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

Eric Dumazet
2008-10-31T11:11:23Z

Ilpo Järvinen a écrit :
> 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 :-).
>

Well, before you added AIM9 on this topic, we were focusing on tbench :)

Sorry to disappoint you :)