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]
Date:	Mon, 17 Mar 2014 15:43:23 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Eric Dumazet' <eric.dumazet@...il.com>
CC:	Thomas Graf <tgraf@...g.ch>, David Miller <davem@...emloft.net>,
	"John Fastabend" <john.fastabend@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next] net: sched: use no more than one page in
 struct fw_head

From: Eric Dumazet ...
> > or use a 'modulo 2^n-1 reduction':
> > 	handle = (handle & 0x3ffff) + (handle >> 18);
> > 	do
> > 		handle = (handle & 0x1ff) + (handle >> 9);
> > 	while (handle > 0x1ffu);
> 
> All these tricks were needed 20 years ago.
> 
> Even Thomas laptop can do a divide faster than this loop.

The nios cpu on my fpga can't :-)
OTOH I wouldn't run Linux on a 100Mhz cpu.

	David


Powered by blists - more mailing lists