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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20081030184024.GA6314@ioremap.net>
Date:	Thu, 30 Oct 2008 21:40:24 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Stephen Hemminger <shemminger@...tta.com>
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.

On Thu, Oct 30, 2008 at 11:15:26AM -0700, Stephen Hemminger (shemminger@...tta.com) wrote:
> 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.

In this benchmark only two sockets are created per client for the whole
run, so this should not have any impact on performance.

-- 
	Evgeniy Polyakov
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/