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:	Thu, 5 Nov 2009 16:16:23 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Octavian Purdila <opurdila@...acom.com>,
	Lucian Adrian Grijincu <lgrijincu@...acom.com>,
	netdev@...r.kernel.org
Subject: Re: [RFC] [PATCH] udp: optimize lookup of UDP sockets to by including destination address in the hash key

On Thu, Nov 05, 2009 at 04:07:25PM +0100, Eric Dumazet wrote:
> Andi Kleen a écrit :
> >> I assume cache is cold or even on other cpu (worst case), dealing with
> >> 100.000+ sockets or so...
> > 
> > Other CPU cache hit is actually typically significantly 
> > faster than a DRAM access (unless you're talking about a very large NUMA 
> > system and a remote CPU far away)
> 
> Even if data is dirty in remote CPU cache ? 

Some cache protocols have to force dirty data through DRAM, but modern
ones usually do not.

-Andi
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists