Re: [tbench regression fixes]: digging out smelly deadmen.

Ilpo Järvinen
2008-10-31T11:02:27Z

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On Fri, 31 Oct 2008, Eric Dumazet wrote:

> David Miller a écrit :
> > From: "Ilpo Järvinen" <ilpo.jarvinen@helsinki.fi>
> > Date: Fri, 31 Oct 2008 11:40:16 +0200 (EET)
> >
> > > Let me remind that it is just a single process, so no ping-pong & other
> > > lock related cache effects should play any significant role here, no? (I'm
> > > no expert though :-)).
> >
> > Not locks or ping-pongs perhaps, I guess. So it just sends and
> > receives over a socket, implementing both ends of the communication
> > in the same process?
> >
> > If hash chain conflicts do happen for those 2 sockets, just traversing
> > the chain 2 entries deep could show up.
>
> tbench is very sensible to cache line ping-pongs (on SMP machines of course)

...Sorry to disappoint you but we were discussion there on my AIM9
tcp_test results :-).

--
i.