueue per qm instead of per
qp
Since SEC need not so many workqueues as our test, we just use
one workqueue created by the device driver of QM if necessary,
which will also reduce CPU waste without any throughput decreasing.
Signed-off-by: Shukun Tan <tanshuk...@huawei.com>
Signed-off-by: Zaibo Xu <xuza...@huawei.com>
Reviewed-by: Jonathan Cameron <jonathan.came...@huawei.com>
Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au>
** Changed in: linux (Ubuntu Hirsute)
Status: New => Invalid
** Changed in: linux (Ubuntu Impish)
Status: New => Invalid
** Changed in: linux (Ubuntu Focal)
Status: Confirmed => Triaged
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https://bugs.launchpad.net/bugs/1932117
Title:
Lots of hisi_qm zombie task slow down system after stress test
Status in kunpeng920:
New
Status in kunpeng920 ubuntu-18.04-hwe series:
New
Status in kunpeng920 ubuntu-20.04 series:
New
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Focal:
Triaged
Status in linux source package in Hirsute:
Invalid
Status in linux source package in Impish:
Invalid
Bug description:
[Bug Description]
With focal 5.4 kernel, crypto driver does not clean up its created process
when calculation is done. Many zombie processes slow down system. e.g. Takes
more then 10sec for ssh connection.
[Steps to Reproduce]
1) Install Ubuntu 20.04 with GA (5.4) kernel
2) sudo apt install -y stress-ng
3) stress-ng --aggressive --verify --timeout 300 --metrics-brief --tz --times
--af-alg 0
4) ps aux | grep hisi_qm | wc -l
[Actual Results]
>100000
[Expected Results]
<100
[Reproducibility]
100%
[Additional information]
Can not reproduce with focal HWE (5.8) kernel.
[Resolution]
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