netdev - Re: Something hitting my total number of connections to the server

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Message-ID: <1503328678.2499.3.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Mon, 21 Aug 2017 08:17:58 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Akshat Kakkar <akshat.1984@...il.com>
Cc:     David Laight <David.Laight@...lab.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: Something hitting my total number of connections to the server

On Mon, 2017-08-21 at 15:26 +0530, Akshat Kakkar wrote:
> On Mon, Aug 21, 2017 at 3:13 PM, David Laight <David.Laight@...lab.com> wrote:
> > From: Akshat Kakkar
> >> Sent: 18 August 2017 10:14
> >> On Thu, Aug 17, 2017 at 5:06 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >> > On Thu, 2017-08-17 at 14:35 +0530, Akshat Kakkar wrote:
> >> >
> >> >> I upgraded to 4.4 but still experiencing same issue.
> >> >> Please help.
> >> >
> >> > Still too old kernel, shoot again ;)
> >> >
> >> >
> >>
> >>
> >> Sorry but that's the maximum I can try as of now as its the LT version.
> >
> > You should be able to build a current kernel and run it with your
> > existing user space.
> >
> >         David
> >
> 
> The issue is with tcp timestamp. When I am disabling it, things are
> working fine but when I enable the issue re-occurs. However, I am not
> seeing tcp timestamps on packet, even when it is enabled simply
> because my client doesn't support it.
> 
> But the question is, if I my client doesnt support timestamp , why
> enabling timestamp on server side is creating an issue??

Maybe you changed some sysctls wrongly ?