netdev - Re: [PATCH v3] rps: optimize rps_get

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:	Sun, 25 Apr 2010 00:19:27 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	hadi@...erus.ca
Cc:	David Miller <davem@...emloft.net>,
	Tom Herbert <therbert@...gle.com>,
	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v3] rps: optimize rps_get_cpu()

On Sun, Apr 25, 2010 at 12:04 AM, jamal <hadi@...erus.ca> wrote:
>
> By the time you hit this code (at least on machines that make sense for
> RPS), you already have the ethernet header, IP header and transport
> ports in cache, no?
> I think the sport << 16 shifting is avoided - but i dont think theres
> any effect on mem access.

Maybe I have used the wrong word. Sorry. If the ports are already in
cache, the new code has only one cache access for ports, and the later
operations are in registers.


-- 
Regards，
Changli Gao(xiaosuo@...il.com)
--
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