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Message-ID: <5838205f-41ba-4666-9786-11181552a738@intel.com>
Date: Fri, 12 Jan 2024 19:28:17 +0800
From: "Yin, Fengwei" <fengwei.yin@...el.com>
To: kernel test robot <oliver.sang@...el.com>, wangkeqi
<wangkeqiwang@...iglobal.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
<ying.huang@...el.com>, <feng.tang@...el.com>
Subject: Re: [linus:master] [connector] c46bfba133:
stress-ng.netlink-proc.ops_per_sec -97.2% regression
On 1/11/2024 11:19 PM, kernel test robot wrote:
>
>
> Hello,
>
> we reviewed this report and Fengwei (Cced) pointed out it could be the patch
> breaks functionality, then causes stress-ng netlink-proc performance drops
> dramatically.
>
Just FYI. Here is what I observed when running
stress-ng.netlink-proc testing:
Whatever with/without the patch, cn_netlink_send_mult() returns
-ESRCH in most case.
The following is what the cn_netlink_send_mult() returns when
stress-ng.netlink-proc is running:
...
213801 213801 stress-ng-3 cn_netlink_send_mult -3
213801 213801 stress-ng-spawn cn_netlink_send_mult -3
213801 213801 stress-ng-spawn cn_netlink_send_mult -3
213801 213801 stress-ng-wait cn_netlink_send_mult -3
213802 213802 stress-ng-4 cn_netlink_send_mult -3
213802 213802 stress-ng-spawn cn_netlink_send_mult -3
213802 213802 stress-ng-spawn cn_netlink_send_mult -3
213802 213802 stress-ng-wait cn_netlink_send_mult -3
213803 213803 stress-ng-5 cn_netlink_send_mult -3
213803 213803 stress-ng-dead cn_netlink_send_mult -3
213803 213803 stress-ng-dead cn_netlink_send_mult -3
213802 213802 stress-ng-wait cn_netlink_send_mult -3
213801 213801 stress-ng-wait cn_netlink_send_mult -3
213800 213800 stress-ng-wait cn_netlink_send_mult -3
213799 213799 stress-ng-wait cn_netlink_send_mult -3
213798 213798 stress-ng-wait cn_netlink_send_mult -3
154697 154697 stress-ng cn_netlink_send_mult -3
...
Looks like it's not accurate to reset proc_event_num_listeners
according to cn_netlink_send_mult() return value -3.
Regards
Yin, Fengwei
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