Re: TCPBacklogDrops during aggressive bursts of traffic

Eric Dumazet
2012-05-18T15:49:45Z

On Fri, 2012-05-18 at 16:45 +0100, Kieran Mansley wrote:
> On Thu, 2012-05-17 at 18:37 +0200, Eric Dumazet wrote:
> >
> > Hmm, I was not suggesting running production servers with this
> > setting, only do an experiment.
>
> OK. I've found a more reliable way to reproduce it (use MSG_WAITALL to
> make the recv call wait till the socket buffer will be more full) and
> tried with the tcp_adv_win_scale to -2. It's hard to make any confident
> assertions about the impact of it, but if it does change the behaviour
> it is a small change. There are certainly still plenty of drops with
> that setting.

Are you playing with SO_RCVBUF, or let the stack autotune it ?