netdev - RE: [Bug 206919] New: Very bad performance of sendto function

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Date:   Wed, 25 Mar 2020 17:13:32 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Stephen Hemminger' <stephen@...workplumber.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [Bug 206919] New: Very bad performance of sendto function

From: Stephen Hemminger
> Sent: 23 March 2020 16:59
> To: netdev@...r.kernel.org
> Subject: Fw: [Bug 206919] New: Very bad performance of sendto function
> 
> There maybe something here but probably not.

They need to raise it with wine.

They don't even say what sort of message rate they are getting
(or trying to get).

	David

> Begin forwarded message:
> 
> Date: Sun, 22 Mar 2020 11:22:46 +0000
> From: bugzilla-daemon@...zilla.kernel.org
> To: stephen@...workplumber.org
> Subject: [Bug 206919] New: Very bad performance of sendto function
> 
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=206919
> 
>             Bug ID: 206919
>            Summary: Very bad performance of sendto function
>            Product: Networking
>            Version: 2.5
>     Kernel Version: 5.4.13
>           Hardware: All
>                 OS: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Other
>           Assignee: stephen@...workplumber.org
>           Reporter: bernat.arlandis@...il.com
>         Regression: No
> 
> Created attachment 288007
>   --> https://bugzilla.kernel.org/attachment.cgi?id=288007&action=edit
> Sysprof capture file
> 
> Hi,
> 
> I have a case where the sendto function is slowing down the software I'm trying
> to use. Sysprof capture file attached.
> 
> It's probably being called at a high frequency and the __netlink_dump_start
> function spends a lot of time in the mutex lock, then also in the netlink_dump
> call.
> 
> This is causing the threads calling the function to stall. At least this is my
> interpretation of the profiling session.
> 
> I don't have any knowledge about the way networking code works. I'd like to
> know if the flaw is in the user-space software or in the kernel. Can I provide
> any more info or do some test to help determine what's happening? I'd like to
> help fix it.
> 
> My NIC: Intel Corporation I211 Gigabit Network Connection (rev 03)
> 
> My system: Debian 10 with kernel 5.4.13.
> 
> Thanks.
> 
> --
> You are receiving this mail because:
> You are the assignee for the bug.

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