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

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Date:	Thu, 30 Oct 2008 19:43:32 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	Evgeniy Polyakov <zbr@...emap.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Evgeniy Polyakov <s0mbre@...rvice.net.ru>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	Mike Galbraith <efault@....de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [tbench regression fixes]: digging out smelly deadmen.

Stephen Hemminger a écrit :
> Has anyone looked into the impact of port randomization on this benchmark.
> If it is generating lots of sockets quickly there could be an impact:
>   * port randomization causes available port space to get filled non-uniformly
>     and what was once a linear scan may have to walk over existing ports.
>     (This could be improved by a hint bitmap)
> 
>   * port randomization adds at least one modulus operation per socket
>     creation. This could be optimized by using a loop instead.



tbench setups one socket per client, then send/receive lot of messages on this socket.

Connection setup time can be ignored for the tbench regression analysis


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