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

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Message-ID: <20081030111526.7d9bb0f8@extreme>
Date:	Thu, 30 Oct 2008 11:15:26 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Evgeniy Polyakov <zbr@...emap.net>
Cc:	"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.

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.
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