netdev - Re: Urgent Bug report: PPPoE ioctl(PPPIOCCONNECT): Transport endpoint is not connected

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Date:   Wed, 11 Aug 2021 18:48:35 +0200
From:   Guillaume Nault <gnault@...hat.com>
To:     Martin Zaharinov <micron10@...il.com>
Cc:     Pali Rohár <pali@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: Urgent  Bug report: PPPoE ioctl(PPPIOCCONNECT): Transport
 endpoint is not connected

On Wed, Aug 11, 2021 at 02:10:32PM +0300, Martin Zaharinov wrote:
> And one more that see.
> 
> Problem is come when accel start finishing sessions,
> Now in server have 2k users and restart on one of vlans 3 Olt with 400 users and affect other vlans ,
> And problem is start when start destroying dead sessions from vlan with 3 Olt and this affect all other vlans.
> May be kernel destroy old session slow and entrained other users by locking other sessions.
> is there a way to speed up the closing of stopped/dead sessions.

What are the CPU stats when that happen? Is it users space or kernel
space that keeps it busy?

One easy way to check is to run "mpstat 1" for a few seconds when the
problem occurs.